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the idea that a fire could bring down a steel-beamed modern building is pretty funny when you look at the history of fires on them.
the idea that a fire could bring down a steel-beamed modern building is pretty funny when you look at the history of fires on them
The massive weight of the floors dropped, creating a dynamic load far in excess of what the columns were designed for. Debris was forced out of the windows as the floors above collapsed.
Controlled demolition is always carried out from the bottom floors up, yet this collapse started at the top.
The massive weight of the floors dropped, creating a dynamic load far in excess of what the columns were designed for. Debris was forced out of the windows as the floors above collapsed.
Originally posted by samkent
It's not funny since the WTC had NO horizontal steel beams (except core). Not on the exterior and not on the floors. All WTC had for horizontal strength was spandrels on the exterior and floor trusses on the interior.
Initially the focus was on the phrase "pull it" used by the owner, Larry Silverstein, in a TV interview. But in fact he was talking about pulling firefighters back. (Demolition experts do not use the term "pull it" as slang for setting off explosives.)