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Also, if you cannot figure out how thermal expansion could do what it did, consider this:
"the phenomenon that we saw on 9/11 that brought this particular building down was really thermal expansion, which occurs at lower temperatures."
NCSTAR 1A 3.6] "This free fall drop continues for approximately 8 stories, the distance traveled between t=1.75s and t=4.0s...constant, downward acceleration during this time interval. This acceleration was *9.8m/s^2*, equivalent to the acceleration of gravity."
NICSTAR 1A 4.3.4] Global Collapse..."The entire building above the buckled column region moved downward in a single unit, as observed, completing the global collapse"
NCSTAR1A p.39/130
"the damage from the debris from WTC 1 had little effect on initiating the collapse of WTC 7."
What would happen if the long horizontal beams started to expand
Things start to come under extra stresses that were not meant to be experienced.
then what happens when those failures start to cause internal floors to buckle, then fall, all around the critical beam.
With nothing holding it up and helping it stay stable, once it goes,
"the phenomenon that we saw on 9/11 that brought this particular building down was really thermal expansion, which occurs at lower temperatures."