I still don’t understand what part of this structure presents a mystery to you?
Or why catastrophic weakening of major support elements should be viewed as an illogical cause of the entire building collapsing.
There was severing of major structural elements, there was intense heat and stupendous weight and irresistible gravity and then momentum…
Why the mystery?
So you are impressed by the words “stupendous” and “irresistible”.
There was another famous collapse in this country. The Tacoma Narrows Bridge.
They built a physical model.
The model is shown at 2:45
Interestingly this model was built before the collapse. They knew there was a problem with the bridge caused by the wind but they did not know how bad it could get and that it could completely destroy the bridge. But the model is 54 feet long and built to 1:200th scale.
Now the north tower problem is different and the issue is not just collapse or not collapse. It is TIME TO COLLAPSE. The north tower came down in less than 30 seconds and some estimates say 10 or 11 seconds for the majority of the mass. But if you dropped a bowling ball from the top of the north tower it would take 9.22 seconds to reach the ground assuming NO AIR RESISTANCE. So how could 14 stories at the top destroy more than 90 stories below that were supposedly intact and do it in less than 26 seconds which is the maximum possible time shown in the videos.
Ever heard of the Conservation of Momentum?
But on the modelling business, they did not have electronic computers in 1940. So how is it that a collapse of a major engineering project could be resolved with a physical model decades ago but we can’t get a model of something that we apparently have sent Americans to go off and kill and die over?
Now we have 3-D printers to help make the model. The Tacoma model had to be built by hand, though it was not tested to destruction. If the printer can make parts 2 ft by 2 ft then each level would only be 1.5 inches tall. 110 of them stacked would be 13.7 feet, significantly smaller then the Tacoma Bridge model. 3-D printing would allow for lots of repeatable tests with parts made to computer precision. But we would still need accurate distribution of mass to test the collapse and determine how strong the levels had to be.
But then I haven’t seen that information much less heard serious discussion of modelling the collapse.
Of course after 12 years there would be a serious issue if a model will not completely collapse in a short enough time.