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Politics : Foreign Affairs Discussion Group

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To: neolib who wrote (175266)	11/18/2005 11:50:53 AM
From: Orcastraiter	Read Replies (1) of 281500

Structural steel has half its yield strength at 500-550 C IIRC. That's basically the same thing that I posted, except that I used degrees F and not C. I'm not disputing that fire insulating coatings are required on many steel buildings. Tall skyscrapers all have fire insulation. I am not aware of anyone specifying wood as the insulation for steel on any high rise buildings. It may be allowed in smaller buildings. The WTC 1,2 and 7 columns all had insulation. The fires in WTC 1 and 2 were not very hot. There is a photo of a woman standing in the hole where the plane crashed in the first tower hit. Firemen were in the building and were reporting back that the fires were small and could be knocked down with a couple hoses. The fires in 7 were small and localized. The problem lies in being able to answer why the buildings collapsed in near free fall time. Progressive collapses, as put forth by NIST and FEMA for all three buildings, do not address the conservation of momentum issues and the symmetry of collapse. Orca

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