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“A mere glance of the relatively tiny truss seats is sufficient to state that they stood no chance of arresting the descent of ten or eleven floor assemblies, let alone their contents”
That sounds great until you take into account the fact that the floor system in the twin towers did not take any of gravity load of the building. It supported and it’s own weight. It’s job structurally was to transfer lateral loads redistributing overstress.
You said you’d studied this stuff. Trying to tell me about the structurak details for towers that you have NEVER seen the structural drawings for until tonight. And here you are getting the basics of a framed tube design wrong. Structural 101.
You should probably go get that SE now….. It would make for a more enlightening exchange.