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Originally Posted by Geggy
I can see what you're saying, spectrex, but if that was the case, if the heat did cause the steel to melt, why didn't the steel bend or sag, which can cause the tower to tip and fall over, especially the south tower when the plane struck in a different angle rather than directly? How was it possible the bottom portion of steel supporting the tower to completely collapse? We should've seen at least 20 floors from ground up worth of steel bended and sagged after the collapsing. It takes an explosive device powerful enough to blast the steel into pieces. Most of the fuel were already up in flames and spewed out of the building as the planes struck the towers anyway. Judging from the size and color of the exploding fireballs, it didn't look like the plane was carrying kerosene fuel but some sort of other type of fuel or possibly the planes were carrying bombs.
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I dunno. I'm no scientist. I saw it on the Discovery Channel a couple of times. I should probably try to catch that special again sometime to explain better.
As far as I can remember it had to do with the way the floors were constructed. While the central column was very sturdy, the floors weren't. They were plates attached to the walls with trusses, covered in concrete. That's one of the reasons why the towers were built so quickly.
Anyway, the heat protection on these trusses, keeping the hundreds of tons of concrete and steel up, was weak, and if only one part of the truss were to fail, its integrity would be compromised immensely.
On the outside you wouldn't be able to see anything going on inside, which was filled with airplane fuel and other flammable materials. The trusses melt, fail and hundreds of tons of stuff comes crashing down. The walls fail because of the floor being gone and therefore not having anything to keep the outer walls from breaking. The weight is distributed unevenly and the central column fails because, even though it might have been able to support the weight of the top part normally, it can't survive the top part just kinda hitting it as most of it fails, and the towers fall.