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Sept. 11 Attacks: How Did the World Trade Center Towers Collapse?

Sept. 11 Attacks: How Did the World Trade Center Towers Collapse?

On September 11, 2001, two planes collided with the two towers of the World Trace Center in New York, United States. What was the structure of the twin towers that quickly collapsed?

The Twin Towers of the World Trade Center in New York were built in the early 1970s. They were the tallest towers in the world and were New Yorkers’ pride. Their Japanese architect designed a revolutionary structure: a kind of huge square tube supported by a central core. Thus, 40% of the weight of the towers was supported by its façade composed of 236 steel columns. The rest rests on a central core.

The 900 km/h impact devastates eight floors

The facades and the core were therefore welded across the 110-storey floors. On September 11, 2001, two planes hit both towers at full speed. In the south tower, the second to be hit, the 900 km/h impact devastated eight floors, 33 external columns, including 10 from the severed central core. The other load-bearing elements are overloaded, but the tower is holding up. It’s the fireworks that change everything, the fire spreads to the upper floors. The heat becomes so intense that it weakens and deforms the steel beams.

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