ML20072A476
| ML20072A476 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, 05000000 |
| Issue date: | 05/09/1983 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20072A464 | List: |
| References | |
| REF-SSINS-6820 0050C, 0051C, 0052C, 50C, 51C, 52C, IEB-80-11, NUDOCS 8306100156 | |
| Download: ML20072A476 (129) | |
Text
{{#Wiki_filter:_________ 180-DAY REPORT IN RESPONSE TO IE BULLETIN 80-11 FOR DRESDEN NUCLEAR POWER STATION UNITS 2 AND 3 COMMONWEALTH EDISON COMPANY DOCKET NUMBERS 50-237 AND 50-249 PREPARED BY: Bechtel Power Corporation Report Date: May 9, 1983 Revision 3 0050C pygdPf#c2$1 0
TABLE OF CONTENTS Paae k,
1.0 INTRODUCTION
1 2.0 SCOPE 1
3.0 DESCRIPTION
OF MASONRY WALLS 1 3.1 LOCATION 1 3.2 FUNCTION 1 3.3 WALL CONFIGURATION 2 3.4 CONSTRUCTION MATERIALS 2 3.5 CONSTRUCTION PRACTICES 3 3.6 RECONCI,LIATION WITH 180-DAY REPORT, 3 g REVISION 2 4.0 REEVALUATION OF MASONRY WALLS 4 4.1 POSTULATED LOADS 4 4.2 ALLOWABLE STRESSES 6 4.3 JUSTIFICATION OF THE REEVALUATION CRITERIA 6 4.4 SEQUENCE OF ANALYSIS 7 4.5 METHOD OF ANALYSIS AND ACCEPTANCE CRITERIA 7 4.6 ASSUMPTIONS AND ANALYSIS CONSTRAINTS 8 4.7 MASONRY WALL TESTING PROGRAM 10 5.0 RESULTS OF MASONRY WALL EVALUATION 10 5.1
SUMMARY
11
6.0 REFERENCES
11 APPENDIXES A Masonry Wall Plans B Additional Justification of the Reevaluation Criteria TABLES 1 Masonry Walls -Function and Physical Properties 2 Allowable Stresses in Concrete Masonry Walls 3 Applied Loads and Evaluation Results 11 0050C
l.0 INTRODUCTION This 180-day report is being issued in response to NRC IE
-s Bulletin 80-11, dated May 8, 1980 (Reference 6.2). This report has been-prepared by Bechtel Power Corporation, Ann Arbor, Michigan, for Commonwealth Edison Company's Dresden Nuclear
-Power Station.-Units 2 and 3. Revision 3 of this report incorporates the design criteria developments that have occurred ghg subsequent to the previous revision. Therefore, this report is intended to finalize the response to the above bulletin.
2.0 SCOPE The 180-day report furnishes information requested.in Item 2b of NRC IE Bulletin 80-11. It deals solely with masonry walls identified in this report as safety-related. Any masonry wall is considered safety-related when it is in proximity to or has attachments from safety-related piping or equipment such that - wall failure could damage a safety-related system. The analyses are based on as-built conditions identified during site surveys of June and July 1980 and July 1981.
3.0 DESCRIPTION
OF MASONRY WALLS 3.1 LOCATION The figures in Appendix A show the location of all safety-related masonry walls. () 3.2 FUNCTION The function of each masonry wall is identified in Table 1 according to one of the following categories. i 3.2.1 Fire Wall These walls were constructed to prevent the spread of fire from , one side of the wall to the other according to the appropriate l fire rating associated with the wall's thickness. l 3.2.2 Partition Wall The partition walls are interior dividing walls whose sole purpose is to separate a portion of a room from the remainder. 3.2.3 Shieldino Wall The masonry shielding walls, typically made of solid units which j are required to restrict radiation exposures. 1 I 0050C I
l l 3.2.4 Blockout { A blockout, made of masonry, seals an opening in a larger
/"% concrete wall. These openings are left in the concrete walls to
\m/ provide for equipment installation or pipe penetrations before the opening is sealed with the masonry.
, 3.2.5 Exterior Wall l Exterior walls have at least a part of one face exposed to the outside, or are a part of the boundary of the Units 2 and 3 reactor turbine building complex. Only. exterior walls are subject to wind or tornado loads. 3.3 WALL CONFIGURATION Wall dimensions and boundary conditions for each wall are indicated in Table 1. Each boundary is categorized as either a fixed support capable of providing both moment and shear resistance, a simple support resisting only shear forces, or a free edge through which no forces can be transferred. 3.4 CONSTRUCTION MATERIALS 3.4.1 Hollow Masonry The hollow masonry units, which are identified on the design drawings, were specified as three-core blocks conforming to ASTM C 90, Grade N-I, Lightweight Aggregate. Masonry walls, O which are not shown on the design drawings, were assumed to concist of hollow units of the same type specified above. This assumption and the material properties of the hollow block were verified by plant-specific tests (see Section 4.7). Site surveys have found that the hollow masonry walls consist of both two-core and three-core units. Solid Masonry \ 3.4.2 Two types of solid blocks (normal weight and magnetite) were used in the solid masonry construction. Plant-specific tests ! determined the material properties of both types of block (see section 4.7). 3.4.3 Mortar l The mortar used in the construction of the hollow masonry walls was specified as ASTM C 270, Type N, with a 28-day compressive strength of 750 psi. Tests on the mortar used in the solid masonry found that it was, as a minimum, comparable to that specified for hollow masonry (see Section 4.7). O 0050C 2
3.4.4 Reinforcina Staal According to the. design drawings and specifications, the masonry S walls are reinforced in the bed joint of every other course.
/ This joint reinforcement consists of heavy-duty, continuous, rectangular, ladder type steel reinforcement, whose minimum yield strength is 65 ksi. Deformed bar steel, where shown on the drawings, has a minimum yield strength of 40 ksi.
3.4.5 Anchors Masonry anchors have been used in certain. locations to tie the masonry wall to an adjacent structural element. These anchors consist of two types: corrugated metal ties (dovetail anchors) which are used for connections to concrete walls or columns and t 3/16-inch diameter adjustable bar ties welded to the supporting l structural steel. 3.5 CONSTRUCTION PRACTICES The masonry walls at the station were constructed in accordance with the applicable job and standard specifications for masonry work and have a high quality of masonry workmanship. Conformance to applicable ASTM specifications was required for concrete blocks, mortar, reinforcing ties, and anchors. Storage and protection of blocks and walls, as well as cold weather protection, were specified. The mortar joints of solid masonry walls were required to be constructed with full mortar coverage on all vertical and horizontal faces. The vertical joints were to be shoved tight. A full mortar bedding was specified for webs and face shells of the hollow masonry walls. Face shells were required to be fully buttered and pressed into place to ensure full, well-compacted horizontal and vertical mortar joints. 3.6 RECONCILIATION WITH 180-DAY REPORT, REVISION 2 This latest revision of the 180-day report incorporates the
-following information:
3.6.1 The results of the site-specific sampling and testing program (see Section 4.7) 3.6.2 The exclusion of tornado missile inpact on two masonry
'b walls (see Subsection 4.1.5) 3.6.3 The consideration of a leak before break concept in addressing the impact of a high-energy pipe break (see Subsection 4.1.9) 0050C
3.6.4 Four additional safety-rolated masonry walls ware discovered in the area of the reactor water cleanup system (RWCS) (see Appendix A, Page 2). These walls, r- numbered 35, 36, 37, and 39, are described in Table 1, (m)s and the applied loads and evaluation results are given fhi in Table 3. With the incorporation of the above, a total of 66 masonry walls now meet the acceptance criteria. This represents an increase of eight walls over the total shown in Revision 2 of this report. 4.0 REEVALUATION OF MASONRY WALLS 4.1 POSTULATED LOADS The loads which were considered in the eval'uation of each wall are identified in Table 3. 4.1.1 Dead Load (D) This load includes the dead weight of the wall and all permanently attached equipment, piping, conduit, and cable trays. The construction sequences have allowed the permanent dead load deflection to occur prior to the erection of the masonry walls. Therefore, the dead loads from the floor above are not transferred to the masonry walls. 4.1.2 Live Load (L) ('g This load includes applicable live loads which can be V transferred to the masonry wall through the floor framing. The live loads are not considered in those load combinations when they would relieve wall stresses. 4.1.3 Attachment Loads (Ro and Ra) The attachment loads are localized loads which are a result of the reactions from the supports of piping, cable trays, conduits, HVAC ducts, and other systems. The reactions are determined for the normal operating or shutdown condition (Ro) and for the accident condition (Ra) which results from the thermal conditions generated by the postulated pipe break and includes R o. 4.1.4 Wind Load (W) Exterior walls are subject to a uniform pressure load corresponding to the design wind speed. The design wind speed for Dresden Units 2 and 3 is 110 miles per hour. 0050C
4.1.5 Tornado Load (Wt ) Exterior walls are subject to velocity pressures, differential pressures, and tornado missiles of the design tornado identified O in the plant FSAR. The maximum tornado wind speed is 300 miles per hour. The maximum differential pressure is 170 psf. The following missiles are generated by the design tornado:
- a. A telephone pole 35'-O" long, with a butt diameter of 13 inches, a unit weight of 50 pcf. and total weight of 1.200 pounds, and having a velocity of 150 miles per hour
- b. A 1-ton mass with a velocity of 100 miles per hour and a contact ar_ea of 25 square feet A probabilistic risk assessment for tornado missiles impacting walls D2-529-43C-74 and D2-517-31G-105 was performed by others.
The results of this analysis show the probability of a tornado jQg missile striking either of these two walls to be approximately 10-7 per year. Therefore, the evaluation includes only the effects of wind pressure and depressurization. The original design considered the buildings housing safety-related piping, conduit, cable trays, and equipnent as sealed; therefore, tornado loadings do not affect interior walls. 4.1.6 Operatino Basis Earthquake (Eo) This load represents the seismic load generated by the operating basis earthquake (OBE). The design ground accelerations are as follows:
- a. Horizontal = 0.1 g
- b. Vertical = 0.067 g 4.1.7 Safe Shutdown Earthquake (Es)
This load re c T!;e nts the seismic load generated by the safe shutdown er tic-daXe (SSE). The design ground accelerations are twice th'1 cr vn for the OBE. 4.1.8 Thet;41_ Loads (To and Ta) Thermal loads account for the effects of thermal gradients under normal operating (T o) and accident (T a) conditions. The operating loads represent the most critical steady-state condition, while the accident condition is a short-term thermal transient resulting from the postulated pipe leak, including ./)g To. 0050C
4.1.9 Hich-En9 rov Pion Break ! The high-energy piping systems outside of the primary containment were investigated and their proximity to the O safety-related masonry walls was established. It was found that only a break in the RWCS would impact the masonry walls. However, a break in this system is precluded by means of leak detection and administrative action. Room temperature monitors are capable of responding to small RWCS leaks by providing indication and alarm to the control room. At this time, the g operators shall take the appropriate action to isolate the RWCS, thereby preventing a full pipe rupture. ' The analysis of the masonry walls in proximity to the RWCS addresses the effects of the postulated pipe leak by considering the thermal transient discussed in Subsection 4.1.8 and ! differential pressure (Pa). This load is represented by an i equivalent static pressute across a. wall. 4.2 ALLOWABLE STRESSES The allowable masonry stresses, excluding collar joint stresses, e under' normal load combinations are in accordance with those given by the Building Code Requirements for Concrete Masonry Structures (ACI 531-79)(Reference 6.1). Allowable stresses for extreme environmental and abnormal load combinations are increased by a factor of 1.67 over the above ACI code allowable stresses. , For the mortar collar joints, the allowable shear and tension stresses are 10 psi for normal load combinations and 14 psi for g extreme environmental and abnormal load combinations. A11cwable stresses applicable to the different types of masonry are given in Table 2. . 4.3 JUSTIFICATION OF THE REEVALUATION CRITERIA j Except as noted, allowable stresses of masonry units and mortar are based on the code values as published in ACI 531-79. These values are considered reasonable and conservative. References to tests and other codes are provided in the commentary to ACI 531-79. It is noted that the allowable stresses are used for the evaluation of existing masonry walls and not for the design of new walls. 3 Because building codes do not address abnormal and extreme
, environmental conditions, a factor of 1.67 was used to provide L allowable stresses under these loading combinations. Based on available margins of safety, this factor is considered to be reasonable.
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1 Publichsd data on tension and shear strength of collar joints are almost nonexistent. The ultimate collar joint stresses were therefore determined by plant-specific in situ tests. The allowable stress, as given in Section 4.2, was obtained by g 0s applying a safety margin of three to the minimum test result (see Section 4.7). Additional justification of the reevaluation criteria is provided in Appendix B. 4.4 SEQUENCE OF ANALYSIS Each wall is initially analyzed considering only dead and seismic loads or dead and tornado loads, whichever appears most critical. For all walls which are found to be acceptable, the following applicable loadings are considered: live load, attachment loads, pipe leak loads, and interstory drift. jpg 4.6 METHOD OF ANALYSIS AND ACCEPTANCd CRITERIA 4.5.1 Stress Analysis Based on the walls' boundary conditions, each wall is idealized as either a cantilever, one-way strip, or two-way plate which is supported along at least two adjacent edges. The wall is then considered acceptable if all wall strecses under all load combinations are less than or equal to the established allowable stresses. 4.5.2 Stability and Sliding Analysis
> )
Cantilever walls which do not meet the acceptance criteria for allowable stresses are analyzed with regard to overturning stability and sliding movement. A factor of safety against gp overturning is determined for both OBE and SSE loads. The minimum acceptable factors of safety are 2.0 for OBE and 1.5 for SSE conditions. Before the wall is considered acceptable, the total wall movement, including rocking and sliding, must not adversely affect any safety-related items. 4.5.3 Analysis of Arching Effects Masonry walls with mortared joints at both the top and bottom boundaries that do not meet the acceptance criteria for allowable stresses are investigated for arching effects. The wall's capability of resisting horizontal loads, after ultimate tension stresses are exceeded, is developed when the wall jams at the top and bottom against the supporting structural members. The center of the wall cracks due to tension stresses, and a three-hinged arch is formed to resist the loads through compression stresses only. 0050C
3 D2cign seismic loads generated by the safe shutdown earthquake are based on the peak acceleration of the applicable response criteria and a damping factor of 10% of critical. O) ( The stiffnesses of the supporting structural elements are accounted for in the analysis. Also, the deflection at the center hinge must be less than or equal to one third of the wall thickness. If an arching wall meets the above requirement, it is considered acceptable when the compression stress developed in the arch is less than or equal to the allowable flexural compression stress shown in Table 2. 4.5.4 Interstory Drift Under Seismic Loads The effects of interstory drift are considered by determining the in-plane shear strain in the wall due to the relative displacement between the top and bottom of the wall. The allowable in-plane strains are 0.0001 for unconfined walls and 0.001 for confined walls. An unconfined wall is defined as a wall supported only on two adjacent sides. A confined wall is supported on any three sides or at the top and bottom of the wall (References 6.5, 6.6, and 6.7). These acceptance criteria are considered to be justified because none of the masonry walls carry a significant part of the buildings' story shear or moment. Also, test data indicate that the gross shear strain of walls is a more reliable indicator for predicting the onset of cracking than loads or stresses. The out-of-plane relative displacement creates a bending moment g-)3
\_ in the wall only in the case where the top and bottom boundaries are supported, and at least one represents a fixed condition.
None of the masonry walls at the Dresden station are effectively fixed at either the top or the bottom boundary; therefore, the out-of-plane interstory drift is not considered. 4.6 ASSUMPTIONS AND ANALYSIS CONSTRAINTS The following assumptions and constraints were employed in the reevaluation of the masonry walls. 4.6.1 Nonsafety-related walls, anchor bolts, and embedments were not within the scope of the reevaluation. 4.6.2 All loads and load combinations outlined in the plant i FSAR are considered in the reevaluation. t l l l g 8 y 0050C
A 4.6.3 The seismic loads on masonry walls are dependant on the f damping characteristics of the material, which are expressed in percentage of critical damping as follows (References 6.3 and 6.4):
- a. Uncracked Masonry. Wall, Out-of-Plane Acceleration
- 1) OBE: 2%
- 2) SSE: 2%
- b. Vital P-iping Systems, Horizontal and Vertical Accelerations
- 1) OBE: 0.5%
- 2) SSE: 2%
The plant FSAR specifies damping of 0.5% under OBE conditions for vital piping systems. For the purpose of this evaluation, vital piping are defined as all safety-related piping.
- c. Other Attached Systems, Horizontal and Vertical Accelerations
- 1) OBE: 1%
- 2) SSE: 2%
This category includes nonsafety-related piping and safety-related and nonsafety-related conduit, cable trays, and HVAC ductwork. 4.6.4 A masonry wall is considered an isotropic, elastic material. Its natural frequency is calculated using standard plate formulas. For a wall with an opening, the calculated frequency is reduced by 9% if the size of the opening equals or is greater than 15% of the wall area. The reduction is proportionally less for a smaller opening. For multiple openings, the largest one is considered. To account for variation in stiffness and mass of the wall, the above frequency is varied by 1 10% and the maximum response is used in the analysis. 4.6.5 In accordance with the plant FSAR, the effects of the seismic loads of one horizontal and the vertical direction are added arithmetically. 4.6.6 Dead loads from the floor above are not considered . being transferred to the masonry walls. A part of the live load from these floors is transferred to the walls however, it is not considered if it will relieve wall stresses. 0050C ,
4.6.7 Shear and tensile stresses are not transferred across the continuous vertical mortar joints of walls laid in stack bond or the vertical mortar joints of a wall , boundary adjacent to a concrete structural member. 4.6.8 Standard, prefabricated sections of the horizontal joint reinforcing steel are provided at all corners of masonry walls. However, their contribution to the strength capacity of this intersection is not considered. 4.7 MASONRY WALL TESTING PROGRAM A sampling and testing program was performed at the station. This program provided the material properties necessary to determine the allowable stresses applicable for the masonry wall evaluations. The testing was also considered to fulfill the special inspection requirements of Reference 6.1; thus allowing the use of inspected allowable stresses. The findings of the program are as follows. 4.7.1 The hollow masonry block has an average compressive strength of 2,100 psi on the net area. 4.7.2 The solid masonry block has an average compressive strength of 3,400 psi. 4.7.3 The mortar used in both the hollow and solid masonry construction is, as a minimum, comparable to ASTM C 270, Type N. 4.7.4 The average unit weight of the hollow masonry is 110 pcf and the average unit weight for the solid masonry is 132 pcf. , 4.7.5 In situ tests were performed on two walls to determine the strength of the mortared collar joint. The resulting failure stresses were 37.6 and 32.7 psi. 4.7.6 One wall (D2-534-33G-21) was found to consist of ! magnetite aggregate. Tests indicate the block of this l wall to have a compressive strength of 6,000 psi and a l unit weight of 235 pcf. The mortar was found to be comparable to ASTM C 270 Type M. 5.0 RESULTS OF MASONRY WALL EVALUATION Table 3 lists the results of the masonry wall reevaluation. The l criteria used to justify the wall's acceptance or mode in which j it does not meet the criteria are identified. i 10 O' 0050C f I L
5.1
SUMMARY
The following summarizes the results of the reevaluation of 96 safety-related masonry walls: 5.1.1 Total number of walls meeting the acceptance criteria: di 66 5.1.2 Total number of walls which do not meet the acceptance criteria: 30
6.0 REFERENCES
6.1 Building Code Requirements for Concrete Masonry Structures, ACI 531-79, American Concrete Institute. Detroit, Michigan, 1979 6.2 USNRC IE Bulletin 80-11, dated May 8, 1980 6.3 Final Safety Analysis Report (FSAR) for the Dresden Nuclear Power Station Units 2 and 3 6.4 Damping Values for Seismic Design of Nuclear Power Plants, U.S. Nuclear Regulatory Commission Regulatory Guide 1.61, October 1973 6.5 Becica, I.J. and H.G. Harris, Evaluation of Techniques in the Direct Modeling of Concrete Masonry Structures, Drexel University Structural Models Laboratory Report M77-1, June 1977 6.6 Fishburn, C.C., Effect of Mortar Properties on Strength of Masonry, National Bureau of Standards Monograph 36 U.S. Government Printing Office November 1961 6.7 Mayes, R.L.; Clough, R.W.; et al, Cyclic Loading Tests of-Masonry Piers, 3 Volumes, EERC 76/8, 78/28, 79/12 Earthquake Engineering Research Center, College of Engineering University of California, Berkeley, California 6.8 60-Day Report in response to IE Bulletin 80-11 for Dresden Nuclear Power Station Units 2 and 3, Commonwealth Edison Company Docket Numbers 50-237 and 50-249 dated July 3, 1980 ) 0050C
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O O O TABLE 1 MASONRY WALLS - FUNCTION AND PHYSICAL PROPERTIES Shown on Yhick- Size Boundary Design Wall Function ness Type Wythes Bond (height x width) Support Drawings Remarks D2-534-33E-20 Partition 12" llollow 1 Running 26'-10"x9'-1" v Yes Ey
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mx D2-534-33G-21 Blockout 18" Solid 3 Stack 9'-9"x16'-4" Yes 02-534-3311-22 Blockout 8" llollow 1 Running 14'-6"x6'-8" Yes D2-545-3811-23 Firewall 12" Hollow 1 Running 24'-0"x8'-6" Yes rn xx k D2-545-39J-24 Shielding 24" Solid 4 tunning 12'-3"x14'-2" Yes up D2-545-39J,-25 Shielding 24" Solid 4 tunning 8'-1"x6'-7"- Yes nu t)2-545-4111-26 Shielding 16" Solid 2 stack 8'-0"x17'-2" Yes 32-545-44J-31 Shielding 18" solid 3 tunning 8'-0"x6'-0" Yes 12-545-43L-32 Shielding 48" solid 8 tunning 10'-10"x11'-4" xxxx Yes I i xxn D2-545-43M-33 Shielding 56" Solid 8 tunning 10'-0"x4'-8" Yes 33-545-44J-34 Shielding 18" Solid 3 tunning 8'-1"x6'-0" Yes 33-545-45L-38 Shielding 48" '" Solid 8 tunning 10'-8"x11'-6" Yes 13-545-48N-40 Firewall 12" llollow 1 (unning 12'-8"x14'-10" Yes 12-545-40N-41 Firewall 12" llollow 1 tunning 12'.-8"x14'-10" Yes
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O O O TABLE 1 MASONRY WALLS - FUNCTION AND PHYSICAL PROPERTIES t Shown on Thick- Size Boundary Design Wall Function ness Type Wythes Bond (height x width) Support Drawings Remarks D2-534-4311-70 Partition 12" llollow 1 Running 3'-5"x260" Yes D3-534-45D-71 Partition 12" llollow 1 Running 13'-5"x9'-6" Yes D3-534-44D-72 Partition 12" llollow 1 Running 13'-5"x14'-7" , ****', Yes l D3-534-44D-73 Partition 12" llollow 1 Running 13'-5"x9'-7" Yes w D2-529-43C-74 Partition 12" llollow 1 Running 11'-4"x39'-4" Yes D2-545-41J-76 Shielding 24" Solid 4 Running 8'-1"x4'-0" Yes D3-545-4611-77 Shielding 24" Solid 4 Running 8'-2"x4'-1" Yes D2-517-33E-80 Partition 12 Ilo110w 1 Running 15'-11"x9'-3" Yes D2-503-35E-81 Shielding 36" Solid 6 Running 29'-11"x31'-10" mx Yes i I un D2-517-31F-82 Firewall 12" llollow 1 Running 16'-0"x23'-0" g Yes xxxx D2-517-32F-83 Firewall 12" llollow 1 Running 16'-0"x39'-0" Yes D2-517-32C-84 Firewall 12" llollow 1 Running 16'-0"x23'-0" g g Yes imx D2-517-3311-85 Shielding 12" llollow 1 Running 13'-0"x20'-8" Yes D2-517-3311-86 Firewall 12" llollow 1 Running 14'-3"x18'-0" Yes D2-517-3811-87 Firewall 12" llollow 1 Running 27'-7"x8'-8" ex Yes
') Ik 02-517-3911-88 Blockout 24" Solid 4 Running 7'-0"x14'-5" Yes dikt D2-517-39K-89 Shielding 24" Solid 4 Running 8'-2"x9'-10" Yes
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TABLE 1 MASONRY WALLS - FUNCTION AND PHYSICAL PROPERTIES { Shown on Size Boundary Design Thick-Wall Function ness Type Wythes Bond (height x width) Support Drawings Bemarks D3-517-45D-107 Blockout 12" 1 Running 14',-10"x14'-7" Yes llollow ****g
- . Xn%A D2-517-44D-108 Shielding 12" llollow 1 Running 7'-5"x6'-0" Yes Cells filled with sand h D2-517-44E-109 Partition 12" llollow 1 Running 9'-10"x13'-2" e Yes il#r x ,
- xD, D2-517-43E-110 Partition 12" llollow 1 Running 9'-10"x9'-6" Yes axnx l ' D2-517-3911-lll Blockout 24" IIollow* 4* Running 6'-5"x2'-5" No *-Assumed
- D2-528-3511-ll2 Firewall 12" llollow 1 Running 5'-1"x13'-3" Yes g+ u m .g D2-528-3411-113 r'irewall 12" 11ollow 1 Running 7'-8"x6'-lO" Yes lww<h
-m D3-528-5411-114 Firewall 12" Running Yes i
llollow 1 8'-1"x14'-0" pA du e x x
; D3-528-5411-ll5 Firewall 12" llollow 1 Running 8'-1"x8'-6" Yes D2-517-4311-ll6 Blockout 12" llollow 1 Running 9'-4"x25'-ll"
- x ^^ Yes j D3-517-4911-117 Shielding 24" IIollow* 2* Running 6'-4"x2'-4" y g No
- (xx,
- Assumed
, D2-507-45C-118 Shielding -8" Solid 1 Stack 6'-3"x2'-3" Yes D2-517-5A-120 Exterior 12" llollow 1 Running 20'-2"x14'-ll" xx" Yes I I j y. x x x D2-517-3A-121 Exterior 12" llollow 1 Running 20'-2"x14'-ll" Yes sanx I I e xx. e...... < .c ,
O O O TABLE 1 l MASONRY WALLS - FUNCTION AND PHYSICAL PROPERTIES 1 Shown on Thick- Size Boundary Design Wall Function nees Type Wythes Bond (height x width) Support Drawings Remarks D3-476-4511-122 Blockout 36" llollow 3 Running 4'-5"x9'-4" fl uu No Type of block and number of wythes assumed D3-476-4311-121 Blockout 36" llollow 3 Running 4'-8"x9'-4" "" No Type of block and number ) Y of wythes assumed D2-558-43K-35 Shielding 30" Solid 5 Running 5'-2" x 13'-3" C Yes
- D2-558-43K-36 Shielding 36" Solid 6 Running 8'-5" x 12'-0" Ah Yes
'asse not mortared D2-558-42K-37 Shielding 12" Solid 2 Running 5'-4" x 3'-4" l I Yes D3-558-45K-39 Shielding 36" Solid 6 Running 8 '-5" x '12 '-0" 4Q No OI. .e. 7 P S
O O O TABLE 2 ALLOWABLE STRESSES IN CONCRETE MASONRY WALLS Type 1 Wall TYDe 2 Wall Loadino Condition Loading Condition Abnormal Abnormal and Extreme and Extreme Type of Stress (psi) Normal Environmental Normal Environmental Flexural compression, Fm 340 560 390 650 Transverse and punching shear, Vm 35 59 38 63 Shear in mortar collar joint, Vmc] 10 14 10 14 Direct or Normal to bed joints, Pthn 14 23 -- -- flexural Hollow - Parallel to bed joints, Fthp 27 46 -- -- tension Normal to bed joints. Ptsn -- -- 27 46 Solid - Parallel to bed joints, P tsp -- -- 40 68 Mortar collar joints, F t cj 10 14 10 14 Axial compression allowable (Fa) is dependent upon the height and thickness of the wall Fa = 0.225 fk [1 - (_h_)3] - 40t TYDe 1 Wall Type 2 Wall Hollow-unit wall Solid-unit wall f6 = 1,020 psi fk = 1,190 psi mo= 750 psi mo= 750 psi
- 1. For walls laid in stack bond, shear and tensile stresses shall not be transferred across the continuous vertical joints.
- 2. Material properties and the shear capacity of mortared collar joints have been verified by field tests.
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- stresses 1 J J J J 1
) D2-528-35H-112 Meets allowable
- stresses a
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I l O APPENDIX B ADDITIONAL JUSTIFICATION OF THE REEVALUATION CRITERIA !O 1 0052C
Apprndix B, Page 11 of 11 TABLE OF CONTENTS (~T Pace
'd
1.0 INTRODUCTION
1 2.0 ABBREVIATIONS 1 3.0 ALLOWABLE STRESSES
- 1 3.1 AXIAL COMPRESSION 1 3.2 FLEXURAL COMPRESSION 3 3.3 BEARING 3 3.4 SHEAR 3 3.5 TENSION 4 3.6 SHEAR AND TENSILE BOND STRENGTH OF MASCNRY 6 COLLAR JOINT 4.0 IN-PLANE EVALUATION CRITERIA 7
4.1 INTRODUCTION
7 4.2 TEST RESULTS 8 5.0 ALTERNATIVE EVALUATION CRITERIA 8 5.1 ARCHING 8 5.2 ROCKING 9 5.3 SLIDING 9
6.0 REFERENCES
11 TABLES B-1 Compressive Strength of Axially Loaded Concrete Masonry Walls B-2 Flexural Strength - Single Wythe Walls of Hollow Units, Uniform Load, Vertical Span B-3 Flexural Strength, Vertical Span Concrete Masonry Walls, From Tests at NCMA Laboratory l B-4 Flexural Strength. Horizontal Span, Nonreinforced Concrete Masonry Walls OOS2C
Appsndix B. Page 1 of 13
1.0 INTRODUCTION
The following discussions and test results are intended to (("}
) provide additional justification of the reevaluation criteria for the safety-related masonry walls. This information has been extracted from the references identified in Section 6.0.
2.0 ABBREVIATIONS Abbreviation Title ACI American Concrete Institute ASCE American Society of Civil Engineers ATC Applied Technology Council EERC Earthquake Engineering Research Center NBS National Bureau of Standards NCMA National Concreta Masonry Association 3.0 ALLOWABLE STRESSES 3.1 AXIAL COMPRESSION The objective was to develop reasonable and safe engineering N design criteria for nonreinforced concrete masonry based on all existing data. A review in 1967 of the compilation of all available test data on compressive strength of concrete masonry walls did not, according to some, provide a suitable relationship between wall strength and slenderness ratio. From a more recent analysis, it was noted in many of the 418 individual pieces of data that either the masonry units or mortar, or in some cases, both units and mortar, did not comply with the minimum strength requirements established for the ( materials permitted for use in " engineered concrete masonry" ! construction. Accordingly, it was decided to reexamine the data, discarding all tests which included materials that did not comply with the following minimum requirements: Compressive Strength Material (psi) Solid units 1,000 Hollow units 600 (gross) Mortar 700 0052C 1 l
Appsndix B, Page 2 of 13 Also eliminated from the new correlation were walls with a slenderness ratio of less than 6; walls with an h/t ratio of less than 6 were considered to be in the category of " prisms". (~/) s_ For evaluation of slenderness reduction criteria, only axially loaded walls were used. The data that were available consisted of tests on 159 axially loaded walls with the h/t ratio ranging between 6 and 18. With this as a starting point, the data were analyzed assuming that the parabolic slenderness reduction function [1 - (h/40t)3] is valid. The basic equation used to evaluate the test data was: f test = Co f6 [1 -( h )3) (1) l S.F. 40t ' f test
= Co x S.F. (2) fk [1 - ( 40t h )3]
C o x S.F. =K (3) where f6 = Assumed masonry strength, net area, based on strength of units ft est = Net area compressive strength of panel S.F. = Safety Factor Co = Strength reduction coefficient h = Height of specimen, inches t = Thickness of specimen, inches The net area used in the above formulae is the net area of the masonry, and does not distinguish between type of mortar bedding. In the evaluation, mortar strength was assumed to be constant and was not considered a significant influence on wall strength. 1 It was determined that the objective of reasonable and safe criteria would be met if 90% of the K values were greater than the K value selected and gave a minimum safety factor of 3. Accordingly, the K values were listed in ascending order and the value satisfying the above conditions was K = 0.610 for the 159 tests as seen from Table B-2. Therefore, from Equation (3): 0052C
- -- - ._ . _ - -_ - , . _ - _ - ~ .--
Appandix B. Page 3 of 13 Co x S.F. =K Co x3 = 0.610 i-Co = 0.610 = 0.205 3 This value-(0.205) agrees very closely with the coefficient 0.20 which had been used for a number of years with reinforced masonry design. An analysis of the safety factors present with the formula: t f6 = 0.205 f6 [1 -( h-)3) l 40t , indicates the following: A safety factor greater than 3 is available in 93% of the tests, greater than 4 in 51% of the tests, greater than 5 in 15% of the tests, and greater than 6 in 5% of the tests. In ACI 531, the factor of 0.20 was increased to 0.225. The recommended value of 0.22 for unfactored loads has factors of safety comparable to those given above. 3.2 FLEXURAL COMPRESSION i i It is assumed that masonry can develop 85% of its specified
- compressive strength at any section. The recommended procedure for calculating the flexural strength of a section is the working stress procedure, which assumes a triangular distribution of strain.
For normal loads, an allowable stress of 0.33 fm has a factor of safety of 2.6 for the peak stress, which only exists at the extreme fiber of the unit and has been used in practice for many years. The recommended value for factored loads also only , exists at the extreme fiber and is the value recommended in the ATC-3-06 provisions. 3.3 BEARING These values for normal loads are taken directly from the ACI 531-79 code. 3.4 SHEAR
- The most extensive review on shear strength literature appears to have been done by Mayes, et al (Reference 6.1), and published in Earthquake Engineering Research Center Report EERC 75-15 which was performed for both brick and masonry block.
0052C 4 _ _ _ , . _ , , . - . . - , , _ . , , , _ _ ~ - - . - - , _ . _ _ . _ . _ . . _ _ _ _ , _ _ _ _ , _ . . _ _ . _ , _ . . . _ _ _ _ _ _ _ . . . . . . _ _ _ , ,
Appandix B, Page 4 of 13 This report attempts to summarize some of the findings that appear to be pertinent towards defining permissible shear stress O values that can be used for reevaluation of the nonreinforced concrete masonry. A number of tests have been identified as being the primary basis for permissible shear stress values in both NCMA Specifications for the Design and Construction of Load-Bearing Concrete Masonry (References 6.4 and 6.5) and the ACI Standard Building Code Requirements for Concrete Masonry Structures, ACI 531-79 (References 6.2 and 6.3). Out-of-plane flexural shear is defined by the code (References 6.2 and 6.3) as equaling 1.ls/h[. The derivation of this value is analogous to the permissible shear value of g~ concrete, disregarding any reinforcement, of 1.ls/f c (Reference 6.30). Although this is somewhat different (there is no tension steel by which to determine the appropriate j distance), the actual value is a mute point because tension will be the critical value for determining out-of-plane acceptability of a flexural member. Because of the nature of the stresses, however, and the various concerns with regard to the correctness of interpretation of the effects on boundary conditions, as well as such conditions as actual mortar properties, absorptivity of the mortar, confinement or lack of it on the test specimen during test, and arrangement and effect of actual load, it does not seem warranted to increase these stresses beyond a factor of 1.67 O under abnormal and extreme environmental loads. 3.5 TENSION 3.5.1 Normal to the Bed Joint A summary of the static monotonic tests performed to determine code allowable stress for tension normal to the bed joint was given in the NCMA specifications.
~
Stresses for tension in flexure are related to the type of mortar and the type of unit (hollow or solid). Research used to arrive at allowable stresses for tension in flexure in the vertical span (i.e., tension perpendicular to the bed joints) consisted of 27 flexural tests of uniformly loaded single-wythe walls of hollow units. These monotonic tests were made in
- accordance with ASTM E 72. Table B-2 summarizes the test results.
From Table B-2, the average modulus of rupture for walls built with Types M and S mortar is 93 psi on net area. For Type N mortar, the value is 64 psi. Applying a safety factor of 4 to these values results in allowable stresses for hollow units as follows: O 0052C , 1 e =w ,--. ---n-- r.-.,.--n..-----,-- , --~
Appsndix B. Page 5 of 13 Mortar Type Allowable Tension in Flexure (psi) l l M&S 23 N 16 These values are consistent with those published in the 1970 ACI Committee 531 report, which have been only slightly altered in the ACI 531-79 code. Based upon these tests, the minimum factors of safety for each mortar type are: Mortar Type Factor of Safety M 3.87 S 2.60 i N 2.81 To establish allowable tensile stresses for walls of solid i units, the 8-inch composite walls in Table B-3 were used. These walls, composed of 4-inch concrete brick and 4-inch hollow l block, were greater than 75% solid, and thus, were evaluated as l solid masonry construction. The modulus of rupture (gross area) for these walls averaged 157 psi, giving an allowable stress of 39 psi when a safety factor of 4 is applied. The composite wall tests in Table B-3 used Type S mortar. To establish allowable
-{
stresses for solid units with Type N mortar, the mortar influence established previously for hollow units was used. 23 = 39 ; f = 27 psi 16 f The minimum factor of safety for these tests for Type S mortar was 2.33. ! Recent dynamic tests have been performed at Berkeley and the values of tension obtained at cracking at the mid-height of the walls are as follows: 13 psi, 20 psi, 23 psi, and 27 psi. The recommended values have a factor of safety of 2.8 with respect to the lower bound of the static tests for the unfactored loads and are towards the lower limit of the initiation of cracking for the dynamic tests. An increase of 1.67 appeared reasonable for factored loads based on the static l tests. l b
\/ 0052C l
Appandix B, Page 6 of 13 3.5.2 Tension Parallel to Bed Joints Values for allowable tension in flexure for walls supported in (~Ns-) the horizontal span are established by doubling the allowable stresses in the vertical span. While it is recognized that flexural tensile strength of walls spanning horizontally is more a function of unit strength than mortar, it is conservative to use double the vertical span values. Table B-4 lists a summary of all published tests and indicates an average safety factor of 5.3 for the 43 walls containing no joint reinforcement and 5.6 for the 15 walls containing joint reinforcement. It is important to note that the factor of safety for those walls loaded at the quarter points (Reference 6.6) have an average factor of safety of 2.02 with a minimum value of'l.22, while those loaded at the center had an average factor of safety of 6.08 with a minimum value of 3.59. However, it should be noted that the values tested at the quarter points were also tested at 15 days. The results associated with the early date of testing and the use of quarter-point loading are difficult to explain other than to state they are at variance with all other test results. An increase in the allowable stresses by a factor of 1.67 is recommended for abnormal and extreme environmental loads. The recommended values could be increased because of the larger factors of safety in the test results; however, the value of 1.67 was chosen to be compatible with the increase in other
~/ stresses for unreinforced masonry.
3.6 SHEAR AND TENSILE BOND STRENGTH OF MASONRY COLLAR JOINT The collar joint shear and tensile bond strength is a major factor in the behavior of multi-wythe masonry construction, particularly with respect to weak axis bending. A widely stated position is that for composite construction, the collar joint must be completely filled with mortar. However, even if this joint is filled, there must be a transfer of shearing stress j across this joint without significant slip in order for full i composite interaction of the multiple wythes to be realized. Because the cracking strength, moment of inertia, and ultimate flexural strength of the wall cross-section are significantly influenced by the interaction of multiple wythes, it is crucial to establish the collar joint shear bond strength. The only applicable published data on the shear bond strength of collar joints is that determined by Bechtel on the Trojan Nuclear Power Plant (Reference 6.29). Therefore, to correlate the shear bond strength of mortared collar joints, l Plant-specific in situ tests were performed in August 1982. The f;' results of these tests showed the ultimate failure stresses to be 37.6 and 32.7 psi. A factor of safety of three was used in O>
\- ooS2c
Appandix B. Page 7 of 13 determining the allowable stress for normal load combinations. For abnormal and extreme environmental combinations, the gps allowable stress is increased by a factor of 1.33. There are conflicting data available on the relationship between the shear and tensile bond strengths. In most tests performed on mortar bed joints (couplet tests), the shear bond strength
- was approximately twice the tensile bond strength. In a more recent method of evaluation by means of centrifugal force, the shear bond strength was'found to be 60% of the tensile bond
- strength (Reference 6.16). The authors of the report consider the test procedure to be an improvement over present methods because joint precompression is essentially eliminated as a result of the testing procedure.
Because of the conflict in the test data, it is recommended that the values for tensile bond 'trengths be the same as for shear bond. Unless metal ties are used at closely spaced intervals (less than 16 inches on center), it is recommended that their
- contribution to shear and' tensile bond strength be neglected.
l 4.0 IN-PLANE EVALUATION CRITERIA
4.1 INTRODUCTION
Much of the effort to define a permissible in-plane shear stress may be somewhat academic in that the normal case for O unreinforced walls being used in nuclear plant structures, the nature of the shear, is one of being forced on the structural panel as a result of being confined by the building frame and j not one of depending on the panel to transmit building shear forces. This forced drift or displacement results in shear ; stresses and strains, but because of the complex interaction i between the panel and the confining structural elements, strain or displacement is a more meaningful index for qualifying the in-plane performance of the panel. I In-plane effects may be imposed on masonry walls by the relative displacement between floors during seismic events. However, the j walls do not carry a significant part of the associated story i shear, and their stiffness is extremely difficult to define. In addition, because the experimental evidence to date demonstrates that the apparent in-plane strength of masonry walls depends heavily upon the in-plane boundary conditions, load or stress on the walls is not a reasonable basis for evaluation criteria. 1 ( However, examination of the test data provided by the list of l references of Section 4.2 indicates that the gross shear strain of walls is a reliable indicator for predicting the onset of significant cracking. A significant crack is considered here to () oos2C
Appendix B, Page 8 of 13 be a crack in the central portion of the wall extending at least 10% of a wall's width or height. Cracking along the interface between a block wall and steel or concrete members does not O' limit the integrity of the wall. 4.2 TEST RESULTS Test results indicate that to predict the initiation of significant cracking, masonry walls must be divided into two categories: 4.2.1 Unconfined Walls: Not bounded by adjacent steel or concrete primary structure. Significant " confining" stresses cannot be expected. 4.2.2 Confined Walls: At a minimum, bounded top and bottom or bounded on three sides. For unconfined concrete block masonry walls, the works of Fishburn (Reference 6.18) and Becica (Reference 6.17), yield an allowable shear strain of 0.0001. It should be noted that Fishburn's test specimens were an average of 15 days old. For confined walls, the most reliable data appears to be that of Mayes et al (Reference 6.20). In static and dynamic tests of masonry piers (confined top and bottom) varying block properties, mortar properties, reinforcement, vertical load, and grout conditions, significant cracking was initiated at strains O exceeding approximately 0.001. It should be noted here that reinforcement can have no significant effect on the behavior prior to cracking. Similarly, the precence of cell grout should have no effect on stress or cracking in the mortar joints at a given strain. Both predictions are confirmed by the data in Reference 6.20. In addition, the data shows that the onset of cracking is not sensitive to the magnitude of initial applied , vertical load. Klingner and Bertero (Reference 6.19) performed a series of cyclic tests to failure and found excellent correspondence with a nonlinear analysis in which the behavior of an infilled frame prior to cracking is determined by an equivalent diagonal I strut. While the equivalent strut technique has been used by l many investigators to study the stiffness and load-carrying mechanisms of infilled frames, Klingner and Bertero found that the quasicompressive failure of the strut could be used to i predict the onset of significant cracking. l 5.0 ALTERNATIVE EVALUATION CRITERIA 5.1 ARCHING l An extensive test program performed by Gabrielson (Reference 6.21) on blast loading of masonry walls provides validation of the concept of arching action of masonry walls 0052C t
- j. Appendix B. Page 9 of 13 subjected t'o loads that exceed those that cause flexural cracking of an unreinforced masonry wall. An analytical
- procedure was developed to predict with reasonable accuracy the ultimate. capacity of the unreinforced walls tested.
5.2 RO'CKING
- Freestanding block walls may rock or slide as rigid bodies during an earthquake. Such rocking and sliding of walls in nuclear plants is permissible as long as it is within certain .
l tolerance limits. Only when the rocking of a wall increases to a critical value does the wall become unstable and overturn. A. freestanding wall starts to rock about an edge when the supporting floor moves horizontally with an acceleration greater i than (t/h)g, where t = thickness of wall, h = height of wall, j and g = acceleration due to gravity. If the coefficient of friction between the wall and floor is less than (t/h), the i wall will not rock, but will slide instead.
- The rocking behavior of cantilever structures has been studied and reported in References 6.23, 6.24, and 6.25. In References 6.24 and 6.25, a nonlinear differential equation for the rocking l motion is formulated and solved numerically for different j support excitations. Some test results on the rocking of block specimens are reported in Reference 6.24. The method used to
, predict the rocking of block walls is similar to the one in l References 6.22 and 6.23 for cantilever structures. Application of the method to seismic rocking of structures has been - ! justified in Reference 6.26 based on the numerical results using ANSYS program. A rocking wall switches from one edge to another and a considerable amount of energy is dissipated whenever the wall . j impacts the floor. Thus, the seismic rocking behavior of a wall is nonlinear and the frequency of rocking varies as a function of the maximum rocking angle in a cycle (Reference 6.23). 5.3 SLIDING Sliding is the horizontal movement of a wall as a rigid body with respect to the supporting floor. In general, a wall will
- either rock or slide during an earthquake. It appears that a l rocking wall will not slide and vice versa. Sliding resistance and sliding displacement of a wall depend on the coefficient of friction between the two contact surfaces. Based on the discussion in Reference 6.31, the following are reasonable friction values for concrete depending on the surface roughnesses
0052C
\ .--...,n. , - - - . . . , , - , , , _ , --.,-- _.-,_~_-
Appendix B, Pago 10 of 13 y = 0.33 -between smooth surfaces (} y y
= 0.67 -between smooth and rough surfaces
= 1.0 -between rough surfaces seismic sliding of cantilever structures is studied in Reference 6.28 by nonlinear seismic analyses using ANSYS program. This study substantiates the simple energy balance method given in References 6.22 and 6.27 to predict sliding.
A wall begins to have sliding oscillations whenever the horizontal seismic floor acceleration in g-units exceeds the friction coefficient. O l l 0052C
Appandix B, Page 11 of 13
6.0 REFERENCES
6.1 Mayes and Clough, " Literature Survey - Compressive, U Tensile, Bond, and Shear Strength of Masonry," Earthquake Engin?ering Research Center, University of California, 1975 6.2 ACI Standard. " Building Code Requirements for Concrete Masonry Structures" (ACI 531-79) 6.3 Commentary on " Building Code Requirements for Concrete Masonry Structures" (ACI 531-79) 6.4 " Specification for the Design and Construction of Load-Bearing Concrete Masonry," NCMA, 1979 6.5 Research Data and Discussion Relating to " Specification for the Design and Construction of Load-Bearing Concrete Masonry," NCMA, 1970 6.6 Fishburn. "Effect of Mortar Strength and Strength of Unit on the Strength of Concrete Masonry Walls," Monograph 36, NBS, 1961 6.7 Copeland, R.E. and Saxer E.L., " Tests of Structural Bond of Masonry Mortars to Concrete Block," Proceedings, American Concrete Institute. Volume 61, Number ll, November 1964 6.8 Richart, Frank E., Moorman, Robert B.B., and O' Woodworth, Paul M., " Strength and Stability of Concrete Masonry Walls," Bulletin 251. Engineering Experiment Station, University of Illinois, 1932 l 6.9 Hedstrom, R.O., " Load Tests of Patterned Concrete Masonry Walls," Proceedings, American Concrete Institute, Volume 57, p 1265, 1961 1 1 6.10 Menzel, Carl A., " Tests of the Fire Resistance and Strength of Walls of Concrete Masonry Units," Portland Cement Association, 1934 6.11 Nylander, H., " Investigation of the Strength of Concrete Block Walls," Swedish Cement Association, Technical Communications and Reports of Investigations, 1944 Number 6 (October) 6.12 Copeland, R.E. and Timms, A.G., "Effect of Mortar Strength and Strength of Unit on the Strength of Concrete Masonry Walls," Proceedings, American Concrete Institute, Volume 28, p 551, 1932 O 0052C
Appendix B, Paga 12 of 13 6.13 Beyer, A.H. and Krefeld, W.J., " Comparative Tests of Clay, Sand-Lime, and Concrete Brick Masonry," Columbia University, Department of Civil Engineering, April 1923 6.14 Livingston, A.R., Mangotich, E., and Dikkers, R., " Flexural Strength of Hollow Unit Concrete Masonry Walls in the Horizontal Span," Technical Report 62, NCMA, 1958 6.15 Cox, F.W. and Ennenga, J.L., " Transverse Strength of Concrete Block Walls," Proceedings, ACI, Volume 54, p 951, 1958 6.16 Hatzinkolas, M., Longworth, J., and Wararuk, J.,
" Evaluation of Tensile Bond and Shear Bond of Masonry by Means of Centrifugal Force," Alberta Masonry Institute, Edmonton, Alberta 6.17 Becica, I.J. and Harris, H.G., " Evaluation of Techniques in the Direct Modeling of Concrete Masonry Structures," Drexel University Structural Models Laboratory Report M77-1, June 1977 6.18 Fishburn, C.C., "Effect of Mortar Properties on Strength of Masonry," National Bureau of Standards Monograph 36 U.S. Government Printing Office, November 1961 l
- 6.19 Klingner, R.E. and Bertero, V.V., " Earthquake Resistance of l Infilled Frames," Journal of the Structural Division, ASCE, June 1978 6.20 Mayes, R.L., Clough, R.W., et al, " Cyclic Loading Tests of Masonry Piers," 3 volumes, EERC 76/8, 78/28, 79/12, Earthquake Engineering Research Center, College of l Engineering, University of California, Berkeley, California 6.21 Gabrielson, G., Wilton, C., and Kaplan, K., " Response of Arching Walls and Debris from Interior Walls Caused by Blast Loading," URS Report 2030-23, URS Research Company, 1975 6.22 Topical Report, " Seismic Analyses of Structures and Equipment for Nuclear Power Plants," BC-TOP-4, Revision 4, Bechtel Power Corporation, 1980 6.23 Housner, G.W., "The Behavior of Inverted Pendulum Structures During Earthquakes," Bulletin of the l Seismological Society of America, Volume 53, Number 2, l February 1963 1
6.24 Aslam, M., et al, " Earthquake Rocking Response of Rigid l Bodies," ASCE, Journal of the Structural Division, ST2, February 1980 0052C
Appendix B, Pago 13 of 13 6.25 Yim. C-S., et al, " Rocking Response of Rigid Blocks to Earthquakes," Report UCB/EERC-80/02, University of California, Berkeley, January 1980 [ 6.26 " Seismic Loading Criteria for Base Mat Design," Bechtel Power Corporation, San Francisco, Internal Report, Revision 2, November 1976 I 6.27 Newmark, N.M., " Effects of Earthquakes on Dams and l Embankments," Geotechnique, Volume XV, Number 2, l pp 139-159, June 1965 ' l 6.28 Kausel, E.A., et al, " Seismically Induced Sliding of Massive Structures," ASCE, Journal of the Geotechnical Engineering Division, GT12. December 1979 6.29 Report on Tests of Shear Strength of Collar Joint Mortar in Double Wythe Masonry Walls, Trojan Nuclear Power Plant, Portland General Electric Company, April 14, 1980 6.30 ACI Standard, " Building Code Requirements for Structural Plain Concrete" (ACI 322-72) 6.31 PCI Design Handbook, " Precast Prestressed Concrete," Prestressed Concrete Institute, Second Edition, 1978 O , l 0052C
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. i
- TAELE B-1 p
\ COMPRESSIVE STREI!GTH OF AXIALLY LOADED CO?iONETE MASOURY WALLS Concrete Masonry Units Mortar Walls Strength, Strength, Percent psi, net Str., psi, net Ref. Solid area fE, psi psi Bedding h/t f test ffC K - S.F. 6.8 63 1160 980 1180 Full 6.0 750 978 .798 3.83 63 1160 980 1180 Full 6.0 685 978 .701 3.49 63 1160 980 1160 FS 6.0 670 978 .686 3.42 63 1160 980 900 FS 6.0 555 978 .568 2.83 63 1200 1000 1230 Full 6.0 860 995 .863 4.30 63 1200 1000 730 Full 6.0 625 995 .627 3.12 63 1200 1000 960 FS 6.0 580 995 .582 2.89 63 1200 1000 780 FS 6.0 650 995 .652 3.25 63 1320 1060 880 Full 6.0 1110 1055 1.050 '5.25 63 1320 1060 810 Full 6.0 970 1055 .918 4.58 r~N 63 1320 1060 810 FS 6.0 780 1055 .738 3.69 (J 63 1160 980 1080 Full 6.0 800 978 .818 4.08 63 1160 980 10S0 Full 6.0 670 978 .686 3.42 63 1810 1275 1270 Full 6.0 940 1270 .739 3.67 63 1810 1275 1270 Full i 6.0 940 1270 .739 3.67 63 1505 1150 1670 Full ; 6.0 825 1145 .719 3.60 63 1505 1150 1670 Full ; 6.0 820 1145 .715 3.57 63 1240 1020 980 Full ; 6.0 1010 1015 .993 4.95 63 1240 1020 980 Full j 6.0 870 1015 .856 4.26 63 1720 1230 880 Full j 6.0 1035 1225 .844 4.21 63 1720 1230 880 Full ! 6.0 940 1225 .766 3.81 63 1380 1090 1730 Full i 6.0 1000 1085 .920 4.58 63 1380 1090 1730 Full 6.0 1010 1055 .930 4.63 63 1780 1262 1870 Full 6.0 1450 1257 1.152 5.75 63 1780 1262 '1870 Full ! 6.0 1570 1257 1.248 6.22 43 3300 1790 1230 Full ! 6.0 1560 1782 .874 4.36 l 43 3300 1790 1230 Full , 6.0 1730 1782 .969 4.84 70 1645 1208 1140 Full . 6.0 1000 1200 .830 4.15 l 5.06 70 1645 1208 '1140 Full t 6.0 1220 1200 1.013 i e
$.12 62 509 458 3140 Full 6.0 303 455 .664 3.30 63 509 458 1610 Full . 6.0 295 455 .646 3.21 63 509 458 1060 Full ! 6.0 295 455 .646 3.21 63 840 756 3140 Full 6.0 532 753 .706 3.52 63 840 756 1610 Full 6.0 550 753 .716 3.52 63 840 756 1060 Full 6.0 505 753 .670 3.35
() c j 63 875 788 3140 Full ; 6.0 438 785 .558 2.79
- i. -- -. . .
Sheet 2 of 4 Table B-1 (continued) Concrete Masonry Units Mortar Walls O' Strength. Strength. psi, net Percent psi, net Str., Ref. Solid area fE, psi psi Bedding h/t feest ff C K S.F. 63 875 788 1610 Full 6.0 430 785 .547 2.74 6!12 63 875 788 1060 Full 6.0 500 785 .637 3.17 63 1080 940 3140 Full 6.0 605 936 .646 3.22 63 1080 940 1610 Full 6.0 715 936 .763 3.81 63 1080 940 1060 Full 6.0 765 936 .817 4.07 63 1230 1015 3140 Full 6.0 1160 1010 1.146 5.70 63 1230 1015 1610 Full 6.0 1000 1010 .988 4.92 63 1230 1015 1060 Full 6.0 1110 1010 1.097 5.46 63 1410 1105 3140 Full 6.0 1140 1100 1.030 5.16 63 1410 1105 1610 Full 6.0 985 1100 .893 4.45 63 1410 1105 1060 Full 6.0 1030 1100 .935 4.66 63 1520 1157 3140 Full 6.0 660 1152 .572 2.85 63 1520 1157 1610 Full 6.0 740 1152 .642 3.20 . 63 1520 1157 4780 Full 6.0 830 1152 .719 3.58 63 1860 1295 3140 Full 6.0 1476 1290 1.143 5.70 63 1860 1295 1610 Full 6.0 1539 1290 1.192 5.94 63 1860 1295 1060 Full 6.0 1365 1290 1.058 5.27 63 2510 1554 3'140 Full 6.0 1698 1550 1.096 '5.47 63 2510 1554 1610 Full 6.0 1365 1550 .881 4.39 63 2510 1554 1060 Full 6.0 1325 1550 .856 4.27 63 3030 1710 3140 Full 6.0 2222 1705 1.304 6.50 1 63 3030 1710 1610 Full 6.0 2222 1705 1.304 6.50 63 3030 1710 1060 Full 6.0 1984 1705 1.164 5.80 63 3740 1923 3140 Full 6.0 1857 1918 .969 4.82 63 3740 1923 1610 Full 6.0 2523 1918 1.316 6.56 63 3740 1923 4780 Full 6.0 2317 1918 1.209 6.03 63 6640 2400 3140 Full 6.0 3587 2392 1.499 7.48 2392 1.612 8.04 63 6640 2400 1610 Full 6.0 3856 63 6640. 2400 4780 Full 6.0 5031 2392 2.102 10.49 6 13 100 1383 1557 2562 Full 7.0 1140 1254 .910 4.13 100 1388 1640 3017 Full 7.0 1358 1635 .830 4.57 100 1892 1853 2317 Full 7.0 1469 1846 .795 4.52 1625 .858 4.29 i 100 1923 1630 2153 Full 7.0 1394 100 2508 2390 2427' Full 7.0 1947 2380 .817 4.56 100 2529 2630 2347 Full 7.0 2151 2620 .820 4.68 100 2545 2130 2143 Full 7.0 1930 2120 .909 4.17 100 2610 2220 3195 Full 7.0 2078 2210 .939 4.71 i 100 2678 2030 2322 Full 7.0 1832 2020 .905 3.99 100 4474 2210 2792 Full 7.0 1810 2200 .821 4.10 100 4474 2540 2154 Full 7.0 2157 2530 .937 L.09
** ff values frem this reference were deter =ined from prism tests in-stead of assumed values. Test results multiplied by factor of 1.2.
! I I ( _ _ . . O
. . , . . , .h . .w.,,. .. , ,
. Sheet 3 of h Table B-1 (continued)
Concrete Ibsonry Units Mortar Walls Strength, Strength, Percent psi, net Str., psi, net Ref. Solid area fE, psi psi Bedding h/t f test fEC K S.F. 6.10 62 2547 1556 1400 FS 9.0 1241' 1540 .807 4.05 62 1886 1305' 1400 FS 9.0 1153 1290 .894 4.50 62 1999 1350 1400 FS 9.0 967 1335 .724 3.63 62 1499 1150 1400 FS 9.0 685 1135 .603 3.02 62 1934 1325 1400 Full 9.0 1354 1310 1.033 5.19 62 2305 1473 1400 FS 9.0 1096 1455 .752 3.78 62 2136 1405 1400 FS 9.0 1128 1390 .812 4.07 62, 1773 1260 1400 FS 9.0 1088 1245 .873 4.38 62 1298 1049 1400 FS 9.0 854 1037 .823 4.14
- 62 1241 1031 1400 FS 9.0 685 1010 .678 3.41 62 1612 1196 1400 FS 9.0 991 1180 .838 4.20 62 1805 1273 1400 FS 9.0 1088 1260 .864 4.33 62 1491 1146 1400 FS 9.0 834 1133 .754 3.78 62 1088 944 1400 FS 9.0 629 933 .673 3.38 62 1918 1318 1400 FS 9.0 1072 1302 .822 4.12 62 1169 985 1400 FS 9.0 605 975 .621 3.12 45 2655 1598 1400 FS 9.0 989 1578 .626 3.15 62 1088 944 1400 FS 9.0 564 933 .604 3.03 62 1290 1045 1400 FS 9.0 701 1032 .678 3.41 l) , 62 1999 1350 1400 FS 9.0 1104 1335 .826 4.16 \' 62 1862 1296 1400 Full 9.0 1378+ 1280 1.075 5.44+
62 967 870 1400 Full 9.0 758 860 .881 4.42 62 1967 1338 1400 Full 9.0 1241 1320 .938 4.72 6.10 57 2280 1463 1400 FS 9.3 1228 1450 .849 4.27 9.3 l 67 1917 1318 1400 FS 836 1302 .642 3.23 67 13.80 1090 1400 FS 9.3 724 1078 .672 3.37 67 1902 1312 1400 FS 9.3 1223 1300 .943 4.74 67 1246 1023 1400 FS 9.3 739 1010 .731 3.67 57 2087 1386 1400 FS 9.3 1193 1370 .871 4.38 J 57 2087 1386 830. FS 9.3 1298 1370 .948 4.76 57 23S5 1505 1400 FS 9.3 719 1485 .484 2.44
< 57 2385 1505 1400 FS 9.3 789 1485 .530 2.67 57 2385 1505 ,1400 FS 9.3 1105 1485 .743 3.74 , 57 2385 1505l1400 FS 9.3 1140 1485 .766 3.85 6.8 39 1590 1187 ,1130 Full 9.5 885 1170 .756 3.79 39 1590 1187! 1010 . Full 9.5 1000 1170 .853 4.28 39 1718 1238' 1070 Full 9.5 949 1220 .777 3.89 39 1718 1238 ,
840 Full 9.5 910 1220 .745 3.73 I O
==* N- -
Ye eo _ . . -.ap,e a w. a.* y e
=e e-p .+..+-
Sheet h of k t,{ Table B-1 (continued) () Concrete Masonry Units Strength, Mortar Strength, Ralls Percent psi, net Str., psi, net Ref. Solid area ff, psi psi Bedding h/t f test fyC K S.F. 6.8 63 1159 985 1180 Full 14.3 683 940 .726 3.62 63 1159 985 1440 Full 14.3 690 940 .734 3.66
, 63 -1159 985 1440 Fuli 14.3 738 940 .784 3.91 63 1159 985 1060 FS 14.3 532 940 .565 2.82 63 1159 985 900 FS 14.3 563 940 .599 2.98 63 1159 985 1920 FS 14.3 563 940 .599 2.98 63 1206 1020 1230 Full 14.3 738 974 .758 3.80 63 1206 1020 730 Full 14.3 683 974 .702 3.51 I 63 1206 1020 1130 Full 14.3 746 974 .765 3.83 63 1206 1020 960 FS 14.3 571 974 .586 2.94 63 1206 1020 780 FS 14.3 603 974 .619 3.10 63 1206 1020 1250 FS 14.3 595 974 .610 3.05 63 1317 1080 880 Fuli 14.3 905 1030 .877 4.38 63 1317 1080 750 Fuli 14.3 1063 1030 1.030. 5.14 63 1317 1080 810 Full 14.3 929 1030 .901 4.49 63 1317 1080 1020 FS 14.3 714- 1030 .692 3.45 1030 .647 3.23 63 1317 1080 1020 FS 14.3 667 63 1159 985 1120 Full 14.3 579 940 .616 '3.07 4
63 1159 985 1150 Full 14.3 635 940 .675 3.37 63 1159 985 1080 -Full 14.3 635 940 .675 3.37 p(,j, l 63 1810 1274 12,70 Full 14.3 873 1218 .717 3.54 63 1810 1274 940 Full 14.3 881 1218 .725 3.58 63 1810 1274 1120 Fuli 14.3 817 1218 .671 3.32 63 1508 1153 1380 Full 14.3 706 1100 .641 3.17 63 1508 1153 1380 Full 14.3 746 1100 .677 3.34 63 1508 1153 1670 Full ,14.3 643 1100 .584 2.88 63 - 1238 1025 1920 Fuli 14.3 833 978 .851 4.24 63 1238 1025 980 -Full 14.3 802 978 .819 4.09 63 1238 1025 1280 Full 14.3 817 978 .835 4.15 63 1714 1230 800 Full 14.3 1111 1172 .946 4.73 63 1714 1230 800 Full '14.3 1127 1172 .959 4.79 63 1714 1230 750 Full l14.3 1079 1172 .918 4.59 63 1381 1090 1730 Fuli 14.3 968 1040 .930 4.64 1040 .923 4.61 63 1381 1090 3 2200* Full 14.3 960 5.21 63 1774 1245 2100 Full 14.3 1240 1190 1.043 63 2253 1450 1230 Full 14.3 936 1385 .675 3.42 63 2253 1450 1270 Full 14.3 920 1385 .664 3.37 70 1643 1206 1180 Full 14.3 207 1150 .701 3.55 1150 .857 4.33 70 1643 1206 1300 Full l14.3 986 .732 3.66 Full (14.3 727 993 55 1273 1040 1220
- 1273 1040 1220 Fuli 114.3 764 993 .770 3.84 55 100 2900 1665 .1475 Full 15.0 1250 1565 .801 3.93 4
65 1746 1250 ! 1400 Full 118.0 1108 1135 .975 4.87 6.10 785 925 .350 4.25 65 1246 1015 l1400 Full l18.0 ( ). g 65 1562 1175 11400 Full l18.0 1203 1065 1.131 5.66 i
~~.,"r "~"E'~'~~:~_
l
.** Sheet 1 of 1
'"AELE E-2 (3
w/ FLEXURAL STRENGTH--SINGLE WYTHE WALLS OF HOLLOW UNITS-UNIFORM LOAD--VERTICAL SPAN Mortar Type , Proportion Modulus of Rupture ASTM C 270 psi, Net Area , Reference M 110 6.7 108 4 IICMA M M 102 6.7 M 97 6.7 M 95 #CMA 94 NCMA S , 91 NCMA M 89 NCMA M N 88 6.9 S 84 6.7 83 NCMA S S 81 6.7 75 NCMA . S 69 NCMA S 69 O u N 67 62 6.9 6.7 S 60 N 58 6.9 N 45 '- ' 6.9 0 60 6.7 0 41 6.9 0 36 6.9 0 36 6.9 0 33 6.9 o 32 6.9 30 6.7 0 27 6.9 0 ' s. l O
TABLE B-3 Sheet 1 of 1 TLtXURAL STRENGTH, VERTICAL SPAN CONCRETE MAS 0XRY UALLS TROM TESTS AT NCMA LABORATORY Wall Modulus of Rusture
. yet
. Max. Net Mortar ASn! Nominal
- Uniform Section Cross Redded Hortar Thickness* . Load Mod lus Area, Area, psi .!
Type * , in. psf. in 3/ft psi Honowythe Walls of Hollow Units M 8 85.15 - 80.97 61.74 88.73 ' M 8 - 87.10 80.97 63.15 90.76 N ' 8 91.00 80.97 65.97 8 94.82 H 8 103.35 80.97 74.93~ ! 107.69 S 8 62.40 80.97 45.24 1 69.47 S 8 72.15 80.97 52.31 l 75.18 5 12 . 183.3 164.64 57.11 , 93.94 50.22 82.62 S
- 12 161.2 164.64 .
1 i Composite Walls of Concrete Brick & Rollou CMU
'O S -- 4 8 222.3 103.82 161.16'i, 180.67 5 8 219.7 103.82 159.29 -
178.55 l 5 8 187.2 78.16 135.72 .- 202.09 l 5 8 228.8 103.82 165.88 185.95 i 5 8 218.4 78.16 158.34 , 235.77 l S 8 223.6 78.16 162.11 ' 241.33 ! S 12 171.6 139.83 53.46 103.55 l , S 12 150.8 139.83 46.98 91.00 l l S 12 156.0 139.83 l 48.60 94.14 3 5 12 .. 213.2 139.83 66.42 , 128.66
- Cavity Walls .
i l S 10 - - 98.8 . 50.36 158.62 165.55 ! S 10 156.0 50.36 250.44 261.38j S. 10 88.4 48.16 141.91 154.ES , S 10 119.6 50.36 192.01 200.40 i S 10 , 114.4 50.36 183.66 191.63 . S 10 109.2 48.16 175.30 J S1.32
- S 12(4-4-4) ', 145.6' I 50.36 233.73 2f.3 .9a i 50.36 233.73 243.94 ,
S 12(4-4-4) ! 145.6 1 1:6.63 - l O s 5 12(6-2-4) 12(6-2-4) u5.2 119.6 i 77.c0 77.c0 127.as 112.68 129.70l ' l ! ___ 1_ l
- Mortar type by proportion requirements 1-----_-_-_. __.
.. Shest 1 of 2
( ) v TABLE B h FLEXURAL STRENGTH, HORIZONTAL SPAN, M0"R"INFORCED CONCRETE 1/130NRY WALLS Modulus *
- Mortar Loading of Rupture Construction Type Type psflNetArea' psi Act./ Allow Ref.
Uniform 127 132 -4.13 .6.9 Monowythe 8" N 6.9 Hollow, 3-Core N'
" 136 141 4.41 N
127 132 4.13 6.9 169 176 5.50 6.9 N 173 180 5.63 6.9 N
" 123 128 4.00 6.9 0
158 164 5.13 6.9 0 149 155 4.84 6.9 Monowythe 8" N 6.9 Hollow, Joint N 160 166 5.19 193 201 6.28 6.9 Reinf. @ 16 in.cc N " 4.88 6.9 0 150 156
" 186 193 6.03 6.9 0
203 211 6.59 6.9 Monowythe 8" N 6.9 Hollow Joint N 196 204 6.38
" 202 210 6.56 6.9 Reinf. @ 8 in.cc 0
" 6.34 6.9 0 195 203 1.81 6.6 Monowythe 8" N 1/4 pt 56 58 6.6 38 39 1.22 Hollow N 6.6 N
61 63 1.97
" 1.94 6.6 N 60 62 6,6 N
" 69 71 2.22
" 3.00 6.6 N 93 96 199 217 4.72 6.15 8" Monowythe M Center 6.15 Hollow, 2-Core M 176 192 4.17 151 165 3.59 6.15 M .
" 111 210 4.57 6.15 4-2-4 Cavity M 6.15 Wall, Hollow M-135 255 5.54 95 180 3.91 6.15 Units M 8" Monowythe M "
159 173 3.76 6.15 i Hollow 2-Core M " 159 173 3.76 6.15 l Joint Re. @ 8"oc M " 191 208 4.52 6.15 f
" 6.52 4-2-4 Cavity of M 159 300 6.15
" 300 6.52 6.15 Hollow Units Tied M 159
" 6.52 w/ Joint Re. 3 8oc M 159 300 g 6.15 l v :
. . _ . . J
I ' '.. Sheet 2 of 2 A
. ' Table B h (continued)
' h' 'I' -
Modulus I.oading of Rir.pture S.F. Mortar Construction Type Type psf Net Area; psi
- Act / Allow i Paf l
N Center 138 365 11.41 6.1h
'. 4" Hollow " 5.14 a
Monowythe N 157 415 12.97
- N 101 268 3.38 4,14 J
268 202 4.39 4.1h 8" Hollow M 6.1h Monowythe' M " 314 237 5.15 M " 314- 237 5.15 6.14 8" Hollow N
'" 277 210 6.56 4 lh 314 237 7.41 5 14 Monowythe N 314 237 7.41 6.14 N
259 195 6.09 6.1h 8" Hollow 0 Monowythe 0 277 210 6.56 6.1h 0 " 277 210 6.56
. 6.1h
" 268 202 4.39 6.1h 8" Hollow M E.1h Monowythe M 297 224 4.87 M " 277 210 4.56 6.1h 8" Hollow N 277 210 6.56 6.1h Monowythe N
" 259 195 6.09 6.1h
' N 297 224 7.00 6 1h 8" Hollow 0 360 27i 8.45 6.1h Monowythe O
" 297 224 7.00 6.1h 0
" 268 202 6.31 6.14 12" Hollow N "
352 142 4.44 6.1h N 314 127 3.97 6.1h Monov/the 6.1h N 333 134 4.19 I s 1 lO
,-..e = w- e . -e
l 180-DAY REPORT IN RESPONSE TO IE BULLETIN 80-11 FOR QUAD CITIES NUCLEAR POWER STATION UNITS 1 AND 2 COMMONWEALTH EDISON COMPANY DOCKET NUMBERS 50-254 AND 50-265 O PREPARED BY: Bechtel Power Corporation Report Date: May 9, 1983 Revision 3 0 0051C
TABLE OF-CONTENTS Paae ( ,,
1.0 INTRODUCTION
1 2.0 SCOPE 1
3.0 DESCRIPTION
OF MASONRY WALLS 1 3.1 LOCATION 1 3.2 FUNCTION 1 3.3 WALL CONFIGURATION 2 3.4 CONSTRUCTION MATERIALS 2 3.5 CONSTRUCTION PRACTICES 3 3.6 RECONCILIATION WITH 180-DAY REPORT, 3 ! REVISION 2 /$\ 4.0 REEVALUATION OF MASONRY WALLS 4 4.1 POSTULATED LOADS 4 4.2 ALLOWABLE STRESSES 6 4.3 JUSTIFICATION OF THE REEVALUATION CRITERIA 6 4.4 SEQUENCE OF ANALYSIS 7 4.5 METHOD OF ANALYSIS AND ACCEPTANCE CRITERIA 7 4.6 ASSUMPTIONS AND ANALYSIS CONSTRAINTS 8 4.7 MASONRY WALL TESTING PROGRAM 10 5.0 RESULTS OF MASONRY WALL EVALUATION 10 () 5.1
SUMMARY
11
6.0 REFERENCES
11 l APPENDIXES A Masonry Wall Plans B Additional Justification of Reevaluation Criteria l TABLES 1 Masonry Walls - Function and Physical Properties 2 Allowable Stresses in Concrete Masonry Walls 3 Applied Loads and Evaluation Results O 0051C u
l.0 INTRODUCTION This 180-day report is being issued in response to NRC IE O Bulletin 80-11, dated May 8, 1980 (Reference 6.2). This report
.has-been prepared by Bechtel Power Corporation, Ann Arbor, Michigan, for Commonwealth Edison Company's Quad Cities Nuclear Power Station, Units 1 and 2. Revision 3 of this report incorporates the design criteria development that have occurred subsequent to the previous revision. Therefore, this report is g
intended to finalize the response to the above bulletin. 2.0 SCOPE The 180-day report furnishes information requested in Item 2b of NRC IE Bulletin 80-11. It deals solely with masonry walls identified in this report as safety-related. Any masonry wall is considered safety-related when it is in proximity to or has attachments from safety-related piping or equipment such that wall failure could damage a safety-related system. The analyses are based on as-built conditions identified during site surveys of June and July 1980 and July and September 1981.
3.0 DESCRIPTION
OF MASONRY WALLS 3.1 LOCATION The figures in Appendix A show the location of all safety-related masonry walls. 3.2 FUNCTION The function of each masonry wall is identified in Table 1 according to one of the following categories. 3.2.1 Fire Wall These walls were constructed to prevent the spread of fire from one side of the wall to the other according to the appropriate fire rating associated with the wall's thickness. 3.2.2 Partition Wall The partition walls are interior dividing walls whose sole purpose is to separate a portion of a room from the remainder. 3.2.3 Shieldino Wall The masonry shielding walls are typically made of solid units which are required to restrict radiation exposures. 0051C
3.2.4 Blockout A blockout, made of masonry, seals an opening in a larger
<'3 concrete wall. These openings are left in the concrete walls to \/ provide for equipment installation or pipe penetrations before the opening is sealed with the masonry.
3.2.5 Exterior Wall Exterior walls have at least a part of one face exposed to the outside. Only exterior walls are subject to wind or tornado loads. 3.3 WALL CONFIGURATION Wall dimensions and boundary conditions for each wall are indicated in Table 1. Each boundary is categorized as either a fixed support capable of providing both moment and shear resistance, a simple support resisting only shear forces, or a free edge through which no forces can be transferred. 3.4 CONSTRUCTION MATERIALS 3.4.1 Hollow Masonry Units The hollow masonry units, which are identified on the design drawings, were specified as three-core blocks conforming to ASTM C 90, Grade N-I, Lightweight Aggregate. Masonry walls, which are not shown on the design drawings, were assumed to f'l consist of hollow units of the same type specified above. This
assumption and the material properties of the hollow block were verified by plant-specific tests (see Section 4.7). Site surveys found that the hollow masonry walls consist of two-core units.
3.4.2 Solid Masonry Units jg i l The solid masonry units identified on the design drawings were specified as ASTM C 145, Grade N-1. Plant-specific tests were performed to determine the material properties of the solid t block (see Section 4.7). 3.4.3 Mortar l The mortar used in the construction of the hollow masonry walls was specified as ASTM C 270 Type N, with a 28-day compressive strength of 750 psi. Tests on the mortar used in the solid masonry found it to be, as a minimum, comparable to that specified for hollow masonry. Ci 2
\l 00 SIC 3
r 3.4.4 Rainforcino Staal According to the design drawings and specifications, the masonry p walls are reinforced in the bed joint of every other course. v .This joint reinforcement consists of heavy-duty, continuous, rectangular, ladder type steel reinforcement, whose minimum yield strength is 65 ksi. Deformed bar steel, where shown on the drawings, has a minimum yield' strength of 40 ksi. 3.4.5 Anchors Masonry anchors have been used in certain locations to tie the masonry wall to an adjacent structural element. These anchors consist of two types: corrugated metal ties (dovetail anchors) which are used for connections to concrete walls or columns and 3/16-inch diameter adjustable bar ties welded to the supporting structural steel. [ 3.5 CONSTRUCTION PRACTICES The masonry walls at the station were constructed in accordance l with the applicable job and standard specifications for masonry
, work and have a high quality of masonry workmanship.
Conformance to applicable ASTM specifications was required for concrete blocks, mortar,' reinforcing ties, and anchors. Storage and protection of blocks and walls, as well as cold weather protection, were specified. The mortar joints of solid masonry ! walls were required to be constructed with full mortar coverage on all vertical and horizontal faces. The vertical joints were to be shoved tight. A full mortar bedding was specified for O webs and face shells of the hollow masonry walls. Face shells were required to be fully buttered and pressed into place to ensure full, well-compacted, horizontal and vertical mortar joints. 1 3.6 RECONCILIATION WITH 180-DAY REPORT, REVISION 2 Revision 2 of the 180-day report identifies 82 safety-related masonry walls. Eleven of these have since been reclassified as - nonsafety-related. Three walls were discovered to be outside of l' the proximity of any safety-related items. Ten walls were originally safety-related due to the proximity of the control room HVAC equipment. A new seismically qualified HVAC system is I to be installed at a new location, thereby making the existing system redundant and eight walls nonsafety-related. The jh\ isolation dampers of this system will continue to be safety-related. Therefore, the two masonry walls in proximity to these dampers will remain safety-related. Table 1 identifies those walls found to be nonsafety-related. This latest revision of the 180-day report also incorporates the following information. 0051C
3.6.1 The results of the site-spacific sampling and testing program (see Section 4.7) - 3.6.2 The consideration of a leak before break concept in ((,N
/ addressing the impact of a high-energy line break (see Subsection 4.1.9)
\
3'6.3
. Wall Ql-647-13H-15 was previously identified as a nonsafety-related wall. However, further inspection has-revealed that this wall should be reclassified as a safety-related wall.
With the incorporation of the above, a total of 72 masonry walls are now considered to be safety-related with 51 of these meeting the acceptance criteria. 4.0 REEVALUATION OF MASONRY WALLS 4.1 POSTULATED LOADS The loads which were considered in the evaluation of each wall are identified in Table 3. 4.1.1 Dead Load (D) This load incluCes the dead weight of the wall and all permanently attached equipment, piping, conduit, and cable trays. The construction sequences have allowed the permanent dead load deflection to occur prior to the erection of the
/~s masonry walls. Therefore, the dead loads from the floor above
() are not transferred to the masonry walls. 4.1.2 Live Load (L) This load includes applicable live loads which can be transferred to the masonry wall through the floor framing. The live loads are not considered in those load combinations when they would relieve wall stresses. 4.1.3 Attachment Loads (Ro and R al l ! The attachment loads are localized loads which are a result of the reactions from the supports of piping, cable trays, conduits, HVAC ducts, and other systems. The reactions are determined for the normal operating or shutdown condition (Ro) and for the accident condition (Ra) which results from the thermal conditions generated by the postulated pipe break and includes R o. l 0051C 1
l [ 4.1.4 Wind Load (W) Exterior walls are subject to a uniform pressure load corresponding to the design wind speed. The design wind speed ()s ( is 110 miles per hour. 4.1.5 Tornado Load (Wt ) Exterior walls are subject to velocity pressures, differential pressures, and tornado missiles of the design tornado identified in the plant FSAR. The maximum tornado wind speed is 300 miles per hour. The maximum differential pressure is 170 psf. The following missiles are generated by the design tornado:
- a. A telephone pole 35'-0" long, with a butt diameter of 13 inches, a unit weight of 50 pcf. and total weight of 1,200 pounds, and having a velocity of 150 miles per hour
- b. A 1-ton mass with a velocity of 100 miles per hour and a contact area of 25 square feet The original design considered the buildings housing safety-related piping, conduit, cable trays, and equipment as sealed; therefore, tornado loadings do not affect interior walls.
4.1.6 Operatino Basis Earthquake (Eo)
) This load represents the seismic load generated by the operating basis earthquake (OBE). The design ground accelerations are as follows:
- a. Horizontal = 0.12 g
- b. Vertical = 0.08 g 4.1.7 Safe Shutdown Earthquake (Es)
This load represents the seismic load generated by the safe shutdown earthquake (SSE). The design ground accelerations are twice those shown for the OBE. 4.1.8 Thermal Loads (To and Ta) Thermal loads account for the effects of thermal gradients under normal operating (To) and accident (Ta) conditions. The operating loads represent the most critical steady-state condition, while the accident condition is a short-term thermal transient resulting from the postulated pipe leak, including 0051C
4.1.9 Hich-Enercy Pipe Break The high-energy piping systems outside of the primary containment were investigated and their proximity to the C-3 safety-related masonry walls was established. It was found that only a break in the reactor water cleanup system (RWCS) would impact the masonry walls. However, a break in this system is precluded by means of leak detection and administrative action. Room temperature monitors are capable of responding to small RWCS leaks by providing indication and alarm to the control /h\ room. At this time, the operators shall take the appropriate action to isolate the RWCS, thereby preventing a full pipe rupture. The analysis of the masonry walls in proximity to the RWCS addr'esset the effects of the postulated pipe leak by considering the thermal transient discussed in Subsection 4.1.8 and differential pressure (Pa). This load is represented by an equivalent static pressure across a wall. 4.2 ALLOWABLE STRESSES The allowable masonry stresses, excluding collar joint stresses, under normal load combinations are in accordance with those given by the Building Code Requirements for Concrete Masonry Structures (ACI 531-79) (Reference 6.1). Allowable stresses for extreme and abnormal load combinations are increased by a factor l of 1.67 over the above ACI code allowable stresses. l For the mortar collar joints, the allowable shear and tension s stresses are 5.4 psi for normal and 7.2 psi for abnormal and =La extreme environmental load combinations. Allowable stresses applicable to the different types of masonry are given in Table 2. 4.3 JUSTIFICATION OF THE REEVALUATION CRITERIA Except as noted, allowable stresses of masonry units and mortar are based on the code values as published in ACI 531-79. These values are considered reasonable and conservative. References to tests and other codes are provided in the Commentary to ACI 531-79. It is noted that the allowable stresses are used for the evaluation of existing masonry walls and not for the design of new walls. Because building codes do not address abnormal and extreme environmental conditions, a factor of 1.67 was used to provide i allowable stresses under these loading combinations. Based on available margins of safety, this factor is considered to be reasonable. l l 0051C l
Published data on tension and shear strength of collar joints are almost nonexistent. The ultimate collar joint shear stresses were determined by plant-specific in situ tests. The 'f)
/~* allowable stress, as given in Section 4.2, was obtained by k- applying a safety margin of three to the minimum test result.
Additional justification of the reevaluation criteria is provided in Appendix B. 4.4 SEQUENCE OF ANALYSIS Each wall is initially analyzed considering only dead and
. seismic loads or dead and wind loads, whichever appears most critical. For all walls which are found to be acceptable, the following applicable loadings are considered: live load, attachment loads, pipe leak loads, tornado loads, and interstory h3\
drift. I 4.5 METHOD OF ANALYSIS AND ACCEPTANCE CRITERIA 4.5.1 Stress Analysis Based on the walls' boundary conditions, each wall is idealized as either a cantilever, one-way strip, or two-way plate which is supported along at least two adjacent edges. The wall is then considered acceptable if all wall stresses under all load combinations are less than or equal to the established allowable stresses. 4.5.2 Stability and Sliding Analysis Cantilever walls which do not meet the acceptance criteria for allowable stresses are analyzed with regard to overturning ^ 3,\ stability and sliding movement. A factor of safety against overturning is determined for both OBE and SSE loads. The minimum acceptable factors of safety are 2.0 for OBE and 1.5 for SSE conditions. Before the wall is considered acceptable, the total wall movement, including rocking and sliding, must not adversely affect any safety-related items. Mortarfree cantilever walls are analyzed with regard to overturning and sliding movement. The minimum acceptable safety factor against sliding has been determined to be 1.5 for OBE and 1.0 for SSE conditions, based on a coefficient for static friction of u' = 0.33. i 4.5.3 Analysis of Archina Effects Masonry walls with mortared joints at both the top and bottom boundaries that do not meet the acceptance criteria for allowable stresses are investigated for arching effects. The wall's capability of resisting horizontal loads, after ultimate 7
' 0051C
A tension strenses are exceeded, is developed when tha wall jams f at the top and bottom against the supporting structural members. The center of the wall cracks due to tension stresses, rg and a three-hinged arch is formed to resist the loads through (/ compression stresses only. Design seismic loads generated by the safe shutdown earthquake are based on the peak acceleration of the applicable response spectra and the damping factor of 10% of critical. The stiffnesses of the wall and of the supporting elements are accounted for in the analysis. The deflection at the center hinge must be less than or equal to one third of the wall thickness. If an arching wall meets this requirement, it is considered acceptable when the compression stress developed in the arch is less than or equal to the allowable flexural compression stress shown in Table 2. 4.5.4 Interstory Drift Under Seismic Loads The effects of interstory drift are considered by determining the in-plane shear strain in the wall due to the relativa displacement between the top and bottom of the wall. The allowable in-plane strains equal 0.0001 of the wall height for unconfined walls and 0.001 of the wall height for confined walls. An unconfined wall is defined as a wall supported only on two adjacent sides. A confined wall is supported on any three sides or at the top and bottom of the wall (References 6.5, 6.6, and 6.7). These acceptance criteria are considered to be justified because none of the masonry walls carry a significant part of the l buildings' story shear or moment. Also, test data indicate that the gross shear strain of walls is a more reliable indicator for predicting the onset of cracking than loads or stresses. i The out-of-plane relative displacement creates a bending moment in the wall only in the case where the top and bottom boundaries are supported, and at least one represents a fixed condition. None of the masonry walls in the Quad Cities station are effectively fixed at the top or at the bottom. Therefore, the out-of-plane interstory drift is not considered. 4.6 ASSUMPTIONS AND ANALYSIS CONSTRAINTS The following assumptions and constraints were employed in the reevaluation of the masonry walls. I l 4.6.1 Nonsafety-related walls, anchor bolts, and embedments I were not within the scope of the reevaluation. 4.6.2 All loads and load combinations outlined in the plant FSAR are considered in the reevaluation. s 8 l 0051C i
A l 4.6.3 The seismic loads on masonry walls are dependent on the y damping characteristics of the material, which are expressed in percentage of critical damping as follows
.(References 6.3 and 6,.4):
- a. Uncracked Masonry Wall, Out-of-Plane Acceleration
- 1) OBE: 2%
- 2) SSE: 2%
- b. Piping Systems, Horizontal and Vertical Accelerations
- 1) OBE: 0.5%
- 2) SSE: 2%
The plant FSAR specifies damping of 0.5% under OBE conditions for vital piping systems. For the purpose of this evaluation, vital piping is defined as all safety-related piping.
- c. Other Attached Systems, Horizontal and Vertical Accelerations
- 1) CBE: 1%
I-
- 2) SSE: 2%
This category includes nonsafety-related piping and safety-related and nonsafety-related conduit,
- cable trays, and HVAC ductwork.
4.6.4 A masonry wall is considered an isotropic, elastic l material. Its natural frequency is calculated using standard plate formulas. For a wall with an opening, the calculated frequency is reduced by 9% if the size of the opening equals or is greater than 15% of the wall area. The reduction is proportionally less for a smaller opening. For multiple openings, the largest one is considered. To account for variation in stiffness and mass of the wall, the above frequency is varied by i 10% and the maximum response is used in the analysis. 4.6.5 In accordance with the plant FSAR, the effects of the seismic loads of one horizontal and the vertical direction are added arithmetically. 1 l ' ( 0051C 1 1
4.6.6 Daad loads from the floor above are not considered being transferred to the masonry walls. A part of the live load from these floors is transferred to the , ~ walls; however, it is not considered if it will relieve wall stresses.
'4.6.7 Shear and tensile stresses are not transferred across the continuous vertical mortar joints of walls laid in stack bond or the vertical mortar joints of a wall boundary adjacent to a concrete structural member.
4.6.8 Standard, prefabricated sections of the horizontal joint reinforcing steel are provided at all corners of masonry walls. However, their contribution to the strength capacity of this intersection is not considered. 4.7 MASONRY WALL TESTING PROGRAM A sampling and testing program was performed at the station. j This program provided the material properties necessary to e determine the allowable strest s applicable for the masonry wall l evaluations. The testing was also considered to fulfill the special inspection requirements of Reference 6.1, thus allowing the use of inspected allowable stresses. The findings of the program are as follows. 4.7.1 The hollow masonry block has an average compressive strength of 2,100 psi on the net area. 4.7.2 The solid masonry block has an average compressive /\ strength of 3,900 psi. i l 4.7.3 The mortar used in both the hollow and solid masonry 3 construction is, as a minimum, comparable to ASTM C 270, Type N. 4.7.4 The average unit weight of the hollow masonry is 97 pcf and the average unit weight for the solid masonry is 134 pcf. 4.7.5 In situ tests were performed on two walls to determine the strength of the mortared collar joint. The resulting failure stresses were 17.8 and 16.3 psi. 5.0 RESULTS OF MASONRY WALL EVALUATION ! Table 3 lists the results of the masonry wall reevaluation. The ! criteria used to justify the wall's acceptance or mode in which it does not meet criteria are identified. 10 O 0051C
5.1
SUMMARY
The following summarizes the results of the reevaluation of 72 safety-related masonry walls:
~]
5.1.1 Total number of walls meeting the acceptance criteria: 'A 51 5.1.2 Total number of walls which do not meet the acceptance criteria: 21
6.0 REFERENCES
6.1 Building Code Requirements for Concrete Masonry Structures, ACI S31-79, American Concrete Institute, Detroit, Michigan, 1979 6.2 USNRC IE Bulletin 80-11, dated May 8, 1980 6.3 Final Safety Analysis Report (FSAR) for the Quad Cities Nuclear Power Station Units 1 and 2 6.4 Damping Values for Seismic Design of Nuclear Power Plants, U.S. Nuclear Regulatory Commission Regulatory Guide 1.61, October 1973 6.5 Becica. I.J. and H.G. Harris, Evaluation of Techniques in the Direct Modeling of Concrete Masonry Structures, Drexel University Structural Models Laboratory Report M77-1, June 1977 *
)
6.6 Fishburn, C.C., Effect of Mortar Properties on Strength of Masonry, National Bureau of Standards Monograph 36. U.S. Government Printing Office, November 1961 6.7 Mayes, R.L.; Clough, R.W.; et al, Cyclic Loading Tests of Masonry Piers, 3 Volumes, EERC 76/8, 78/28, 79/12, l Earthquake Engineering Research Center, College of Engineering University of California, Berkeley, California 6.S 60-Day Report in Response to IE Bulletin 80-11 for the Quad Cities Nuclear Power Station Units 1 and 2, Commonwealth Edison Company Docket Numbers 50-254 and 50-265, dated July 3, 1980 ( ! 0051C l
O O O 1 i TABLE 1 i i MASONRY WALLS - PUNCTION AND PHYSICAL PROPERTIES ! Shown oo l Thick- Size Boundary Design i Wall Function ness Type Wythes Bond (height x width) Support Drawings Remarks _ b i QF6T7-leM 27 -~~ Partition -8" Solid 1 Running 15'-6"x21'-2" Yes l
?
~
Q2-647-9M-3 Partition 8" Solid 1 Running 15'-6"x21'-2" Yes ;
+
Q1-647-1911-11 Fire 12" Ilo110w 1 Running 18'-7"x8'-0" ; Yes 18 7
-7"x8'W" Yes Q2 66 M ll-12 Fire 12" llollow 1 Running l Q1-64 7-1311-15 Fire 12" Ilo11ow 1 Running 17'-0"x8'-10" I, . I Yes
/A I 1
Q1-611-14D-21 Fire 12" Ilo110w 1 Running 13'-5"x15'-8" , Yes 7 Q12 623-1911-28 Fire li" llollow 1 Running 22'-5"x8'-0" Yes
--~~
Q1-623-1811-29 Shielding 48" Solid 8 Running 20'-0"x9'-0" Yes Q1-623-18K-33 Shielding 12" Solid 2 Running 13'-6"xT' Ti* g Yes
--- * - r e.e e__
Q1-623-18K-34.-- - - - Shielding
-- 12" ---Solid 2 Running 13'-6"x9'-0" -
Yes BOUNDARY SUPPORTS l lFreeedge j fSimplesupport , 9
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O O O TABLE 2 ALLOWABLE STRESSES IN CONCRETE MASONRY WALLS Type 1 Wall Type 3 Wall Loadina Condition (l) Loading Condition (l) Type of Stress (psi) Normal Abnormal Normal Abnormal Flexural compression, Fm 340 560 410 680 Transverse and punching shear, Vm 35 59 39 66 Shear in mortar collar joint, Vmcj 5.4 7.2 5.4 7.2 Direct or Normal to bed joints, Fthn 14 23 -- -- flexural Hollow - Parallel to bed joints, Fthp 27 46 -- -- l' tension Normal to bed joints. Ptsn -- -- 27 46 Solid - Parallel to bed joints, Ftsp -- -- 40 68 Mortar collar joints, Ft c) 5.4 7.2 5.4 7.2 ] , Axial compression allowable (Fa) is' dependent upon the height and thickness of the wall Fa = 0.225 f6 [1 - ( h )3] 40t Type 1 Wall Type 3 Wall i l Hollow-unit wall Solid-unit wall fg = 1,020 psi fm= 1,240 psi mo= 750 psi mo= 750 psi
- 1. Abnormal loading condition includes accident and extreme environmental loads.
- 2. For walls laid in stack bond, shear and tensile stresses shall not be transferred across the l continuous vertical joints.
- 3. Material properties and the shear capacity of mortared collar joints have been verified by l field tests.
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O APPENDIX B ADDITIONAL JUSTIFICATION OF THE REEVALUATION CRITERIA O I t l l l l OOS2C 1
Appsndix B. Page 11 of 11 TABLE OF CONTENTS Paae
1.0 INTRODUCTION
1 2.0 ABBREVIATIONS 1 3.0 ALLOWABLE STRESSES 1 3.1 AXIAL COMPRESSION 1 3.2 FLEXURAL COMPRESSION 3 3.3 BEARING 3 3.4 SHEAR 3 3.5 TENSION 4 3.6 SHEAR AND TENSILE BOND STRENGTH OF MASONRY 6 COLLAR JOINT 4.0 IN-PLANE EVALUATION CRITERIA 7
4.1 INTRODUCTION
7 4.2 TEST RESULTS 8 5.0 ALTERNATIVE EVALUATION CRITERIA 8 5.1 ARCHING 8 5.2 ROCKING 9 5.3 SLIDING 9 (
6.0 REFERENCES
11 TAPLES B-1 Compressive Strength of Axially Loaded Concrete Masonry Walls B-2 Flexural Strength - Single Wythe Walls of Hollow Units, l Uniform Load, Vertical Span B-3 Flexural Strength, Vertical Span Concrete Masonry Walls, From Tests at NCMA Laboratory B-4 Flexural Strength, Horizontal Span, Nonreinforced Concrete Masonry Walls l I OOS2C
Appandix B Paga 1 of 13
1.0 INTRODUCTION
O The following discussions and test results are intended to provide additional justification of the reevaluation criteria for the safety-related masonry walls. This information has been > extracted from the references identified in Section 6.0. 2.0 ABBREVIATIONS Abbreviation Title ACI American Concrete Institute ASCE American Society of Civil Engineers ATC Applied Technology Council EERC Earthquake Engineering Research Center NBS National Bureau of Standards NCMA National Concrete Masonry Association 3.0 ALLOWABLE STRESSES 3.1 AXIAL COMPRESSION The objective was to develop reasonable and safe engineering 1 design criteria for nonreinforced concrete masonry based on all
- existing data. A review in 1967 of the compilation of all available test data on compressive strength of concrete masonry walls did not, according to some, provide a suitable relationship between wall strength and slenderness ratio. From a more recent analysis, it was noted in many of the 418 individual pieces of data that either the masonry units or mortar, or in some cases, both units and mortar, did not comply with the minimum strength requirements established for the materials permitted for use in " engineered concrete masonry" construction. Accordingly, it was decided to reexamine the data, discarding all tests which included materials that did not comply with the following minimum requirements
Compressive Strength Material (psi) Solid units 1,000 Hollow units 600 (gross) Mortar 700 O 0052C
Appendix B. Page 2 of 13 Also eliminated from the new correlation were walls with a slenderness ratio of less than 6; walls with an h/t ratio of less than 6 were considered to be in the category of " prisms".
- () For evaluation of slenderness reduction criteria, only axially loaded walls were used. The data that were available consisted of tests on 159 axially loaded walls with the h/t ratio ranging between 6 and 18. With this as a starting point, the data were analyzed assuming that the parabolic slenderness reduction function (1 - (h/40t)3] is valid.
The basic equation used to evaluate the test data was: f test = Co fk [1 -( h )3] (1) S.F. 40t f test
= Co x S.F. (2) fk [1 - ( 40t h )3]
C o x S.F. =K (3) where f6 - Assumed masonry strength, net area, based on strength of units f t est = Net area compressive strength of panel , S.F. = Safety Factor ! ( Co = Strength reduction coefficient h = Height of specimen, inches t = Thickness of specimen, inches l The net area used in the above formulae is the net area of the masonry, and does not distinguish between type of mortar bedding. In the evaluation, mortar strength was assumed to be constant and was not considered a significant influence on wall strength. It was determined that the objective of reasonable and safe criteria would be met if 90% of the K values were greater than the K value selected and gave a minimum safety factor of 3. Accordingly, the K values were listed in ascending order and the value satisfying the above conditions was K = 0.610 for the 159 tests as seen from Table B-2. Therefore, from Equation (3): () 0052C
Appsndix B, Page 3 of 13 Co x S.F. =K Co x 3 = 0.610 Co = 0.610 = 0.205 , 3 This value (0.205) agrees very closely with the coefficient 0.20 which had been used for a number of years with reinforced masonry design. An analysis of the safety factors present with the formula: h-)3) fs = 0.205 fk [1 -( 40t indicates the following: A safety factor greater than 3 is available in 93% of the tests, greater than 4 in 51% of the tests, greater than 5 in 15% of the tests, and greater than 6 in 5% of the tests. In ACI 531, the factor of 0.20 was increased to 0.225. The recommended value of 0.22 for unfactored loads has factors of safety comparable to those given above. 3.2 FLEXURAL COMPRESSION It is assumed that masonry can develop 85% of its specified compressive strength at any section. The recommended procedure () for calculating the flexural strength of a section is the working stress procedure, which assumes a triangular distribution of strain. For normal loads, an allowable stress of 0.33 fm has a factor of safety of 2.6 for the peak stress, which only exists at the extreme fiber of the unit and has been used in practice for many years. The recommended value for factored loads also only
- exists at the extreme fiber and is the value recommended in the ATC-3-06 provisions.
3.3 BEARING These values for normal loads are taken directly from the ACI 531-79 code. 3.4 SHEAR The most extensive review on shear strength literature appears to have been done by Mayes, et al (Reference 6.1), and published in Earthquake Engineering Research Center Report EERC 75-15 which was performed for both brick and masonry block. () 0052C
Appsndix B. Page 4 of 13 This report attempts to summarize some of the findings that appear to be pertinent towards defining permissible shear stress values that can be used for reevaluation of the nonreinforced () concrete masonry. A number of tests have been identified as being the primary basis for permissible shear stress values in both NCMA Specifications for the Design and Construction of Load-Bearing Concrete Masonry (References 6.4 and 6.5) and the ACI Standard Building Code Requirements for Concrete Maconry Structures, ACI 531-79 (References 6.2 and 6.3). Out-of-plane flexural shear is defined by the code (References 6.2 and 6.3) as equaling 1.1 vd5[. The derivation of this value is analogous to the permissible shear value of concrete, disregarding any reinforcement, of 1.ls/fe /h\ (Reference 6.30). Although this'is somewhat different (there is no tension steel by which to determine the appropriate j distance), the actual value is a mute point because tension will be the critical value for determining out-of-plane acceptability of a flexural member. Because of the nature of the stressas, however, and the various concerns with regard to the correctness of interpretation of the
. effects on boundary conditions, as well as such conditions as actual mortar properties, absorptivity of the mortar, confinement or lack of it on the test specimen during test, and arrangement and effect of actual load, it does not seem warranted to increase these stresses beyond a factor of 1.67
() under abnormal and extreme environmental loads. 3.5 TENSION 3.5.1 Normal to the Bed Joint A summary of the static monotonic tests performed to determine code allowable stress for tension normal to the bed joint was given in the NCMA specifications. Stresses for tension in flexure are related to the type of mortar and the type of unit (hollow or solid). Research used to arrive at allowable stresses for tension in flexure in the vertical span (i.e., tension perpendicular to the bed joints) consisted of 27 flexural tests of uniformly loaded single-wythe walls of hollow units. These monotonic tests were made in accordance with ASTM E 72. Table B-2 summarizes.the test results. From Table B-2, the average modulus of rupture for walls built with Types M and S mortar is 93 psi on net area. For Type N mortar, the value is 64 psi. Applying a safety factor of 4 to these values results in allowable stresses for hollow units as follows: () 0052C
App 3ndix B, Page 5 of 13 Mortar Tyne Allowable Tension in Flexure (Dsi) M&S 23 N 16 These values are consistent with those published in the 1970 ACI Committee 531 report, which have been only slightly altered in the ACI 531-79 code. Based upon these tests, the minimum factors of safety for each mortar type are: Mortar Tyne Factor of Safety M 3.87 i ! S 2.60 N 2.81 To establish allowable tensile stresses for walls of solid units, the 8-inch composite walls in Table B-3 were used. These walls, composed of 4-inch concrete brick and 4-inch hollow block, were greater than 75% solid, and thus, were evaluated as solid masonry construction. The modulus of rupture (gross area) for these walls averaged 157 psi, giving an allowable stress of 39 psi when a safety factor of 4 is applied. The composite wall tests in Table B-3 used Type S mortar. To establish allowable O stresses for solid units with Type N mortar, the mortar influence established previously for hollow units was used.
- 13 - 19
- f = 27 psi l
16 f The minimum factor of safety for these tests for Type S mortar was 2.33. Recent dynamic tests have been performed at Berkeley and the values of tension obtained at cracking at the mid-height of the walls are as follows: 13 psi, 20 psi, 23 psi, and 27 psi. The recommended values have a factor of safety of 2.8 with respect to the lower bound of the static tests for the unfactored loads and are towards the lower limit of the initiation of cracking for the dynamic tests. An increase of 1.67 appeared reasonable for factored loads based on the static tests. OOS2C
Appendix B, Page 6 of 13 3.5.2 Tension Parallel to Bed Joints Values for allowable tension in flexure for walls supported in (^/T
\- the horizontal span are established by doubling the allowable stresses in.the vertical span. While it is recognized that flexural tensile strength of walls spanning horizontally is more a function of unit strength than mortar, it is conservative to use double the vertical span values. Table B-4 lists a summary of all published tests and indicates an average safety factor of 5.3 for the 43 walls containing no joint reinforcement and 5.6 for the 15 walls containing joint reinforcement.
It is important to note that the factor of safety for those . walls loaded at the quarter points (Reference 6.6) have an average factor of safety of 2.02 with a minimum value of 1.22, while those loaded at the center had an average factor of safety of 6.08 with a minimum value of 3.59. However, it should be noted that the values tested at the quarter points were also tested at 15 days. t The results associated with tha early date of testing and the use of quarter-point loading are difficult to explain other than to state they are at variance with all othar test results. An increase in the allowable stresses by a factor of 1.67 is recommended for abnormal and extreme environmental loads. The recommended values could be increased because of the larger factors of safety in the test results; however, the value of O 1.67 was chosen to be compatible with the increase in other stresses for unreinforced masonry. 3.6 SHEAR AND TENSILE BOND STRENGTH OF MASONRY COLLAR JOINT The collar joint shear and tensile bond strength is a major factor in the behavior of multi-wythe masonry construction, particularly with respect to weak axis bending. A widely stated position is that for composite construction, the collar joint i must be completely filled with mortar. However, even if this I joint is filled, there must be a transfer of shearing stress l across this joint without significant slip in order for full composite interaction of the multiple wythes to be realized. Because the cracking strength, moment of inertia, and ultimate. flexural strength of the wall cross-section are significantly influenced by the interaction of multiple wythes, it is crucial to establish the collar joint shear bond strength. The only applicable published data on the shear bond strength of collar joints is that determined by Bechtel on the Trojan Nuclear Power Plant (Reference 6.29). Therefore, to correlate the shear bond strength of mortared collar joints, plant-specific in situ tests were performed in August 1982. The A results of these tests showed the ultimate failure stresses to G3 be 17.8 and 16.2 psi. A factor of safety of three was used in 0052C J
_ _ . _ _ _ _ ._. ~ ___ _ _- _ l Appandix B. Paga 7 of 13 determining the allowable stress for normal load combinations. For abnormal and extreme environmental combinations, the dhs allowable stress is increased by a factor of 1.33. 3 O There are conflicting data available on the relationship between the shear and tensile bond strengths. In most tests performed on mortar bed joints (couplet tects), the. shear bond strength was approximately twice the tensile bond strength. In a more , recent method of evaluation by means of centrifugal force, the shear bond strength was found to be 60% of the tensile bond strength (Reference 6.16). The authors of the report consider 4 the test procedure to be an improvement over present methods i because joint precompression is essentially eliminated as a result of the testing procedure. Because of the conflict in the test data, it is recommended that the values for tensile bond strength be the same as for shear bond. Unless metal ties are used at closely spaced intervals (less than 16 inches on center), it is recommended that their contribution to shear and tensile bond strength be neglected. 4.0 IN-PLANE EVALUATION CRITERIA
4.1 INTRODUCTION
Much of the effort to define a permissible in-plane shear stress j may be somewhat academic in that the normal case for
- . unreinforced walls being used in nuclear plant structures, the nature of the shear, is one of being forced on the structural !
panel as a result of being confined by the building frame and not one of depending on the panel to transmit building shear 4 forces. This forced drift or displacement results in shear stresses and strains, but because of the complex interaction between the panel and the confining structural elements, strain or displacement is a more meaningful index for qualifying the in-plane performance of the panel. In-plane effects may be imposed on masonry walls by the relative displacement between floors during seismic events. However, the walls do not carry a significant part of the associated story shear, and their stiffness is extremely difficult to define. In addition, because the experimental evidence to date demonstrates that the apparent in-plane strength of masonry walls depends heavily upon the in-plane boundary conditions, load or stress on the walls is not a reasonable basis for evaluation criteria. However, examination of the test data provided by the list of references of Section 4.2 indicates that the gross shear strain j of walls is a reliable indicator for predicting the onset of significant cracking. A significant crack is considered here to () OOS2C
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, APPandix B. Page 8 of 13
/A be a crack in the central portion of the wall extending at least 10% of a wall's width or height. Cracking along the interface between a block wall and steel or concrete members does not
() limit the integrity of the wall. 4.2 TEST RESULTS Test results indicate that to predict the initiation of significant cracking, masonry walls must be divided into two categories: 4.2.1 Unconfined Walls: Not bounded by adjacent steel or concrete priahry structure. Significant " confining" stresses cannot be expected. 4.2.2 Confined Walls: At a minimum, bounded top and bottom or bounded on three sides. For unconfined concrete block masonry walls, the works of Fishburn (Reference 6.18) and Becica (Reference 6.17), yield an
- allowable shear strain of 0.0001. It should be noted that 4
Fishburn's test specimens were an average of 15 days old. For confined walls, the most reliable data appears to be that of Mayes et al (Reference 6.20). In static and dynamic tests of masonry piers (confined top and bottom) varying block properties, mortar properties, reinforceroent, vertical load, and grout conditions, significant cracking was initiated at strains exceeding approximately 0.001. It should be noted here that () reinforcement can have no significant effect on the behavior prior to cracking. Similarly, the presence of cell grout should have no effect on stress or cracking in the mortar joints at a given strain. Both predictions are confirmed by the data in Reference 6.20. In addition, the data shows that the onset of cracking is not sensitive to the magnitude of initial applied vertical load. I Klingner and Bertero (Reference 6.19) performed a series of cyclic tests to failure and found excellent correspondence with a nonlinear analysis in which the behavior of an infilled frame
- prior to cracking is determined by an equivalent diagonal -
t strut. While the equivalent strut technique has been used by many investigators to study the stiffness and load-carrying l mechanisms of infilled frames, Klingner and Bertero found that the quasicompressive failure of the strut could be used to predict the onset of significant cracking. 5.0 ALTERNATIVE EVALUATION CRITERIA 5.1 ARCHING An extensive test program performed by Gabrielson (Reference 6.21) on blast laading of masonry walls provides validation of the concept of arching action of masonry walls () 0052C
Appendix B, Page 9 of 13 subjected to loads that exceed those that cause flexural cracking of an unreinforced masonry wall. An analytical ( procedure was developed to predict with reasonable accuracy the
\ ultimate capacity of the unreinforced walls tested.
5.2 ROCKING Freestanding block walls may rock or slide as rigid bodies during an earthquake. Such rocking and sliding of walls in nuclear plants is permissible as long as it is within certain tolerance limits. Only when the rocking of a wall increases to a critical value does the wall become unstable and overturn. A. freestanding wall starts to rock about an edge when the supporting floor moves horizontally with an acceleration greater than (t/h)g, where t = thickness of wall, h = height of wall, and g = acceleration due to gravity. If the coefficient of friction between the wall and floor is less than (t/h), the wall will not rock, but will slide instead. The rocking behavior of cantilever structures has been studied and reported in References 6.23, 6.24, and 6.25. In References , 6.24 and 6.25, a nonlinear differential equation for the rocking motion is formulated and solved numerically for different support excitations. Some test results on the rocking of block specimens are reported in Reference 6.24. The method used to predict the rocking of block walls is similar to the one in References 6.22 and 6.23 for cantilever structures. Application of the method to seismic rocking of structures has been O justified in Reference 6.26 based on the numerical results using ANSYS program. A rocking wall switches from one edge to another and a considerable amount of energy is dissipated whenever the wall impacts the floor. Thus, the seismic rocking behavior of a wall is nonlinear and the frequency of rocking varies as a function of the maximum rocking angle in a cycle (Reference 6.23). 5.3 SLIDING Sliding is the horizontal movement of a wall as a rigid body with respect to the supporting floor. In general, a wall will either rock or slide during an earthquake. It appears that a rocking wall will not slide and vice versa. Sliding resistance and sliding displacement of a wall depend on the coefficient of friction between the two contact surfaces. Based on the /$\ discussion in Reference 6.31, the following are reasonable friction values for concrete depending on the surface roughnesses: 0052C
Appondix B. Page 10 of 13 3 y = 0.33 -between smooth surfaces () y = 0.67 -between smooth and rough surfaces
= 1.0 -between rough surfaces y
Seismic sliding of cantilever structures is studied in Reference 6.28 by nonlinear seismic analyses using ANSYS ' program. This study substantiates the simple energy balance method given in References 6.22 and 6.27 to predict sliding. A wall begins to have sliding oscillations whenever the horizontal seismic floor acceleration in g-units exceeds the friction coefficient. 1 0 O O 0052C
Appandix Ei Page 11 of 13
6.0 REFERENCES
6.1 Mayes and Clough, " Literature Survey - Compressive, p/ s_ Tensile, Bond, and Shear Strength of Masonry," Earthquake
' Engineering Research Center University of California, 1975 6.2 ACI Standard, " Building Code Requirements for Concrete Masonry Structures" (ACI 531-79) 6.3 Commentary on " Building Code Requirements for Concrete Masonry Structures" (ACI 531,-79)
G.4 " Specification for the Design ind Construction of Load-Bearing Concrete Masonry " NCMA./1979 6.5 Research Data and Discussion Relating to " Specification for the Design and Construction oP Load-Bearing Concrete Masonry," NCMA, 1970 /
/
6.6 Fishburn, "Effect of Mortar, Strength and Strength of Unit on the Strength of Concrete! Masonry Walls," Monograph 36, NBS, 1961 - - 6.7 Copeland, R.E. and Saxer,,E.L., " Tests of Structural' Bond < of Masonry Mortars to Concrete Block," Proceedings, American Concrete Institute, Volume 61, Number 11, November 1964 - , m Richart, Frank E., Moorman, Robert B.B., and O 6.8 Woodworth, Paul M., " Strength and Stability of Concrete Masonry Walls," Bulletin 251 Engineering Experiment Station, University of Illinois, 1932 , 6.9 Hedstrom, R.O., " Load Tests.of Patterned Concrete Masonry Walls," Proceedings, American Concrete Institute, Volume 57, p 1265, 1961- - 6.10 Menzel,. Carl A., " Tests of the_ Fire / resistance and Strength of Walls of Concrete Masonry Units,i" Portland Cement Association, 1934
- 6.11 Nylander, H., " Investigation of the Strength of Concrete Block Walls," Swedish Cement Asso:iation. Technical Communications and Reports of Investigations, 1944, Number 6 (October) ,"
6.12 Copeland, R.E. and Timms A.G., "Effect of Mortar Strength and Strength of Unit on the Strength of Concrete Masonry Walls," Proceedings, American Concrete Institute, Volume 28, p 551, 1932 , i OOS2C
Appandix B, Page 12 of 13
-6.13 Beyer, A.H. and Krefeld, W.J., " Comparative Tests of Clay.
Sand-Lime, and Concrete Brick Masonry," Columbia University, Department of Civil Engineering, April 1923 O 6.14 Livingston, A.R., Mangotich, E., and Dikkers, R., " Flexural Strength of Hollow Unit Concrete Masonry Walls in the Horizontal Span," Technical Report 62 NCMA, 1958 6.15 Cox, F.W. and Ennenga, J.L., " Transverse Strength of Concrete Block Walls," Proceedings, ACI, Volume 54, p 951, 1958 6.16 Hatzinkolas, M., Longworth, J., and Wararuk, J.,
" Evaluation of Tensile Bond and Shear Bond of Masonry by Means of Centrifugal Force," Alberta Masonry Institute, Edmonton, Alberta 6.17 Becica, I.J. and Harris, H.G., " Evaluation of Techniques in the Direct Modeling of Concrete Masonry Structures," Drexel University Structural Models Laboratory Report M77-1, June 1977 6.18 Fishburn, C.C., "Effect of Mortar Properties on Strength of Masonry," National Bureau of Standards Monograph 36, U.S. Government Printing Office, November 1961 6.19 Klingner, R.E. and Bertero, V.V., " Earthquake Resistance of Infilled Frames," Journal of the Structural Division, ASCE, June 1978 6.20 Mayes, R.L., Clough, R.W., et al, " Cyclic Loading Tests of Masonry Piers," 3 volumes, EERC 76/8, 78/28, 79/12.
Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley, California 6 31 Gabrielson, G. , Wilton, C., and Kaplan, K., " Response of Arching Walls and Debris from Interior Walls Caused by Blast Loading," URS Report 2030-23, URS Research Company, 1975 6.22 Topical Report, " Seismic Analyses of Structures and Equipment for Nuclear Power Plants," BC-TOP-4, Revision 4 i Bechtel Power Corporation, 1980 6.23 Housner, G.W., "The Behavior of Inverted Pendulum Structures During Earthquakes," Bulletin of the Seismological Society of America, Volume 53, Number 2, February 1963 6.24 Aslam, M., et al, " Earthquake Rocking Response of Rigid Bodies," ASCE, Journal of the Structural Division, ST2, February 1980 ( 0052C , l l
Appandix B, Page 13 of 13 6.25 Yim, C-S., et al, " Rocking Response of Rigid Blocks to 4 Earthquakes," Report UCB/EERC-80/02, University of California, Berkeley, January 1980 6.26 " Seismic Loading Criteria for Base Mat Design," Bechtel Power Corporation. San Francisco, Internal Report, Revision 2 November 1976 6.27 Newmark, N.M., " Effects of Earthquakes on Dams and Embankments," Geotechnique, Volume XV, Number 2, pp 139-159, June 1965 6.28 Kausel E.A., et al, " Seismically Induced Sliding of Massive Structures," ASCE, Journal of the Geotechnical Engineering Division, GT12 December 1979 6.29 Report on-Tests of Shear Strength of Collar Joint Mortar in Double Wythe Masonry Walls, Trojan Nuclear Power Plant, Portland General Electric Company, April 14, 1980 6.30 ACI Standard, " Building Code Requirements for Structural Plain Concrete" (ACI 322-72) 6.31 PCI Design Handbook, " Precast Prestressed Concrete," k Prestressed Concrete Institute, Second Edition, 1978 O l l l 1 OOS2C
s
'Shstt 1 of h
...: . . s. s-TABLE B-1 COMPRESSIVE STRDIGTH OF AXIALLY LOADED CON 0' TETE MASOIIRY WALLS Concrete Masonry Units '
Mortar Walls Strength, Strength,
, Percent psi, net Str., psi, net Ref. Solid area ff, psi psi Bedding h/t f test f' C K S.F.
6.8 63 1160 980 1180 Full 6.0 750 978 .798 3.83 63 1160 980 1180 Full 6.0 685 978 .701 3.49 63 1160 980 1160 FS 6.0 670 978 .686 3.42 63 1160 980 900 FS 6.0 555 978 .568 2.83 63 1200 1000 1230 Full 6.0 860 995 .863 4.30 63 1200 1000 730 Full 6.0 625 995 .627 3.12 63 1200 1000 960 FS 6.0 580 995 .582 2.89 63 1200 1000 780 FS 6.0 650 995 .652 3.25
. 63 1320 1060 880 Full 6.0 1110 1055 1.050 '5.25 63 1320 1060 810 Full 6.0 970 1055 .918 4.58 63 1320 1060 810 FS 6.0 780 1055 .738 3.69 63 1160 980 1080 Full 6.0 800 978 .818 4.CS
( ) 63 1160 980 1080 Full 6.0 670 978 .686 3.42 63 1810 1275 1270 Full 6.0 940 1270 .739 3.67 63 1810 1275 1270 Full ; 6.0 940 1270 .739 3.67 63 1505 1150 1670 Full ; 6.0 825 1145 .719 3.60 63 1505 1150 1670 Full ,' 6 . 0 820 1145 .715 3.57 63 1240 1020 980 Full 6.0 1010 1015 .993 4.95 63 1240 1020 980 Full l 6.0 870 1015 .856 4.26 ' 63 1720 1230 880 Full i 6.0 1035 1225 .844 4.21 63 1720 1230 880 Full ! 6.0 940 1225 .766 3.81 63 1380 1090 1730 Full i 6.0 1000 1085 .920 4.58 63 1380 1090 1730 Full 6.0 1010 1055 .930 4.63 63 1780 1262 1870 Full 6.0 1450 1257 1.152 5.75 63 1780 1262 '1870 Full ! 6.0 1570 1257 1.248 6.22 43 3300 1790 1230 Full ! 6.0 1560 1782 .874 4.36 43 3300 1790 1230 Full ' 6.0 1730 1782 .969 4.8L 70 1645 1208 1140 Full . 6. 0 1000 1200 .830 4.15 70 1645 1208 1140 Full i 6.0 1220 1200 1.013 5.06 i
$.12 '
63 509 453 3140 Full 6.0 303 455 .664 3.30 63 509 458 1610 Full , 6.0 295 455 .646 3.21 63 509 458 1060 Full ! 6.0 295 455 .646 3.21 63 840 756 3140 Full 6.0 532 753 .706 3.52 63 840 756 1610 Full 6.0 560 753 .716 3.52 63 840 756 1060 Full 6.0 505 753 .670 3.35 63 875 788 3140 Full ; 6.0 4 3P. 785 .558 2.79 ("N s_,g f
Sheet 2 of k Table B-1 (continued) Concrete Masonry Units Mortar Walls () Strength. Percent psi, net Str., Strength, psi, net Ref. Solid area ff, psi psi redding h/t feest f4 C K S.F. 63 875 788 1610 Full 6.0 430 785 .547 2.74 6lle 63 875 738 1060 Full 6.0 500 785 .637 3.17
, 63 1080 940 3140 Full 6.0 605 936 .646 3.22 63 1080 940 1610 Full 6.0 715 936 .763 3.81 63 1080 940 1060 Full 6.0 765 936 .817 4.07 63 1230 1015 3140 Full 6.0 1160 1010 1.146 5.70 63 1230 1015 1610 Full 6.0 1000 1010 .988 4.92 63 1230 1015 1060 Full 6.0 1110 1010 1.097 5.46 63 1410 1105 3140 Full 6.0 1140 1100 1.030 5.16 63 . 1410 1105 1610 Full 6.0 985 1100 .893 4.45 63 1410 1105 1060 Full 6.0 1030 1100' .935 4.66 63 1520 1157 3140 Full 6.0 660 1152 .572 2.85 63 1520 1157 1610 Full 6.0 740 1152 .642 3.20 .
63 1520 1157 4780 Full 6.0 830 1152 .719 3.58 63 1860 1295 3140 Full 6.0 1476 1290 1.143 5.70 63 1860 1295 1610 Full 6.0 1539 1290 1.192 5.94 63 1860 1295 1060 Full 6.0 1365 1290 1.058 5.27 63 2510 1554 3140 Full 6.0 1698 1550 1.096 '5.47 63 2510 1354 1610 Full 6.0 1365 1550 .881 4.39 63 2510 1554 1060 Full 6.0 1325 1550 .856 4.27 63 3030 1710 3140 Full 6.0 2222 1705 1.304 6.50 63 3030 1710 1610 Full 6.0 2222 1705 1.304 6.50 (]) 63 3030 1710 1060 Full 6.0 1984 1705 1.164 5.80 63 3740 1923 3140 Full 6.0 1857 1918 .969 4.82 63 3740 1923 1610 Full 6.0 2523 1918 1.316 6.56 63 3740 1923 4780 Full 6.0 2317 1918 1.209 6.03 63 6640 2400 3140 Full 6.0 3587 2392 1.499 7.48 63 6640 2400 1610 Full 6.0 3856 2392 1.612 S.04 63 664Q 2400 4780 Full 6.0 5031 2392 2.102 10.49 6 13 100 1383 1$57 2562 Full 7.0 1140 1254 .910 4.13 100 1388 1640 3017 Full 7.0 1358 1635 .830 4.57 100 1892 1853 2317 Full 7.0 1469 1846 .795 4.52 100 1923 1630 2153 Full 7.0 1394 1625 .858 4.29 100 2508 2390 2427' Full 7.0 1947 2300 .817 4.56 100 2529 2630 2347 Full 7.0 2151 2620 .820 4.68 100 2545 2130 2143 Full 7.0 1930 2120 .909 4.17 100 2610 2220 3195 Full 7.0 2078 2210 .939 4.71 100 2678 2030 2322 Full 7.0 1832 2020 .905 3.99 100 4474 2210 2792 Full 7.0 1810 2200 .821 4.10 100 4474 2540 2154 Full 7.0 2157 2530 .937 4.09
** fd values frem this reference were determined from prism tests in-stead of assumed values. Test results multiplied by factor of 1.2 ,
I I O l
.~
~ - ~ ~ ~ ~
q .*
. Shest 3 of k Table B-1 (continued)
Concrete Fbsonry Units Mortar Walls Strength, Strength, Percent psi, net Str., psi, net Ref. Solid area fE, psi pai Bedding h/t f test ffC K S.F. 6.10 62 2547 1556 1400 FS 9.0 1241' 1540 .807 4.05 62 1886 1305' 1400 FS 9.0 1153 1290 .E34 4.50 62 1999 1350 1400 FS 9.0 967 1335 .724 3.63 62 1499 1150 1400 FS 9.0 685 1135 .603 3.02 62 1934 1325 1400 Full 9.0 1354 1310 1.033 5.19 62 2305' 1473 1400 FS 9.0 1096 1455 .752 3.78 62 2136 1405 1400 FS 9.0 1128 1390 .812 4.07 62 1773 1250 1400 FS 9.0 1088 1245 .873 4.38 62 1298 1049 1400 FS 9.0 854 1037 .823 4.14
. 62 1241 1031 1400 FS 9.0 685 1010 .678 3.41 62 1612 1196 1400 FS 9.0 991 1180 .838 4.20 62 1805 1273 1400 FS 9.0 1088 1260 .864 4.33 62 1491 1146 1400 FS 9.0 854 1133 .754 3.78 62 1088 944 1400 FS 9.0 629 933 .673 3.38 62 1918 1318 1400 FS 9.0 1072 1302 .822 4.12 62 1169 985 1400 FS 9.0 605 975 .621 3.12 45 2655 1598 1400 FS 9.0 989 1578 .626 3.15 62 1088 944 1400 FS 9.0 564 933 .604 3.03 62 1290 1045 1400 FS 9.0 701 1032 .678 3.41 62 1999 1350 1400 FS 9.0 1104 1335 .826 4.16 O ,
62 1862 1296 870 1400 1400 Full Full 9.0 9.0 1378+ 1280 1.075 758 860 .881 4.42 5.44+ 62 967 62 1967 1338 1400 Full 9.0 1241 1320 .938 4.72 6.10 57 2280 1463 1400 FS 9.3 1228 1450 .849 4.27 67 1917 1318 1400 FS 9.3 836 1302 .642 3.23 67 13.80 1090 1400 FS 9.3 724 1078 .672 3.37 67 1902 1312 1400 FS 9.3 1223 1300 .943 4.74 j 67 1246 1023 1400 FS 9.3 739 1010 .731 3.67 ! 57 2087 1386 1400 FS 9.3 1193 1370 .871 4.38 57 2087 '1386 830. FS 9.3 1298 1370 .948 4.76 57 2385 1505 1400 FS 9.3 719 1485 .484 2.44 57 2385 1505 1400 FS 9.3 789 1485 530 2.67 57 2385 1505 1400 FS 9.3 1105 1485 .743 3.74 57 2385 1505 1400 FS 9.3 1140 1485 .766 3.85 6.8 39 1590 1187 1130 Full 9.5 885 1170 .756 3.79 39 1590 1187 1010 . Full 9.5 1000 1170 .853 4.28 39 1718 1238 1070 Full 9.5 949 1220 .777 3.89 39 1718 1238 840 Full 9.5 910 1220 .745 3.73
~
I . O
- --~
.. , q Sheet h of h )
I Table B-1 (continued) () Concrete Masonry Units Strength, Mortar Strength, Walls ; i I Percent psi, net Str., psi, net ff, psi psi Bedding h/t f eest f' C K S.F. Ref. Solid area 6.8 63 1159 985 1180 Fuli 14.3 683 940 .726 3.62 63 1159 985 1440 Full 14.3 690 940 .734 3.66
. 63 '1159 985 1440 Full 14.3 738 940 .784 3.91 '
63 1159 985 1060 FS 14.3 532 940 .565 2.82 y 63 1159 985 900 FS 14.3 563 940 .599 2.98
. 63 1159 985 1920 FS 14.3 563 940 .599 2.93 63 1206 1020 1230 Full 14.3 738 974 .758 3.80 63 1206 1020 730 Full 14.3 683 974 .702 3.51 63 1206 1020 1130 Full 14.3 746 974 .765 3.83 63 1206 1020 960 FS 14.3 571 974 .586 2.94 63 1206 1020 780 FS 14.3 603 974 .619 3.10 63 1206 1020 1250 FS 14.3 595 974 .610 3.05 63 1317 1080 880 Full 14.3 905 1030 .877 4.38 63 1317 1080 750 Full 14.3 1063 1030 1.030. S.14 63 1317 1080 810 Full 14.3 929 1030 .901 4.49 63 1317 1030 1020 FS 14.3 714 1030 .692 3.45 63 1317 1080 1020 FS 14.3 667 1030 .647 3.23 63 1159 985 1120 Full 14.3 579 940 .616 '3.07 63 1159 985 1150 Full 14.3 635 940 .675 3.37 63 1159 985 1080 Full 14.3 635 940 .675 3.37
() 63 63 1810 1810 1274 1274 12,70 940 Full Full 14.3 14.3 873 881 1218 1218
.717
.725 3.54 3.58 63 1810 1274 1120 Full 14.3 817 1218 .671 3.32 63 1508 1153 1380 Full 14.3 706 1100 .641 3.17 63 1508 1153 1380 Full 14.3 746 1100 .677 3.34 63 1508 1153 1670 Full ,14.3 643 1100 .584 2.88 63 1238 1025 1920 Fuli 14.3 833 978 .851 4.24 63 1238, 1025 980 Full 14.3 802 978 .819 4.09 63 1238 1025 1280 Full 14.3 817 978 .835 4.16 63 1714 1230 800 Full 14.3 1111 1172 .946 4.73 63 1714 1230 800 Fuli 14.3 1127 1172 .959 4.79 63 1714 1230 750 Full l14.3 1079 1172 .918 4.59 63 1381 1090 1730 Full 14.3 968 1040 .930 4.64 3
63 1381 1090 3 2200' Full 14.3 960 1040 .923 4.61 63 1774 1245 2100 Full 14.3 1240 1190 1.043 5.21 63 2253 1450 12'30 Full 14.3 936 1385 .675 3.42 63 2253 1450 1270 Full 14.3 920 1385 .664 3.37 70 1643 1206 1180 Full 14.3 807 1150 .701 3.55 1150 .857 4.33 70 1643 1206 1300 Full l14.3 986 .732 3.66 55 1273 1040 1220 Full 114.3 727 993 3.84 55 1273 1040 1220 Full l14.3 764 993 .770 100 2900 1665 1475 Full 15.0 1250 1565 .801 3.93 65 1746 1250 ! 1400 Full l18.0 1108 1135 .975 4.87 6.10 4.25 () g 65 65 1246 1562 1015 l1400 1175 !1400 Full {18.0 785 Full (18.0 1203 925 .850 1065 1.131 5.66
. ~ =: -- ~ z = - -
r . j
- - .- Shaet 1 of 1 TABLE B-2 O
FLEXURAL STRENGTH--SINGLE WYTHE WALLS OF HOLLOW UNITS-UNIFORM LOAD--VERTICAL SPAN Mortar Type Proportion Modulus of Rupture ASTM C 270 psi, Net Area Reference M 110 6.7 M 108 NCMA M 102 6.7 M 97 6.7 M 95 RC1% S 94 NCMA 91 NCMA M 89 NCFA M N 88 6.9 S 84 6.7 83 NCMA S S 81 6.7 75 NC)M . 5 69 NCMA S N 67 6.9 6.9 O~ N 62 6.7 S 60 N 58 6.9 45 9 N g.7
+
0 60 41 6.9 0 0 36 6.9 0 36 6.9 33 6.9 0 32 6.9 0 30 6.7 0 6.9 0 ' 27 O em w e eroe y. .. we ,m- e-anam -
* *
- w *e e e
TABLE B-3
*Sheat 1 of 1 TLtXURAL STREXCTH, VERTICAL SPAN COXCRETE 2MSONRY WALLS FRO'l TESTS AT KCMA LABORATORY Modulus of Rusture Vet Max. Net Hortar MTM Nominal
- Uniform Section Cross Bedded Mortar Thickness . Load Mod lus Area, Type
- in.
psf. in 3/ft Area, psi .! psi Monowythe Walls of Hollow Units M 8 85.15
- 80.97 61.74 88.73 M 8 --
87.10 80.97 63.15 90.76 M - 8 91.00 80.97 65.97 f 94.82 M 8 103.35 80.97 74.93 l 107.69 , 62.40 45.24 ! S 8 80.97 69.47 S 8 72.15 80.97 52.31 l 75.18 s 12 . 183.3 164.64 57.11 , 93.94 S ~ 12 161.2 164.64 50.22 . 82.62 I Composite Walls of Concrete Brick & Hollou CHU 5 -- 4 8 222.3 103.82 161.16' 180.67 5 8 219.7 103.82 159.29 : 178.55 l 5 8 187.2 78.16 135.72 : 202.09 ! S 8 228.8 103.82 165.88 185.95 i S 8 216.4 78.16 158.34 , 235.77 l 162.11 241.33 ! S 8 223.6 78.16 , S 12 171.6 139.83 53.46 103.55 ! , S 12 150.8 139.33 46.98 91.00 l S 12 156.0 139.83 l 48.60 94.14 8 5 12 .. 213.2 139.83 66.42 , 128.66
. Cavity Valls .
S 10 - - 98.8 . 50.35 158.62 165.55 !
$ . 10 156.0 50.36 250.44 261.38j S. 10 88.4 48.16 141.91 154.88 3 S 10 119.6 .
50.3G 192.01 200.40 i S 10 , 114.4 50.36 183.66 101.63 . S 10 109.2 ~8 - 40.16 175.30 391.32 ' S 12(4-4-4) i 145.6~ I 50.3G 233.73 213.9*.i S 12(4-4-4) ! 145.6 1 50.3G 233.73 213.94 , O = S 12cs-2-4) 12(6-2-4) 135.2 119.6 i 77.co 77.c0 127.as 112.68 2:5.c2 - 329.70 g __ 1-
- Mortar type by yiop ion requirements
* ' t, , - -
.. Sheet 1 of 2 O TABLE B h FLEXURAL STRENGSI, HORIZONTAL SPAN, NO"R"INFORCED CONCRETE MASONRY WALLS
- Modulus **
Mortar Leading of Rupture
- Construction Type Type psf l Net Area; psi Act./ Allow Ref.
Monowythe 8" N Uniform 127 132 4.13 1.6.9 Hollow, 3-Core N' 136 141 4.41 6.9
- N 127 132 4.13 6.9 N "
169 176 5.50 6.9 N 173 180 5.63 6.9 O 123 128 4.00 6.9 0 158 164 5.13 6.9 Monowythe 8" N 149 155 4.84 6.9 Hollow, Joint N 160 166 5.19 6.9
" 201 6.28 6.9 Reinf. @ 16 in.cc N 193 6.9 0
150 156 4.88 0 " 186 193 6.03 6.9 203 211 6.59 6.9 Monowythe 8" N 6.9 196 204 6.38 O Ho11cw Joint N 6.56 6.9 O Reinf. @ 8 in.cc 0 " 202 210 6.9 0 195 203 6.34 58 1.81 6.6 Monowythe 8" N 1/4 pt 56
" 1.22 6.6 Hollow N 38 39
" 1.97 6.6 N 61 63
" 1.94 6.6 N 60 62
" 71 2.22 6.6
*N 69 6.6 N
93 96 3.00 Center 199 217 4.72 6.15 8" Monowythe M M 176 192 4.17 6.15 Hollow, 2-Core 151 165 3.59 6.15 M . 111 210 4.57 6.15 4-2-4 Cavity M 6.15 Wall, Hollow M-135 255 5.54
" 95 180 3.91 6.15 Units M 8" Monowythe M "
159 173 3.76 6.15 Hollow 2-Core M " 159 173 3.76 6.15 Joint Re. @ 8"oc M " 191 208 4.52 6.15 l 4-2-4 Cavity ofl M " 159 300 6.52 6.15 l " 6.52 Hollow Units Tied M 159 300 6.15 w/ Joint Re. 3 8"oc M 159 300 6.52 6.15
Sheet 2 of 2 O E Table B-b (centinued)
..;y - Modulus
'~
I.oading ** Mortar of Rupture Construction Type ' Type psf ?fet Area; psi ;Act/ Allow i . Pef 4" Hollow N Center 138 365 11.41 6.1h 3 . '- " Monowythe N 157 415 12.97 6.1h
" 268 8.38
- N 101 , 6.1h
, 8" Hollow M "
268 20'2 4.39 6.1h Monowythe' M " 314 237 5.15 6.1h M. 314- 237 5.15 6.1h 8" Hollow N '" 277 210 6.56 6.1h Honowythe N " 314 237 7.41 6.1h N " 314 237 7.41 6.1h , 8" Hollow 0 " 259 195 6.09 6.1h Monowythe 0 277 210 6.56 6.lb
" 210 6.56 0 277
. . 6.1h 8" Hollow M " 268 202 4.39 6.1h Monowythe M "
297 224 4.87 6.14 M " 277 210 4.56 6.1h O
" 6.1h 8" Hollow N 277 210 6.56
* " 195 6.09 6.1h Monowythe N 259
" 224 7.00 N 297 6 1h
" 8.45 6.1h 8" Hollow 0 360 271
" 224 7.00 6.1h Monowythe 0 297
" 202 6.31 6.1h 0 268
" 4.44 6.1h 12" Hollow N 352 142 Honowythe N "
314 127 3.97 6.1h N ," 333 134 4.19 6.1h l ~O e *- == = * * * - + 7 , w, _. _ , - - - + - _ _ _ _ _ _ _ -}}