Aren't we now approaching a tower that isn't "designed to fail" at all, then? The twins themselves can hardly be said to have been designed to fail, and yet both failed with spectacular speed and destructive power from two very different initiation points. ...
Ironically, or unfortunately,
WTC towers were designed to fail as seen, unintentionally, but as designed. Floors held up by by core and shell, the collapse seen was due to the design of the WTC. We can see the overwhelming mass destroying floor by floor, and that same mass rips apart the shell in large sections, and the core that remains can no longer stand because the shell which was the lateral support is gone. The towers design drove the failure as seen. A gravity collapse started by massive office fires, because the aircraft impacts 7 and 11 times the actual design point to stop a 187 pound of TNT KE impact destroyed fire systems and dislodged insulation accelerating the failure due to fire.
Not saying the WTC was designed to fail, I am saying the designed failed as it would due to the design. Evidence, collapse videos, full up models of the WTC. As for the spectacular speed, it is exactly the speed of a momentum model for the WTC floors failing, and the destructive power is spectacular, because the E=mgh is released and is equal in energy to more than 100 2,000 pounds bombs; thus the speed is physics, and the energy is physics, the speed is normal, the energy (destructive power) is spectacular, but explained by physics and expected.
Most, if not all, modeling of WTC towers fail to include floors held up by core and shell fail above a certain weight. WTC floors fail at connections to the core and shell at weights above 29,000,000 pounds. Has anyone seem models including this feature.