rwguinn
Penultimate Amazing
The huge welded plates that held the exterior columns together in threes are what resisted torsion and wind loading. Not the non existent concrete core. The core was all steel with two layers of 5/8 type X gypsum drywall on the core side of the fire walls with one layer of 5/8 type x on the exterior or office side of the fire walls. Also all concrete used in the towers was lightweight concrete with perlite, pumice, rotary fired shale and slag additives which weighs 90#-115# cu ft compared to 140#-150# cu ft. of conventional concrete.
there you go, ruining it for everyone!
Who are you to come in here, making sense, and sounding like you know what you're talking about?