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~CRITERIATOR*tO.wru.1[MCh'OR~ INSTALLATIONS
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w.m.b.ISIAB. . .; . . , . . . w . ;UiNYON YOWER' PLANT M *" .- *, '.
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'y Prepared'3y: N g
Approved By: au s'
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4 Revision: 2 Date* 12/10/76 I .
M PURPOSE .
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This procedure will' develop inspection triteria that can be used to
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M . evaluate concrete anchor instaM =+4nns.in the. field. . .. .
O o SCOPE -
- g- This procedure win determine minimum acceptance criteria for misinstau ed concrete anchors for the fenewing conditions in nominal 3,000 psi design concrete:
(1) wedge plugs not driven funy, (2) field modified anchors, (3) angular misalign-ment, and (4) effects of overembedment on shear strength.
This procedure win test 1/2", 5/8", 3/4" and 7/8" concrete anchors (flush shell type) aanufactured by both the Phillips Drin Co=pany, Inc. and the Hilti Corporation.
TEST PROCEDURE A. TEST TIXTURE The test fixture censists of a base, support structure, hydraulic cylinder with a honow ram, pressure gauge, hand operated hydraulic pump, hydraulic hose and threaded rods of required sizes to fit anchors. (See Figure 1)
Also, a dial indicator with a magnetic base and various accessories to measure ancher' movement win be used.
B. CALIBRATION OT TIST T!XTURE
- 1. Assemble the hydraulic cylinder, hand pump, pressure hose and calibrated pressure gauge.
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lab, detemine the load applied ~ by the cylindr* at various pressure readings as read-on,the -pressure 3;auge. Record data
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.on Data Sheet.No. 1, "Hydraulic Cy13.nder Force." '
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NOTE: Mr.ke ten calibration runs. At each pressuie
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plateau, record thu hydr'aulic pressure and applied force.
Average the ten retdings at each pressure plateau and plot -
- the average value on Figure 2..
M 3. Using the data from Data Sheet 1, develop a curve for Figure 2 "Cylinder Force vs. Hydraulic Pressure." , .
7 C. GENERAL TEST INSTRUCTION ,
M 1. Install anchor of type and size requirstd for testing.
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~I 22. Poil. tion test fixturelever embedded anchor and *;
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anchor with threaded rod.cf +equired size. .
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o~ 3. Position' dial indicator to detect anchor movement. The dial indicator should contact the shoulder of the anchor if possible.
O Use the dial indicator accessories, (i.e. magnetic base and
- p extension rods) as required to assure that equipment deflection V. and rod stretch is not affecting the dial indicator. ,
- 4. Increase hydraulic pressure until the dial indicator detects movement of the anchor. Record hydraulic pressure on applicanle Bata sheet at.which movement is detected.
Continue increasing hydraulic pressure until one of the following
- 5. '
conditions exist:
- a. the anchor has slipped five percent of the minimum embedment depth,
- b. the concrete cracks, or
- c. the anchor breaks.
Record on applicable data sheet.
- 6. Vent hydraulic pressure and remove test apparatus.
- 7. Using I'igure 2, "Cylinder Force vs. Hydraulic Pressure,"
' determine load' applied to anchor at which anchor movement is detected. Record the force on the applicable data sheet.
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Unmodified *Hilti Anchors -
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'i 1.1 Plug Depth Before Dr.iiring -
- a. For each size of Hilti anchors, iselect ten at random.'
N b. Insert the expansion plug (by hand) as far as possible.
Tap the plug lightly to assure it is seated on it's i taper.
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- c. Measure and record the distance from the threaded end
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shoulder to the top of the plug on Data Sheet No. 2
- for ten anchors. ,
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.y- d. From the data obtained, determine the average dimen-sion ,that. the plug can be inserted for each . size N r c r -
I L . .. of Rilti anchors and record an Data Sheer.No.. 2.; .. > , .
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1.2 MM-= Depth of . Expansion Plug to Meet Design. Load O *
- a. Drill holes in 3,000 psi concrete of the required o diameter for each size of Hilti anchors to depths at which the anchors will be flush with the surface g of the concrete.
- b. Install anchor and drive the expansion plug 1/8".
Record on Data Sheet No. 3.
NOTE: The depth of the expansion plug is determined by subtracting the average dimension for each si:e of Hilti ancher (obtained in Section 1.1) from the distance of the plug to the anchor threaded ,
end shoulder after driving. .
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- c. Perform pull test on anchor and record data at which anchor movement (or failure) is detected on Data Sheet 3. Record the pressure for both initial move-ment of the anchor and when the anchor has been dis-placed five percent of minimum embedment.
NOTE: The following are minimum acceptable values for anchor strengths, both for PHILLIPS and HILTI anchors. They are 10% greater than Table A values for 1,000 psi concrete in PGCE Engineering Standard No. 054162, Revision 2.
Anchor'Si:e Hin. Acceptable Torce 1/2" 965 lbs.
5/8_" 1,650 lbs.
3/4" 2,585 lbs.
7/8" 3,685 lbs.
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- acceptable force is not met, remrr':he test-with the anchor expansion' plug driven deeper. Increase plug depths in 1/8" increments. Use a new anchor, ex-pansion plug and' hole for each test.
tO e. If the minimum pull-out force .is exceeded, run four mot-e anchor pull tests with the plug driven the same minimum amount. Record data on Data Sheet No. 3.
NOTE: Five consecutive pull tests at a m selected expansion plug, depth must pass the minimum
- acceptable pull-out force before this plug depth can be established as a minimum field inspection criterion.
1 If, during testing, any anchor fails at the selected plug, depth, this* depth is not satisfactory and the
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next deeper increment.uust be tested.
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- ' h. "Determine the minimum expansion plug-depth :for21/2"i
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.To 5/8" and 3/4" HILTI. Anchors and record findings on
- g ~Da*a Sheet No. L g .g. After once having detemined the minimum plug depth to meet design load for each size of ancher, drive the expansion plug deeper in 1/8" increments and per-Lq y, fem a pull test at each deeper increment until 300% design load is reached. Record infomation on Data Sheet No. 3.
- h. ~ Tor each anchor size, drive the expansion plug fully j one time and test per above. Record findings on Data ;
Sheet No. 3. I 2.0 Unmodified Phillips Anchors 2.1 Plug Depth Before Driving ,
NOTE: Use Phillips test gauge as shown in Figure l 3 for each size of Phillips anchors for measurements. l
- a. Select ten Phillips anchors. Insert the expansion plugs (by hand) as far ac possible. Tap the plug lightly to assure that it is seated on it's taper.
- b. Insert test gauge in each selected anchor and measure from the top of the expansion plug to the shoulder of the test gauge. Record the infoma, tion on. Data !
Sheet No. 2.
NOTE: It is extremely important that the test gauge be inserted as far as possible when ob-l taining measurements to assure that the test gauge g is at the end of the threaded section.
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- acceptablo force is not het, rerun < the test with -the anchor expansion' plug driven deeper. Increase plug depths in 1/8" increments. Use a new anchor, ex-pansion plug and' hole for each test.
Q3 e. If the minimum pull-out force is exceeded, run four
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more anchor pull tests with the plug driven the same minimum amount. Record data on Data Sheet No. 3.
NOTE: Five consecutive pull tests at a m selected expansion plug depth must pass the minimum
- acceptable pull-out force before this plug depth can be established as a minimum field inspection criterion.
1 If, during testing, any anchor fails at the selected
,,,_' plus depth, this* depth is not satisfactory and the next deeper increment.must be tested.
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'Detemime %e minimum expansion plug-depthfor-4./2"i --
M S/8" and 3/4" RILTI . Anchors and record findings on
~ Data Sheet No. 3. .
g .g. After once having determined the minimum plug depth to meet design load for each size of anchor, drive p the expansion plug deeper in 1/8" increments and per-
- d. fom a pull test at each deeper increcent until 300% design load is reached. Record information on Data Sheet No. 3.
- h. 'For each ancho= nize, drive the expansion plug fully one time and test per above. Record findings on Data Sheet No. 3.
2.0 Unmodified Phillips Anchors 2.1 Plug Depth Before Driving NOTE: Use Phillips test gauge as shown in Figure 3 for each size of Phillips anchors for measurements.
- a. Select ten Phillips anchors. Insert the expansion plugs (by hand) as far as possible. Tap the plug lightly to assure that it is seated on it's taper.
- b. Insert test gauge in each selected anchor and .neasure from the top of the expansion plug to the shoulder of the test gauge. Record the information on Data Sheet No. 2.
NOTE: I': is extremely important that the test gauge be inu.rted as far as possible when ob-taining measurements to assure that the test gauge lg 1 -
is at the end of the threaded section.
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of Phillips anchops and record on Data Sheet No. 2.
2.2 Min h a Depth of Expa'ision .
Plug to Meet Design load . .
- a. Test Phiu ips.' anchors as outlined in Section 2.1 D except for the following.
(1) The depth of the expansion plug is the difference
.A from the top of the' plug to the. shoulder of the test gauge (after driving plug) and the distance determined in 2.1.
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. (2) Record pullaout data on Data Sheet No. 4 and M. develop minimum field acceptance criteria for
-. . Phi.u.ips anchors. .
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.' -' (3) Terform Step .1.2.g for Phillips _ anchors and record M -
on Data Sheet 4. '
O (4) Perform Step 1.2.h for each size of Phillips o anchors and record on Data Sheet 4 h, 3.0 Modified Anchors ,
3.1 HILTI ANCHORS - Establishing a Reference Point for a Modified Anchor
- a. Select ten Hilti anchors at random for 1/2", S/8" and 3/4". l
- d. Record the distance from the face of the threaded I end to the end of the threaded section for each l anchor. , Record measurements on Data Sheet No. 5. )
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- c. Drill boles of required diameters to the depths l noted below. I l
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Anchor Size Hole Depth 1/2" 1 3/8" 5/8" 1 3/4" 3/4" 2 1/16"
- d. Install anchor in the holes and drive the plug until l the end of the threaded section is just visible, j
- e. Perform one pull test on each size anchor with' the plugs )
- driven to this depth and record the required information I g on Data Sheet No. 5.
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.- o. NOTE r ..If' .the anchor: fa3's. to meet..=M-= -acceptance -
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.n deep enougli to pass minimum acceptance criteria. ,
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3.2 PHILLIPS ANCHORS ' Establishing a Ref'erence Point for l l a Modified Anchor' l
. NOTE: The distance that the expansion plug is driven O can be detemined by measuring from the plug to the end
! of the threaded section. Since this measurement has I N p'reviously been obtained in Section 2.0, this test on g hillips anchors is not required.
3.3 YILTIANCHORS-ExpansionEndCutOff (Perform this test for each size of anchor) 7 ,
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._ .a. Fo.' each size of anchor, determine the minimum depth that the plug must.be driven to meet m M = = acceptable
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. design load. . Recor'd ori'-. Data Sheet No.'.15.:. (See Section 4 .' ' ^
T'1.7'and'Datfa Rh'eet 3cm 3 for QO piing deptli) ,, l~
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b.
Insert the expansion plug by hand, as far as possible.
O Tap the plug lightly .o assure that it' is seated on it's taper.
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- c. Measure overall length of unmodified ancher and record l v .on Data Sheet No. 15.
. d. Measure the distance from the shoulder of the expansion end to the plug. Record on Data Sheet 15.
- e. Subtract the minimum distance that the plug must be driven to meet design load (obtained from Data Sheet i No. 3) from the distance obtained in Step d. Cut I off this amount from the anchor expansion end. Record l information on Data Sheet No. 15. l
- f. Drill c. hole in concrete to the required depth so that the modified anchor will be flush or slightly above the surface of the concrete. Record hole depth on Data Sheet No. 15.
- g. Insert the anchor and drive the expansion plug fully.
Record the distance that the plug was driven. l l
- h. Perform a pull test on the modified anchor and record information,on Data Sheet No. 15. l
- 1. Repeat Steps e through h for the same size anchor, except decrease the amount cut off in 1/4" increments until 300% design 1,ad is reached. ,
. j. Perform this test for each size of Hilti anchor. l
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-(Perfom'1:his test -for, each anchor size) . . c..7., * ~.
, a. Iemove 3/4" from;this expansion and of the' anchor.
- b. Measure the overall length of the modified anchor i and record'on Data Sheet No. 16. ,
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- c. Drillholeckepthasrequiredtoallowtheanchor j N'
to be flush with the top surface after fully driving )
expansion plug. Record hole depth on Data Sheet No.16.
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- d. Insert anchor in hole and drive plug fully.
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"[~ e. Measure the distance that .the plug has been driven using the appropriate test gauge. Record on Data n Sheet No. 16. -
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Perfom a%un test on the azichor and record information' M on Data Sheet'No. 16. -
- 1 o g. Repeat this test, increasing the amount removed from I the expansion end in 1/4" increments, until the anchor o no longer meets minimum design load.
3.5 HILTI and PHILLIPS ANCHORS - Threaded End cut Off ,
- a. Obtain one anchor for each size and type.- l
- b. Cut off the threaded end until four full threads i
remain on each anchor. l
- c. Perform a pull test on each anchor. The hole depth should be deep enough so that the anchors are flush with the top surface of the concrete after driving their eKpansion plugs. The plugs should be driven fully for.each anchor. Record information on Data Sheet.No. 6.
NOTE: The pull test need not be perfomed to failure. Teminate the test at 300% of the design load. I I
4.0 Angular Hisalignment 1
4.1 15 Hisalignment - Plugs at Minimum Depth to Meet Design )
Load. .
- a. Perform one pul_1 test for each size and type of anchor.
The plugs are to be inserted to the minimum depths that have been determined to meet design load (Sections 1.0 and 2.0). The holes are to be drilled as close to 15 from vertical as possible. The hole depths are to be flush with the surface of the concrete after driving the expansion plugs. Record information on Data Sheet Nd. 8.
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_,,..u . ., .E:^.u..: .+*...t%v i:t
" - y :j." % :le '.h - X - ? ?-
.Txpansion- End. Cut :Off:-i+ - +.- "'L' o X A M O.- N
,_.. ~...._ . . . _ . .u ..c..L: ._ -
2
.-(Perform this test -f.o.r . .e. ach. anc. hor size)- . , ' ' ",- '.
.'a.
.. a. Romove 3/4".from ths expans. ion end of the anchor.
- b. Measure the overall length of the modified anchor and record'on Data Sheet No. 16. '
- c. Drill hole epth as required to allow the anchor g to bei flush with the top surface after fully driving expansion plug. Record hele depth on Data Sheet No.16. '
- d. Insert anchor in hole and drive plug fully.
[~ e. Measure the distance that .the plug has been driven using the appropriate test gauge. Record on Data to Sheet No. 16.
ME ~
' -~ -"
f. Perfo:-m a buli test on the anchor and recordJinformation to on Data Sheet'No. 16. -
O g. Repeat this test, increasing the amount removed from the expansion end in 1/4" increments, until the anchor o no longer meets minimum design losd.
3.5 HILTI and PHILLIPS ANCHORS - Threaded Enc' Cut Off
- a. Obtain one anchor for each size and type.
b.. Cut off the threade. d end until four full threads remain on each anchor. '
- c. Perform a pull test on each anchor. The hole depth should be deep enough so that the anchors are flush with the top surface of the concrete after driving their eypansion plugs. The plugs should be driven '
3 fully for.each anchor. Record information on Data .
Sheet.No. 6. I NOTE: The pull test need not be performed to failure. Terminate the test at 300% of the design load. .
4.0 Angular Hisalignment i
4.1 15 Hisalignment - Plugs at Minimum Depth to Heet Design Load. l l
l
- a. Perform one pull test for each size and type of anchor. !
The plugs are to be inserted to the minimum depths that have been determined to meet design load (Sections
- 1. 0 and 2. 0). The holes are to be drilled as close to 15 from vertical as possible. The hole depths are to be flush with the surface of the concrete after driving the expansion plugs. Record information on Data Sheet l No. 8.
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.- .a . Perfonn one pull test-for each size ang type of anchor dith'.their. holes as close to 15 from vertical as possible. The expansion plugs are to be driven fully and the hole depths are to be deep enough for
. the tops of the anchors to be flush with the surface N of the concrete. Record on Data Sheet No. 7.
W 5.0 Shear Loading Over Dabedded Anchors t.n 5.1 HILTI ANCHORS - Perform Once for Tach Size of' Anchor.
~ ~ * '
- a. Drill holes of required size in a vertical concrete J- '
surface. Hole depths should be sufficiently deep to embed the anchors 1/2" below the surface of the con-
. crete.
g . . ..
NOTm Trill the holes at the required. height sI C
- S T F aboveMheWloor :so' that-the byaaulid cylinder loay be <=
P') I i placed on the floor and apply a -shear force to the.
!' anchor bolt.
~ '
O O b. Drive the expansion plugs fully on each anchor to be tested.
D)
( c. Insert a bolt of the proper size through the shear load test fixture shown in Figure 4 Tighten the bolt.
- d. Position the hydraulic cylinder under the test fixture.
- e. Increase the hydr'ulic a pressure until the anchor or the bolt fails, or 300% design load is reached. Record information on Data Sheet No. 9.
Discussion and Conclusions 6.0
, 6.1 Anchor Uniformity Data Sheets 2 and 5 indicate that. anchors are manufactured j with sufficient uniformity to use various reference points on the anchors to measure distances that expansion plugs' ,
are driven. Heasurements were repeatable within l'/16" and in most cases, 1/32".
)
6.2 F.xpansion Plugs - Minimum cnd Fully Driven Distances l
The following table' summarizes test results for both (1) fbily driven expansion plugs and (2) expansion plugs driven to minimum depths and still meet acceptance l
, criteria. The results are from Data Sheets 3 and 4, i
including the remarks for each entry. An anchor was
. considered to have failed when it's total displacement I exceeded 0.010". '
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Anchor Size 1/2" .5/8" 3/4" ,1/2" ,S/8" 3/4" 7/8" and Type HILTI~ HILTI HILTI- ~ PHILLIPS PHILLIPS PHILLI?! PHILLIPS Minimum Acceptabic 965 lbs, 1650 lbs 2585.lbs. 965 lbs, 1650 lbs. 2585 lb: 3685 lbs.
M .'
Force Required N
9"7'.n. Acceptabl 3/8" 3/8" 1/4" 3/16" 1/2" j 1/2)' '
1/2" Plug Driven '
/ '
JJ. stance % of Fully Driven Plug 63% 55% 29%
~
50% 76% 84% 73%
b Distance
.,/-
Ava. Porce Dev. 4010 lb 3039 lb, 3475- lb. 1606 lb. 3312 db. 6576 lb, 5692. -
'4t Hin. Plu % of Driven Di . Hin. Ac .
m ceptable Torce 416%. 184% 134% 166% 201% 254% 154%
t O
Fully Driven 19/32" 11/16" 7/8" 3/8" 21/32" 19/32" 11/16" h Plug Distance Force Developed / 4910 lb, 6140 lb. ll,000 1 Tor Fully 3740 lb. 2380 lb 6750 lb, 5890 lb Driven % of Hin. /,
Plug Acceptable Force 508% 372% 426% 388%
7 144% 261% 160%
Testing was' pern rmed in the northwest corner of the Diablo Canyon auxiliary building, elevation 64. Concrete in that are; is typical of 3000 psi concrete used through-out the plant.
Anchor slippage was the predominate mode of railure, even for fully driven expansion plugs. Hilti anchors generally hel.d until the applied force was sufficient to cause them to move. Once movement began, it continued quickly t.o failure. Generally, the force required to maintain a steady displacement was less than the force.that initially caused slippage.
Phillips anchors also failed by slipping, however, their h mode of slippage was different than Hilti anchors. Once slipping began, and if the applied force was then held c.ons tant , the anchors would eventually stop slipping. In-
, creasing the force would reinitiate anchor slipping. Holding
. _ _ - _ _ ~ _ - _ _ _ _ _ .
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. .to stab nize again. Turther force application would cause-the same effect until the point'at.which the anchor no ' '
longer stabilized; it would either slip to failure (es-peciany true for .sman expansion plug. driven distances) or the concrete failed because it's shear cone became'too
. small (especially true for anchors with their expansion N- plugs driven farther or funy driven).
N S'ome Phillips anchors were tested into the slip range and ultimately to failure. Several tests were performed in which the load was held constant after slipping had be-gun. After a short time, the anchor displacement stabilized.
.- - The load was released and then, slowly reapplied. The 27 anchor was able to withstand the load at which slipping had originany begun without further displacement. The force M . required to reinitiate slipping was approximately the same as that at which the . anchor had previously stabiLi=ed.
- Larger forcesavould then cause correspondingly largerranchor e n displacements until the ultimate force was reached causing ,
total failure. -
O Conclusion - Anchors with their expansion plugs driven at C least the distances shown in the above table will develop q sufficient strengths to meet minimua acceptable loads.
LJ 6.3 Modified Anchors - Threaded End Cut Off Results obtained from Data Sheet 5 indicate that if Hilti expansion plugs are driven to the point at which the end of the threaded section is just visible, only the 3/4" Hilti anchor win develop sufficient force to meet the acceptance criterion. The expansion plugs for 1/2" and 5/8" Hilti anchors must be driven 3/16" and 3/32" beyond the and of the threaded section, respectively, to meet acceptance criteria. These addition 21 plug depths'were required to meet the minimum plug driven distances previously
, established.
Data Sheet No. 6 contains results of anchors modified by cutting off the threaded end until four full threads remained. Generally, concrece failure, either cracking or shear cone pull-out, occurred during Hilti anchor testing.
This can be attributed to the anchors being closer to the surface. of the concrete. Phillips anchors exhibited their typical slipping phenomenon during this testing phase; their failure occured with no apparent concrete damage. The effective grip area.of Phillips anchors is farther below -
the concrete surfsce than that for Hilti anchors, hence the differences in failure modes. The following summarizes g results of Data Sheet No. 6:
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. Anchor Size Max. 4nount Force Dev. O of.. Min.
and Type Cut Off at. Failure Acceptable Torce 1/2" Hilti 1/2" 2860 lb. 296%
5/8" Hilti 25/32" 4710 lb. 285% -
g 3/4" H'.lti 1 1/8" 7350 lb. 284%
1/2" Phillips 5/8" 3340 lb. 346%
N 5/8" Phin ips 1/2" 5310 3. 322%
3/4" Phillips 1 1/8" 7770 lb. 301%
LII 7/8" Phin ips 15/16" n 200 lb. 304%
~
Conclusion - Anchors with their threaded end cut off to
,y _ the extent shown above, will meet minimum acceptable loads.
However, their expans, ion plugs must be funy driven and M"- hole depths must be sufficient to anow the anchors to be flush with the concrete surface.
w .
, . , ,. t 6.4 Modified Anchors - Expansion End' Cut Off -
c> Cutting off the expansion end reduced the anchor's ability to withstand loads. The' forces required to cause initial c> movements of Hilti anchors decreased as more of the expansion ends were removed. However, the reverse is true for Phillips B anchors. In all cases, the modified anchors were able to exceed the minimum acceptable test loads. The fonowing summarizes test results contained in Data Sheets 15 and 16:
Expansion End Cut Off Anchor Size Max. Amount Force Dev. % of Hin.
and Tvoe Cut off at railure Acceptable Force 1/2" Hilti 9/32'l 3210 lb. 333%
5/8" Hilti 3/3" 3175 lb. 192%
3/4" Hilti 11/16" 3500 lb. 135%
1/2" Phillips 7/8" 2080 lb. 216%
5/3" Phillips 1" 2980 lb. 181%
3/4" Phillips 1 1/16" 3730 lb. 144% ,
, 7/8" Phillips 1 1/2" 9570 lb. 260%
Conclusion - The expansion end of anchors can be cut off l to the extent shown above and still maintain sufficient I strengths te meet acceptance criteria. However, the expansion plugs must be driven fully and hole depth mus ,
be sufficient to allow the anchor to be flush with the l Concrete surfaC2. I
9
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'- ' ' ' ' ' - ' ~ ' -
Anchors installed approximately 15 from vertical were '
stin ab.Le to meet minimum acceptance criteria. The
. fonowing summarizes test results contained in Data Sheet 7 and 8:
Plugs Fully Driven Plugs Driven Hin. Distance 3 Anchor Size Applied % of Min. Applied % of Hin. .
and Type Force Acceptable Load Force Acceotable Load t.fi 1/2" Hilti 3130 lb. 324% 3100 lb. 322%
5/8" Hilti 5725 lb. 347% 1*40 lb. 105%
~
- ..- 3/4" Hilti 8820 lb. 341% 2670 lb. 103%
1/2" Phinip 2900 1c. 300% 2170 lb. 225%
3 5/8" Phillip 5725 lb. 347% 2940 lb. 178%
3/4" Phinip 7770 lb. 300% 4120 lb. 135%
h 7/8" Phf114p 11,420 lb. 310% 10.,00 0.,1.b . .271 %
M. Phillips anchors did mot c.xhibit -the previously ex-O perienced slip phenomenon' when -angularily misinstaned.
They generany were able to sustain larger loads than 6 equivalent properly insta ued anchors.
Conclusion - Anchors with expansien plugs driven at least the minimum distances previously established can be misinstau ed up to 15 from vertical and still meet minimum acceptance criteria.
6'. 6 Over Embedment Effects on Shear Strengths _
All Hilti anchors easily exceeded 300% minimum acceptable.
shear strength values. There was no evidence of concrete failure after testing, however, threads on the bolts were slightly flattened. Several bolts were bent approximately two to five degrees.
Minimum acceptacle shear strength values are 10% greater than Table A she'ar values for 3000 psi concrete in PG&E Engineering Standard 054162, Revision 2. .
Phinips anchors were not tested because their self drining feature prevents overembedmant. However, the same test results would have been obtained had Phillips anchors been tested.
Conclusion - Over embedding anchors up to 1/2" be ow the surface of the concrete win not affect the shear strength of the bolted connection.
D .
(/ ,
6.7 Testing in 5000 psi concrete -
Testing was not performed in 5000 psi concrete because design did not take credit for the extra strength developed by
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encountered was anchor slippage,'notl concrete failure.
In the few cases where concrete failed, stronger concrete '
should produce more. favorable results.
Since testing in 5000 psi concrete wa's not performed, I Data' Sheets 10 through 14 have been deletec from the )
procedure, l
l N '
APPENDIX .
!.f?
j CONTENTS: '
.- i 7- 1. ' Figure 1 - Pull Test Fixture ,
. . 2. Figure 2 - Cylinder Force vs. Hydraulic Pressure ,
- 3. Figure 3 ,Phillips Anchor Test Gauge '
l*3 '
- 4. Figure 4 - Shear Test Fixture
- i l
O .
- 5. Data Sheet 1 - Hydraulle cylinder Force g 6. Data Sheet 2 - Initial Plug Depth ,
- 7. Data Sheet 3 - Minimum Expansion Flug Depth to Meet Design Load'
- 8. Data Sheet 4 - Min'imum Expansion Plug Depth to Meet Design Load
- 9. Data She'et 5 - Hilti Anchor-Threaded.End cut Off
- 10. Data Sheet.6 - Load Limits for Tour Full Threads
- 11. Data Sheet 7 - 15 Misalignment-Plugs Fully Driven
- 12. Data Sheet 8 - 15 Misalignment-Plugs at Minimum Depth to Meet Design Load
- 13. Dr.ta Sheet 9 - Shear Strength-Anchor 1/2" Below Surface of Concrete
- 14. Data Sheet 10 - Pull Out Force at Hin. Plug Depth-5,000 psi concrete
- 15. Data Sheet 11 - Hilti Anchor-Thread End Cut.0ff, 5,000 psi Concrete
- 16. Data Sheet 12 - 15 Misalignment-Plug Fully Driven, 5,000 psi concrete
- 17. Data Sheet 13 - 15 Misalignment-Plugs at Minimum Depth to Meet Design Load,.
5,000 ps'i Concrete
- 18. Data Sheet 14 - Anchors 1/2" Below Surface of Concrete, 5,000 psi Conerste S
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- 20. DataSheet16-PhillipsAnchor-ExpansionEndCutOff '
- 21. Data Sheet 17.- Instruments Used During Testing ,
- 22. Ref erences:
- a. "Concrete Expansion Anchors for Static and Seismic Loading",
Engineering Design Standard 054162, Change 2, 4/17/73.
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