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Politics : Foreign Affairs Discussion Group
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To: Doug R who wrote (202569)9/11/2006 2:08:40 PM
From: geode00  Read Replies (1) of 281500
 
"NIST’s findings do not support the “pancake theory” of collapse, which is premised on a progressive failure of the floor systems in the WTC towers (the composite floor system—that connected the core columns and the perimeter columns—consisted of a grid of steel “trusses” integrated with a concrete slab; see diagram below). Instead, the NIST investigation showed conclusively that the failure of the inwardly bowed perimeter columns initiated collapse and that the occurrence of this inward bowing required the sagging floors to remain connected to the columns and pull the columns inwards. Thus, the floors did not fail progressively to cause a pancaking phenomenon."

I guess I really don't understand the difference between the floor systems failing and the floors pulling in the columns inward.

I thought the point was that the collapse is a top down and not a bottom up situation. As the top floors gave way, they came down on the floors below them.

Isn't that pancaking?
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