Icon Re: Seismic Data Refutes Official WTC Explanation
B
Brian (view)

I am compelled to respond to these statements.  You wrote:

>> Also, Building 7, which was NOT hit by any plane at all, fell in precisely the same symmetrical fashion, many hours later, after 4:00pm that afternoon.
>> What is your answer to that one?!?!?

Here is a quote from the World Trade Center Building Performance Study published by the Federal Emergency Management Agency (available at http://www.fema.gov/pdf/library/fema403_execsum.pdf):

"The debris from the collapses of the WTC towers also initiated fires in surrounding buildings, including WTC 7.  WTC 7 collapsed completely after burning unchecked for approximately 7 hours.  Studies of WTC 7 indicate that the collapse began in the lower stories, either through failure of major load transfer members located above an electrical substation structure or in columns in the stories above the transfer structure."

You also wrote:

>> Furthermore, as each of the two towers were impacted on one side only by one airplane each, there has been DEAD SILENCE on the fact that both buildings fell in identical PRECISE SYMMETRICAL MANNER...

This fact was discussed nine months ago by Dr. Thomas Eagar in the December 2001 issue of Journal of the Minerals, Metals, and Materials Society.  His article Why Did the World Trade Center Collapse? Science, Engineering, and Speculation (available at http://www.tms.org/pubs/journals/JOM/0112/Eagar/Eagar-0112.html) explains exactly why the main two towers fell.  To summarize, the steel joists supporting the heavily burned floors failed due to the heat and the floors below could not support the weight of the upper floors collapsing downward.  As for the symmetrical manner in which the buildings collapsed, Dr. Eagar states that a 500,000 ton structure has too much inertia to fall in any direction other than nearly straight down.  And by the way Dr. Eagar does not work for the government.  He is an engineering professor at the Massachusetts Institute of Technology.

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