According to an interview on CNN today it was a combination of the impact of
the airplanes and the buckling of the support columns due to the heat of the
fire that caused the collapse.
Bill, KG4LOV
> Is there anyone among you more technically (construction) egineered that
to a layman can explain why the buildings actually collapsed. I mean
constructionwise.
> Is the sheer weight, the pressure from the collapsed top floors falling
down on the ones below, enough to cause the total collapse?
> Is there anything in the way they are constructed that would have
prevented the buildings from falling over (like falling on surrounding
areas)?
>
> (However, we can be grateful for the amount of time it actually did
withstand before collapsing, which probably gave some thousands (?) of
people the chance to get out alive from there alive.)
>
> Lasse
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