The World Trade Center collapsed within two hours of impact, prompting several investigations and spawning a variety of conspiracy theories. 911Anniversary
FEMA’s report was published in 2002. This was followed by the National Institute of Standards and Technology’s three-year investigation, funded by the US Federal Government and published in 2005.
Aircraft are made from lightweight materials, such as aluminium. If you compare the mass of an aircraft with that of a skyscraper more than 400 metres tall and built from steel and concrete, it makes sense the building would not topple over.steady wind loads more than 30 times the aircrafts’ weight. It was fire that caused this. And this fire is believed to have come from the burning of remaining aircraft fuel.
The floors’ failure pulled the columns back inwards, eventually leading to them buckling, and the floors collapsing. The collapsing floors then fell on more floors below, leading to a progressive collapse.
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