Skyscrapers: Difference between revisions
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=Failure Modes= | =Failure Modes= | ||
*Fire protective coating on floor beams, and flexible vertical columns were found in the WTC collapse, according to the official reports. [https://youtu.be/SnwYYF_gK1s?t=61]. 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 [https://www.sciencedaily.com/releases/2011/09/110921074747.htm]. | *Fire protective coating on floor beams, and flexible vertical columns were found in the WTC collapse, according to the official reports. [https://youtu.be/SnwYYF_gK1s?t=61]. 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 [https://www.sciencedaily.com/releases/2011/09/110921074747.htm]. | ||
=Steel I-Beams= | |||
Table at https://amesweb.info/Profiles/Standard-Steel-I-Beam-Sizes-Chart.aspx | |||
Latest revision as of 20:31, 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 9.5 lb per foot. Reinforced 4x gets us 10 ton loads with 24 foot spans. At what deflection? Probably L/250 or 0.4%.
- We had 1/4" deflection at Universal Prototyping Structure
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].
Steel I-Beams
Table at https://amesweb.info/Profiles/Standard-Steel-I-Beam-Sizes-Chart.aspx