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Subject More WTC True Facts from Dave Farber's IP list

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Original Message More WTC True Facts from Dave Farber's IP list:

From: John Young <[email protected]>
Subject: New York Report
Date: Tue, 11 Sep 2001 11:14:39 -0700

[...]

A word on the structure of the WTC towers:

The WTC towers had a distinctive structural system which utilized
the exterior wall framing for lateral bracing -- a so-called lattice
framework. This allowed minimization of internal lateral bracing
and opened up the floor plans. You can see the effect of that when
the buildings collapsed, with the lattice framework crumbling and
the interior imploding. The lattice works so long as it remains
intact as a system: if a part of it goes, then the whole system
goes.

The planes punched holes in the lattice, one tower punched
on two sides, maybe the other too. Portions of the lattice of
the second tower briefly remained standing after the collapse,
then fell.

The system was considered daring at the time of construction, for
it distributed loads more efficiently than legacy column-and-beam-
supported systems. Probably the legacy systems would not have
totally collapsed due to damage at upper floors, although floors
above the damage would have come down if columns were
weakened.

Pictures (click to insert)





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