
Originally Posted by
jamescollister
So why do all the other highrise buildings, with much bigger and longer fires still stand.
Firstly.
In the history of the world
there has never been a high rise fire with such unique circumstances as being hit by a massive plane resulting in such a high fire load.
Secondly the steel was compromised by having inadequate fire proofing on the steel girders.
Steel girders not adequately protected by fire proof coating do not take long to weaken when attacked by fire.
Even just with the weight of an average roof steel will fail let along the weight of multiple stories above.
Its not hard to understand when one has seen steel fail on the fire ground.
Basic stuff really.