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Depends on mass. As Bazant & Le calculate, some initial crush-up indeed occurs. The amount obviously depends upon momentum.Major_Tom wrote: 1) Does the upper block retain it's form?
I can only imagine, since I don't/can't watch videos. Not relevant to the developments in BLGB, since there is no three story free fall in the collapse of WTC 1.2) Don't both upper and lower block seem to destroy one another?
Provide me with well done measurements and I'll be happy to calculate the degree of conformity. I anticipate little until after the two blocks collide and thereafter fair agreement to a crush-down equation.3) Does the movement of the upper and lower block conform to the equations of motion in BGLB or it's offshoots?
Make some measurements from the video. My initial conjecture is that the demo starts near free fall acceleration, much greater than the (nominal) 0.7g for WTC 1.Does the initial speed of decent of the upper block of this demo where we know all supports were intentionally removed at the same time, compare to the initial WTC 1 movement?
Engineering conservatism.To crush this building, the technicians who planned this demo felt that 3 floors of initial fall would be sufficient.
So we have a drop of 7 meters in 1.2 seconds in which case the acceleration was (2x7)/(1.2)^2 = 9.7 m/s^2, or pretty close to g!
I would like to view the claimed "total distruction" of the upper portion for myself.
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