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Politics : Bush-The Mastermind behind 9/11?
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To: zonder who wrote (5692)3/19/2004 12:59:58 PM
From: Don Earl  Read Replies (3) of 20039
 
<<<That is unfortunately quite impossible in highrise buildings (like the twin towers in question) because the weight of the necessary cement becomes impossible to bear for the structure.>>>

Nonsense. The Empire State building is entirely reinforced concrete.

<<<Steel structures are designed with the amount and thickness of steel that will, in case of fire, permit the building to stand for an amount of time that will permit its occupants to escape. I don't recall the textbook requirement but it is something like a half hour. Then it will go down, because structural steel loses its strength after a certain temperature.>>>

You appear to be making this stuff up as you go along. There has never been a case of a steel building collapsing as a result of fire, and the WTC buildings were specifically engineered to withstand the impact of a 707. You're also confusing fire rated barriers with total destruction. Generally, residential buildings require 1 hour fire rated barriers between areas such as attached garages and ceilings. For commercial buildings, the requirement is generally 2 hour rated barriers.

Also, much of the WTC steel was encased in concrete. Not all of it, from what I understand, but you can go to the NIST site to view photos of some of the steel which still shows concrete residue stuck to it. The floors were 4 inches of concrete poured over steel plate, and were engineered to support over 300,000 pounds PER FLOOR.

For an exceptional collection of photographic and video evidence of controlled demolition of the towers, I highly recommend this site:

home.comcast.net
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