I can't believe I am diving into this again....
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Originally Posted by willravel
I'm looking for more footage of the WTC 7 collapse, but it is scarce. As I have stated before, no steel reinforced buildings besides the WTC have ever collapsed because of fire. WTC 7 was not hit by a plane. Why did it fall at all, let alone all columns giving way at once?
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WTC was hit by one of the WTC towers as they collapsed, so it was not just fire. Most of the pics you see are from the north, which faced away from the towers, so you do not see the damage on the south side.
Plus, the fires continued for hours with little or no effort to put them out.
Your stat that no steel-reinforced buildings have collapsed from fire isn't a fair comparison, as those other buildings likely (a) had not suffered extensive structural damage at the same time, and (b) had someone trying to put the fire out.
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Originally Posted by willravel
The blueprints weere classified after 9/11. Even with the unorthodox design structure, making it seemingly more likely to collapse, why did it fall from a few small fires?
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See above. (And I recall seeing detailed schematics of WTC 7 floor plans in at least one report from the feds, so I'm not sure what your point is on floorplans being classified....other than adding a layer of spookiness)
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Originally Posted by willravel
Well the WTC towers were each hit from one side, ripping through the outer supports. Why didn't they fall into the side that they were struck? Why did the top floor collapse first? I know heat rises, but it can't be hotter above than it is in the middle (the source of the heat), and the middle had much more stress (namely the top 1/3 of the building) to deal with.
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we've been through this before. A rigid structure would tip over if the support were taken out from one side. Like a tree being chopped down.
A building is not a tree. It collapses upon itself if it fails.
I'm not an engineer, but I suspect Martian is right when he says they are designed to do this.
I don't believe the top did collapse first. I assume you are referring to the slight drop in the antenna before the building collapsed to suggest that the top fell first. But wouldn't that also be consistent with the central core beginning to collapse somewhere near the impact, thus lowering all of the structure resting upon it?
The actual collapse started around the middle (with the little puffs of debris all around the exterior that you equate with demo charges).