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Kasz216 on 02 September 2010
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Hephaestos said:
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.


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.

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....


Or to put it another way... say you work at a wharehouse.

 

You have a number of pallets stacked on top of each other, each with a layer of boxes.

The boxes will be fine regardless of the weight because of how they were put on each other.

You can remove pallets near the top few by simply pulling them out.  They can handle the weight.

If you need to remove one of the bottom pallets though... or even medium pallets... well... you gotta take apart the whole thing.

If you use your palet jack to pull out that palet... (And hold the rest in place by hand)  It's gonna crush all the boxes under it.  All of the layers of boxes.

 

It's basic physics.  It's why people who have actual arhitectural degrees don't question a plane felling a tower.

Let alone people who stack pallets in wharehouses.