sethnintendo said:
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The steel weakens the most where the fire is strongest, these beams can no longer bear load. Extra load is therefore put on surrounding load bearing beams. This eventually causes mass collapse in the direction of the force acting upon it - gravity acts downwards not sideways.
The actual physics behind the collapse are well explained
http://www.civil.northwestern.edu/people/bazant/PDFs/Papers/466.pdf
You clearly have misunderstandings of 'the official explanation' and the physics involved if you think that for a building to collapse upon itself all sides must have been equally weakened.