On the physics of high-rise building collapses
neither before nor since 9/11 have fires caused the total collapse of a steel-framed high-riseānor has any other natural event, with the exception of the 1985 Mexico City earthquake, which toppled a 21-story office building. Otherwise, the only phenomenon capable of collapsing such buildings completely has been by way of a procedure known as controlled demolition, whereby explosives or other devices are used to bring down a structure intentionally.
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