As for lack of collapse:
was structure reinforced concrete? Those buildings can take enormous heat for a long time and not fall down. Takes a while to heat up the concrete enough to melt the rebar in it, and with a redundant design (which it appears to have, at least externally) you'll have to maintain the heat long enough to melt the rebar AND to do it over a sufficiently large volume of the structure as to bring it down. Additionally, as you climb higher in the structure, that volume can increase too as there is less weight above the damaged portion to support.
Also, the building might have had a steel frame (I-beams) that was encased in concrete. Such encasement can improve the rigidity of the structure (27 story building subject to wind might need that), it can protect the frame from people in the building doing something stupid like drilling holes in it for TV coax, it can protect the steel from water leaks causing corrosion, and it certainly will protect the steel from fire.
was structure reinforced concrete? Those buildings can take enormous heat for a long time and not fall down. Takes a while to heat up the concrete enough to melt the rebar in it, and with a redundant design (which it appears to have, at least externally) you'll have to maintain the heat long enough to melt the rebar AND to do it over a sufficiently large volume of the structure as to bring it down. Additionally, as you climb higher in the structure, that volume can increase too as there is less weight above the damaged portion to support.
Also, the building might have had a steel frame (I-beams) that was encased in concrete. Such encasement can improve the rigidity of the structure (27 story building subject to wind might need that), it can protect the frame from people in the building doing something stupid like drilling holes in it for TV coax, it can protect the steel from water leaks causing corrosion, and it certainly will protect the steel from fire.
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