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Softening of Steel

NIST theory relies on dramatic softening of steel to achieve "column instability".

Recall that:

NIST determined that there was no evidence that any of the samples had reached temperatures above 600 ÂșC.
(p 90/140)

FEMA Report:

In the mid-1990s British Steel and the Building Research Establishment performed a series of six experiments at Cardington to investigate the behavior of steel frame buildings. These experiments were conducted in a simulated, eight-story building. Secondary steel beams were not protected. Despite the temperature of the steel beams reaching 800-900 C (1,500-1,700 F) in three of the tests (well above the traditionally assumed critical temperature of 600 C (1,100 F), no collapse was observed in any of the six experiments).
page 69 Copyright 2006 911research.wtc7.net
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