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
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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
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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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