Quote:
Originally Posted by Rochard
They didn't fall over, they fell down.
The concrete floor - which weighed tons - was supported by the core and the outer walls. When the support of the outer walls was gone, there was nothing holding these floors up. One floor fell, falling onto the floor below it, causing a pancake effect.
On top of this, while the the core and the outer walls held the concrete floors in place, the concrete floors helped to hold the other walls in place. When the floors collapsed, they took down the other walls with them.
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It is possible as there were a few floors of momentum. I just cant speak further as i dont know how they were built. I believe I heard some orig Eng say the towers were built to handle plane crashes and losing a certain amount of structural integrity.
But any frame should be able to support the upper floors and inner weight if say a middle floor is "pulled out" and it free falls 30 feet.
That is simple erector set 101 stuff. Now maybe that buliding couldnt handle it which would be hard to believe it would be built so (in essence) poorly and weakly.
Steel M Beam or whatever frames are strong shit my friends with huge vertical load capacities.