You are viewing an obsolete version of the DU website which is no longer supported by the Administrators. Visit The New DU.
Democratic Underground Latest Greatest Lobby Journals Search Options Help Login

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

Printer-friendly format Printer-friendly format
Printer-friendly format Email this thread to a friend
Printer-friendly format Bookmark this thread
This topic is archived.
Home » Discuss » Topic Forums » September 11 Donate to DU
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 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.
Printer Friendly | Permalink |  | Top

Home » Discuss » Topic Forums » September 11 Donate to DU

Powered by DCForum+ Version 1.1 Copyright 1997-2002
Software has been extensively modified by the DU administrators

Important Notices: By participating on this discussion board, visitors agree to abide by the rules outlined on our Rules page. Messages posted on the Democratic Underground Discussion Forums are the opinions of the individuals who post them, and do not necessarily represent the opinions of Democratic Underground, LLC.

Home  |  Discussion Forums  |  Journals |  Store  |  Donate

About DU  |  Contact Us  |  Privacy Policy

Got a message for Democratic Underground? Click here to send us a message.

© 2001 - 2011 Democratic Underground, LLC