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The Pile Driver Theory

"Think of the impact of dropping a 25-story building straight down," Hamburger told the audience. "It was like a pile driver, which is why it collapsed as it did."
-- news-service.stanford.edu

Further down the building, even steel at normal temperatures gave way under the enormous weight - an estimated 100,000 tonnes from the upper floors alone.

"It was as if the top of the building was acting like a huge pile driver, crashing down on to the floors underneath," said Chris Wise.
-- news.bbc.co.uk

When those upper floors began to fall, they forced everything below them to collapse in a "piledriver" effect.
-- Dr. David Whitehouse; news.bbc.co.uk
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