why didn't the resistance of the twin towers and building #7 slow their collapse on 9/11?

Answer 1

put more foil in your hat,
you will worry less.
MIKE

Answer 2

these buildings were constructed with a new construction technique, few internal columns. The skeleton was all around the outside perimeter of the buildings. The emergency stairwells were protected by sheetrock walls alone. When the planes entered the buildings, the aviation fuel was ignited. The steel structure wasn't even insulated. When steel gets sufficiently hot it loses structural integrity. When the fire had burned enough, the steel floor joists at the point of impact buckled and pancaked or dropped down a floor. This was repeated all the way down. There was nothing in the center of the building to resist the collapse. There was a documentary about the collapses (possibly on PBS, not sure). The architect who dreamed up this construction method was interviewed; he was one traumatized man, the look on his face was priceless. I think it's safe to say this design was faulty and no more highrises will be built in this style. I suggest you read more, maybe you can find the documentary. It explained the 2 different ways the 2 buildings collapsed due to the differences in how the buildings were affected by the attacks.

Answer 3

Once the collapse started (which we'll simplify and accept the official report that it was fire weakening the structure, P>S> I believe this theory), the remaining columns were not strong enough to stop the rest of the building from collapsing.

Entertain the following alternative - if the buildings were strong enough to stop the collapse, the 30 - 40 stories of floor structure, elevators, walls, desks, etc, would have to have gone somewhere, i.e. they would have probably have been forced out into the surrounding streets, leading to fairly massive death in the surrounding area, where all the firefighting crews, equipment, media crews, fleeing occupants would have been. It might even have weakened the lower levels and collapsed them, killing all the people who were fleeing through the tunnels and into the mall and out on the far side of the WTC mall, (I believe this was Liberty street).

Building 7 collapsed differently, fire fighters had given up trying to fight that fire, and eventually, with the whole building in flames, it also collapsed.

Answer 4

Do you live in NYC? Were you here? let's stop talking about 9/11, okay?