09-08-2013, 07:35 PM
Moving over to your collapse cartoon: I have studied it and do not understand it.
First, what is axial strength?
Second, I see that after the airplane impact, their are two load arrows, one pointing down and one pointing up. Obviously you don't mean that when the up arrow is bigger than the down arrow, the core starts to push out the top of the building. Or do you? And then the load appears to transfer out the hat truss and down the perimeter columns until collapse. It appears that as the load transferred symmetrically by the perimeter columns becomes so great it causes the weakened core columns to compress like a piston pulling down the entire building from floors 94 and up uniformly down onto the building below. That's the way I read your cartoon.
First, what is axial strength?
Second, I see that after the airplane impact, their are two load arrows, one pointing down and one pointing up. Obviously you don't mean that when the up arrow is bigger than the down arrow, the core starts to push out the top of the building. Or do you? And then the load appears to transfer out the hat truss and down the perimeter columns until collapse. It appears that as the load transferred symmetrically by the perimeter columns becomes so great it causes the weakened core columns to compress like a piston pulling down the entire building from floors 94 and up uniformly down onto the building below. That's the way I read your cartoon.
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