Quote:
Originally Posted by rlw777
The concrete shear walls on the north and south end of the highest portion of the tower end at the same point as the middle portion of the tower. It's then just columns and the core the rest of the way to the top to open up views. This suggests that the portion with shear walls are going to be significantly more rigid and I would guess those shear walls are the reason they don't need any blow-thru floors below that point. One can assume that of those top floors the ones closest to the sheer walls are the most stable. Floors closer to the base have less leverage on the structure than those at the top and since they have the smallest floor plates of the frustrum making them blow-thru does even less to negate the effects of the wind because there's less surface area for the wind to push against.
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this was a great explanation. thank you.