Page 177 - Forensic Structural Engineering Handbook

5.10 ENGINEERING RESPONSE TO FAILURES

xxx SEGMENT SERIAL NUMBER SITU REMAINED ATTACHED TO FOUNDATION
AT COLLAPSE SITE
xxx TENTATIVE SEGMENT LOCATION
NBS X SEGMENT REMOVED BY NBS
SEGMENT(S) NOT FOUND

6th Floor
EL.52'-4" 116 247
184 378 066
5th 098
EL.43'-8" 503

095
4th 380 222
EL.35'-0" 175
040
3rd
097
EL.26'-4" 384
174
2nd 058 291
EL.17'-8"
022
139 379
1st Floor
068 134 124
EL.9'-0"
128 065
Grd NBS
EL.0'-0"
061
158 377
126
177
C 060 466
EL.– –10'-0"

D 327
–
EL.–18'-8" 419
393
E SITU SITU
EL.– –27'-4"
BASE
COLUMN
DESIGNATION 1-E 2-E 3-E 3.8-E 4.8-E 6-E.5
FIGURE 5.7 For the investigation of the 1987 collapse of the L’Ambiance Plaza, a comprehensive serial
piece-mark system, in combination with identity marks and match marks, allowed almost complete recon-
struction of the columns, leading to a persuasive determination of the collapse cause, which differed from
the theory proposed by OSHA.