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Reply #39: the construction method was different. [View All]

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petgoat Donating Member (1000+ posts) Send PM | Profile | Ignore Fri Oct-07-05 01:37 PM
Response to Reply #33
39. the construction method was different.
Edited on Fri Oct-07-05 01:53 PM by petgoat
Your examples involve unfireproofed trussed-roof spans that failed from
big fires. The columns didn't fail.

NIST says that because the fireproofing was removed from the core
columns, therefore the columns failed. They do not put forth the
pancake theory that collapsing floors brought the towers down. They do
say that weakened and sagging floors pulled on the perimeter columns and
buckled them, but their evidence for this is photographs that can
easily be explained alternatively by optical distortions produced by
heat waves.

Spooked's experiment tested the strength of vertical columns in a fire.
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