It was damaged severely
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this is one of those conspiracies that I was really big into believing and pushing myself until I understood how buildings work. previously I had heard about "safety factors", and the design loads, and figured that would have been enough to keep the buildings up even after some damage. I also didn't understand the "mechanics" behind how a building is built. I also bought into the bs about steel is stronger than aluminum.
Its not one single piece of steel that goes from the foundation to the roof. the columns may span multiple floors in one piece, but at some point there has to be a joint. same thing with the beams, there isn't one beam that goes from one side of the building to the other, with the columns supporting it at various points. while the columns may span multiple floors, probably 3/4 max, the beams are only going to go from one column to the next. so taking out even one column, is also going to take out 3 beams, then multiply that by however many floors that singular piece of column spans, and by however many columns were impacted. and that one plane is a real big deal.
along those lines no system is built to survive removing a column like that. even with the safety factor being 10/20/50% over the design load. that design load is spread out over the whole footprint of the building. the system is designed to be stronger than extra load, it is not designed to survive being made weaker. and it is also a lot easier when you can count on a whole building to distribute a load, that is why new construction there is so much shoring and extra support, because until you complete it, its not going to work like it should. you take out a couple columns and all those loads can't be distributed like they should. those loads need a structural path to be distributed to all the pieces, you take out one of those pieces and the load can't be shared to the next adjacent "good" column, because there is no path to get from one good column to the next, if a column in between had been compromised.
the aluminum vs steel thing is also dumb. lead bullets can penetrate steel plates. look at any hurricane or tornado damage and you will see crazy things, wood branches or 2x4 going thru concrete blocks. I have seen a #2 pencil embedded into the steel door of a fridge. speed kills. and you don't need the whole column to fail, just one part of it is compromised, and the whole thing is pretty useless.
I still get questioning the narrative surrounding the WTC, but the collapse makes sense.