Eli5: Why did the World Trade Center towers collapse when they were hit so high up?

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Was there a design flaw or would any building of that height have failed?

In: Engineering

9 Answers

Anonymous 0 Comments

Check out some videos of explosive demolition for old buildings. A few tiny explosions crack some beams in a particular order and the whole building collapses into its footprint. Lifting those heavy beams way up in the air stores a lot of energy in them. If something were to weaken the support for that beam, all that energy accelerates the beam to the ground breaking stuff along the way. Once the building is moving down, hitting the Earth just crumples it up.

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