Diablerie said:
Hephaestos said:
take a hammer, put it on a spagetti... the spagetti doesn't break.
take the same hammer, but hit the top of the spagetti with it... the spagettin shatters.
that's what happened to the foundations and the whole structure when the top floors fell.... I have no idea of the weight of 20 floors of WTC .... but i'm pretty sure it was pretty damn heavy when used as a hammer on the rest of the building.
THe floors are indeed made to hold the weight of the top floors, and have a reasonable security margin... I just highly doubt that a mountain falling on top of the building was taken into account in these calculations.
if you look at a video, you'll see the top floors fall, and the rest follow, not a fall starting from the bottom.
http://www.youtube.com/watch?v=smreRx51cus&feature=related
and see how the smoke kind of preceeds the top block, that is consecutive floors shattering as they get hit.... though they start to shatter lower and lower, on 0:07 you can see a little puff of smoke comming out of a lower floor, that's the stress being repercuted downwards and shattering additional structure.
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Ok, your hammer hit the top of your noodles but the planes didn't hit the top of the buildings, they hit them on the side. And yes, it was close to the top. There was no mountain falling on the buildings as the planes had already hit. No building in history has every fallen from a plane hitting it.
When I look at the video I see a near freefall motion, as if a controlled demolition occured. Watch some of those and you will see.
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you didn't understand a thing to my hammer example....
1) the planes hit.... destroy 5-6 floors.
2) it burns for 45 mins
3) weight of top floors is too great for weakened material (both plane crash and burning weakened the 5-6 floors)
4) the 5-6 floors collaps
5) The 30 floors ABOVE the crash site are still intact, but they have nothing under them now, so they fall
6) the 30 floors abonve hit the rest of the tower, acting as a gazzilion ton hammer (the mountain).
7) everything shaters as the shockwave goes down the building
8) as it falls, the top of the tower encounters little resistance from the shockwaved shattered structure and seemingly freefalls, it falls just about as fast as the shockwave propagates.
Notice how the amount of smoke increases and comes always from under the falling part?
If that doesn't help you understand the processus... then just forget I said anything....
