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Reply #68: Collapse of the twin towers [View All]

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Time for change Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Mar-02-06 08:57 PM
Response to Reply #50
68. Collapse of the twin towers
I had a look at the site you linked me to, especially with regard to my noting of Griffin's discussion of the fact that the standard view of the WTC collapse (that the steel framework melted) could not be accurate because steel doesn't melt at the temperatures that could have been achieved in the WTC buildings on September 11th due to an airplane crash.

As far as I can tell, nobody would disagree with that statement.

But the site you referred me to notes some alternative theories:

1) Asif Usmani, a structural engineer from Edinburgh University proposed a theory, suggesting that collapse could be initiated through thermal expansion with temperatures of 600-800 degrees C.... when there is a fire underneath the trusses and the steel gets hot...it expands quite a lot...

Then the site author goes on to state: This proves nothing, of course -- even Usmani only says that his conclusions are provisional.

2) Department of Civil Engineering, Tsinghua University, Beijing.
Mechanical simulation: The results show that the direct reason for the collapse is the softening of steel under fire and the chain reaction damage of floors under the impact.

Then the site author goes on to state: This is short on detail, so evaluation is difficult. Its not clear who the study authors are, either.
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