Page 267 - Forensic Structural Engineering Handbook

DESIGN ERRORS, CONSTRUCTION DEFECTS, AND PROJECT MISCOMMUNICATION 8.7

Upper hunger
rod from ceiling

Concrete on
steel deck

Steel channels
welded to form
transverse box
beam

Nut and washer

Hanger rod to
Second floor walkway

FIGURE 8.4 (Continued)
load, (b) the as-built design could only support about 30 percent of that load, and (c) the
actual load just preceding the collapse was 53 percent of the design load required under the
Kansas City Building Code. Sadly, the last conclusion also suggests that under the original
design, although seriously deficient, the walkways would not have collapsed under the
actual loads on that day.

Upper hanger
rod pulled out

Lower hanger
rod
FIGURE 8.5 Pulled-out rod at fourth-floor box-beam.