posted on Nov, 22 2015 @ 06:56 AM
a reply to: Urantia1111
Since the Twin towers were designed with a shorter lifespan they could sway about 3 feet either way.
With an effective inertial damper they could have lasted longer with fewer stress cycles.
The Chicago Tower has design elements with more purely compressive loads they sway less than 8 inches.
Assuming the rents get paid on the top floors, the thick Aluminum exoshell elements used for the Chicago tower should have longer life.