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=I Beam Sizes and Spans= | =I Beam Sizes and Spans= | ||
*12x5" beams allow 24' spans holding about 10 tons of weight. These beams are about 35 lb per foot. | *12x5" beams allow 24' spans holding about 10 tons of weight. These beams are about 35 lb per foot. | ||
*Compare [[Rebar Truss]]-based | *Compare [[Rebar Truss]]-based [[Rebar Tubular Space Frame]] at 15 lb per foot. | ||
[[File:ikips.jpg|500px]] | [[File:ikips.jpg|500px]] | ||
Revision as of 20:23, 31 October 2021
I Beam Sizes and Spans
- 12x5" beams allow 24' spans holding about 10 tons of weight. These beams are about 35 lb per foot.
- Compare Rebar Truss-based Rebar Tubular Space Frame at 15 lb per foot.
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].