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http://www.civil.usyd.edu.au/wtc.htm

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National Council of Structural Engineering Associations http://dwp.bigplanet.com/engineers/ 

According to one of the designers of the World Trade Center (WTC), the towers were originally designed to take the impact of a Boeing
707; and the impact of the aircraft this morning did not take the buildings down. In fact, WTC One stood for 1 hour and WTC Two stood
for 1 3/4 hours after impact. Engineers familiar with the chain of events suspect that heat from the massive and extraordinary fires
weakened the structures and initiated the progressive collapses.

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British Engineers Give Their Theory Taken from BBC
http://news.bbc.co.uk/hi/english/world/americas/newsid_1540000/1540044.stm

The design of the World Trade Center saved thousands of lives by standing for well over an hour after the planes crashed into its twin
towers, say structural engineers. 

"It was the fire that killed the buildings - nothing on Earth could survive those temperatures with that amount of fuel burning"
Structural engineer Chris Wise 

But the towers' ultimate collapse was inevitable, as the steel cores inside them reached temperatures of 800C - raising questions why
hundreds of rescue workers were sent into the doomed buildings to their deaths. 
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AISC Task Force to Investigate World Trade Center Collapse 

structure. It is believed that the collapse of the 47-story building adjacent to the twin towers was caused by a combination of its
foundations and structure being weakened by the collapsing twin towers and fire. 

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-- 
===============================================
Kiyohide NOMURA
Department of Physics,
Kyushu University,
812-8581 Fukuoka
JAPAN

e-mail:knomura@stat.phys.kyushu-u.ac.jp
http://maya.phys.kyushu-u.ac.jp/
TEL,FAX:+81-92-642-2566
================================================