ML20083D983

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Auxiliary Bldg Crack Mapping Evaluations for Grillage 8 Initial Jacking & Rejacking
ML20083D983
Person / Time
Site: Midland
Issue date: 12/09/1983
From:
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML20083D971 List:
References
AUX-001, AUX-1, NUDOCS 8312280385
Download: ML20083D983 (31)
v • d • e


Text

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) AUX-001 i

AUXILIARY BUILDING .

CRACK MAPPING EVALUATIONS FOR I

GRILLAGE 8 INITIAL JACKING & REJACKING s

8312280385 831209 PDR ADOCK 05000329 VDR A

DEC 19 1

)

AUXILIARY BUILDING CRACK MOVEMENT PURPOSE The purpose of this report is to evaluate the changes in cracks in critical Auxiliary Building walls and slabs between when the soil was removed beneath the East and West Electrical Penetration Areds (EPA), and when initial jacking load was transferred to both East and West 8 Grillage Beams. The crackmapping in these critical walls and slabs is required per the design specifications.

The changes in widths for selected cracks were also evaluated after rejacking.

The cracks considered for this evaluation were those which were reported to have changed in width after initial jacking of Grillage 8.

An overall plan and elevation of the Auxiliary Building are given in Attachment A. The location of Grillage 8 is also shown on these sketches.

Attachment B shows the dates of crackmapping, initial jacking of Grillage 8 and re-jacking of Grillage 8.

METHOD OF ANALYSIS

1. Each critical wall slab was divided into several areas with unique area numbers, (e.g. ).
2. All crae.ks which were reported to have increased or decreased in width and all reported ne.w cracks were reviewed after initial jacking. These crack changes are shown in Attachment C.
3. All the cracks which changed in width and all new cracks found after initial jacking, were again measured after re-jackings of Grillage 8.

Observed changes in the width of these cracks are given in Attachment D.

4. ~ rack width measurements at a given location have an estimated tolerance of .0025 inches. Therefore, readings taken at two different times for the same crack could easily differ by .005 inches.
5. The location, width and direction of cracks which changea were compared qualitatively with expected structural behavior during excavation, initial jacking and re-jackings.
6. The evaluation of cracks after the initial jacking event and the selected cracks after rejacking is tabulated in Attachment E.
7. Dr. Mete Sozen of the University of Illinois and Dr. A. E. Fiorato of
Construction Technology Laboratory inspected cracks which in their l

opinion warranted field inspection. They also reviewed this report and concurred with the conclusions which follow.

I 2

I CONCLUSION A. For Grillage 8 Jacking There are approximately 2,000 cracks which were monitored in the Auxiliary Building after initial Grillage 8 jacking. Evaluation of the crackmapping data has shown that only twenty-three (23) of these cracks changed in width (approximately 1%) while only twenty-one (21) new cracks were found (approximately 1% increase). The width changes which occurred were .005 inches or less except for two cases. In both of these cases the observed cracks were in the floor topping. After physical observation, it was judged that in these two cases, width changes were attributable to measurement dispersion. See Attachment E for summary of crack changes and evaluation of these changes. No alert or action level cracks were found during mapping.

It should be noted that crackmapping is intended to be used to identify a need for evaluation of the building. Alert and action levels for the crack widths are cet forth to trigger this evaluation. The primary monitoring device is the building movement instrumentation. The strain instrumentation, is the secondary monitoring device. ,

The observed changes in crack patterns and widths are in general consistent with previous patterns that indicate volume change movements.

The width changes are within the estimated tolerance limits of measurements. All of the crack widths are well below the alert limits, therefore need for special evaluation is not warranted.

B. For Grillage 8 Re-jacking Width of cracks which had been observed to have changed during initial jacking, were measured after re-jacking. Fvaluation of this data, indicates that all measured crack width changes are within the estimated tolerance of .005 inches. None of these cracks reached alert level.

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8 LEGEND:

g N e New crack I

O HL e Hair-line ,

i M . mil (.00 1 i n.)

1 CHANGE IN CRACK 4APPINC f MX11 f ANT BUILDING g FAST QECTRICAL PENETRAT?ON APEA I tr$T nrr OF W AI L AT COLL *N tine 7. 9 e' , DATES MAPPED:

EL.EB4*0~ 6 ---------------J 10/4/83 and -~

11/28/83FROM JACKING AT E/W 8 TO 11-28-83 26

t AREA CRACK CRACK MEASURMENTS (1 MIL =.001 in. ) EVALUATION . .

LOCATION I.D. NO WIDTH CHANGE WIDTH CHANGE AFTER I g JACKING AFTE{g g CKING FROM TO > 5 MILS FROM TO > 5 MILS West EPA 146 9N N HL No Within Tolerance.

Slab @ 628' 6" West EPA 238 *3 15 5 Yes Crack #3 in area 238 is in floor g slab @ 659' 0" 238 *13N N HL No topping with poorly defined worn m off edges which could have lead to "

239 *1 15 10 No 10 5 No 239 56 7.5 5 No measurement dispersion. All other fS 242 88 15 10 No cracks within tolerance. >

E Uest EPA Slab @ 674' 6' 282 1 7.5 5 No Within Tolerance.

{>

E West EPA 151 1 10 15 No Both cracks within tolerance. to North face 154 3 5 7.5 No 7.5 5 No $

of wall @ 20.3 "1N N HL No Cracks were reexamined and traces ofE Col. Line K 203 *2N N HL No paint within the crack indicated thtt$

614'-0" to 203 *3N N HL No it had formed before underpinning N 659'-0" 203 '4N N HL No operation. @

204 *1d N HL No $

204 *2N - N HL No S

South face or 339 6 7.5 5 No Within Tolerance. g wall, m j cn

?

East EPA 268 *1 HL 5 No Crack #2 in area 271 is in floor Slab e659'-0" '3 HL 5 No 5 10 No topping with poorly defined worn

  • 22N N HL No off edges which could have lead to 271 *2 7.5 15 Yes measurement dispersion. All other

' cracks witnin tolerance.

Cracks were noted as crazing when East EPA 312 10 Crazirg N/A 10 5 No 1

mapped afte: initial Jackir.g. Valves Slab #67 4'6" 11 10 Crazirg N/A 10 7.5 No from 7/28/83 tn 11/28/83 were withir

' tolerance. py East EPA 167 2N N HL No Both cracks within tolerance. gg North face of 139 1N N HL No g wall e Col. g Line K 614'-0" , ng l to 659'-0" w

g Control Tower 66 2N N HL No All cracks within tolerance.

Wect face 3N N HL No f wall e Col . 70 14 7.5 5 No Line 7.8

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SUMMARY

OF CRACK CHANGES FOR INITIAL JACKING AT E/W 8 GRILLACE DESCRIPTION NEW INCREASED DECREASED Total number of cracks. 21 10 13 Number of cracks greater than 0.005" change. 0 1 1 .

As shown above, relatively few cracks were observed to have changed in width during the introduction of the initial jacking loads for the Grillages. Of the reported twenty-one (21) new cracks after initial jacking, eight (8) were '

determined to have existed before start of underpinning based on subsequent inspection.

SUMMARY

OF SELECTED CR/.CK CHANGES FOR REJACKING AT E/W E GRILLAGE INCREASED DECRFASED Total number of crack changes. 6 7 Number of cracks greater than 0.005" change. 1 0 31

. _ _ . .-

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