A third building collapsed after a fire started. I think that is important,
the buildings in the USA are likely build with a steel frame. Steel loses
it's strength at 700-800 degrees centigrade. So the floors where the fire
was collapsed, and probably the forces during collapsing were to big for the
rest beneath. It took more then an hour before the collapse, so it wasn't
from the direct impact I would think. You could clearly see the collapsing
started at the floors where the fire was.
Frits W�thrich
>
> 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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