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Replying to:

> Madrid Fire Re-opens 9/11 Questions: Why did the twin towers fall so fast?

10 March 2005 23:30
Fact: The Port Authority used lightweight open web trusses to span the distance between the 47 heavy steel columns in the center and the strong exterior columns. Read the Fema and NIST reports. They used these trusses and thin lightweight concrete to save weight so they could build higher. The buildings withstood the impact but were not able to withstand the fires which came afterwards. Unprotected lightweight steel trusses distort and fail to carry their loads after about ten minutes when exposed to fire.The fireproofing was shown to be deficient in the towers. Fact: The steel (...)


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