chipmunk stew
Philosopher
- Joined
- Jun 6, 2005
- Messages
- 7,448
And then... how does this translate into 80+ columns spontaneously and concomitantly losing 100% of their resistance? Oh yeah, it doesn't. Fire can't do that. It doesn't even make steel high rises collapse, let alone at the rate of gravity.
The NIST report describes the mechanism quite clearly, even for a layman. It was not spontaneous, but it was nearly concomitant because of the lateral propagation part of the chain of failures after the initiating event at column 79.
If you want to understand what happened, start here:
http://wtc.nist.gov/NCSTAR1/PDF/NCSTAR 1A.pdf
