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Originally Posted by Domamania
I am sorry, Pardon my ignorance. What is a hat truss?
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Best to use this video to explain it to you. Seems like the new World Trade Center would have the same design. The explanation of the hat truss begins at 3:50, but I suggest you watch the whole video. Most skyscrapers are built like this nowadays, and it would teach you a lot about engineering and architecture, but ignore conspiracies.
• Video Link