Lasse Karlsson wrote:
> 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?
The towers are supposed to have been designed to withstand a pretty
sizable airplane running into them -- designers were aware of that
potential problem because a plane once did run into the Empire State
Building. (Back in the 1940s).
Either the designers miscalculated and did not allow for the impact of a
plane as large and heavy as the ones used, or the explosion and fire
from full fuel loads may have caused it. Indeed, I suppose some of the
structural steel could have partially melted from heat.
This is one of the questions that I suspect will be addressed by
investigators later, though.
Bob
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