Skyscrapers

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I Beam Sizes and Spans

12x5" beams allow 24' spans with

Failure Modes

Fire protective coating on floor beams, and flexible vertical columns were found in the WTC collapse, according to the official reports. [1]. Heat was from molten aluminum (20 tons of aluminum per plane) reacting with water. Molten aluminum in water are explosive. Lesson: do not build aluminum buildings [2].

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