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To: Jeff Head
When I saw the towers go down, I started wondering how that could happen if they were struck midway up the side. (and just who was flying those planes? I can't believe a commercial airline pilot would do that, even at gunpoint.)

We'll no doubt hear all kinds of conspiracy theories about bombs in the basement, but my thinking is much simpler than that: Burning jet fuel and other combustibles inside the towers fell down the elevator shafts and continued burning at the base of the buildings, grossly weakening the structural steel and concrete.

Now my question is this: do structural engineers take into account burning material falling through these shafts during a fire of any kind, and is there any way to prevent the consequences?

15 posted on 09/11/2001 9:43:21 AM PDT by Hank Rearden
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To: Hank Rearden
Either the pilots were in on it, or the terrorists quickly secured the cockpit and flew it themselves.
17 posted on 09/11/2001 9:47:18 AM PDT by gjenkins
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To: Hank Rearden
Now my question is this: do structural engineers take into account burning material falling through these shafts during a fire of any kind, and is there any way to prevent the consequences?

Yes, they do. However, with buildings of that height and mass, such damage causes immense structural harmonic distortion, and you may have noticed that when the 2nd one collapsed, it imploded from the inside.

There is simply no way to account for it architecturally or on a systems basis other than not to build them nearly so high.

18 posted on 09/11/2001 9:50:13 AM PDT by Cernunnos
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To: Hank Rearden
The Trade Towers were built by a new modern lattice construction method. You severely impact one part of the lattice and the whole shebang can collapse. On one tower the crashed plane drilled in one side and partly out the other.

Kind of hard to believe, huh

26 posted on 09/11/2001 10:33:33 AM PDT by dennisw
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