Skyscrapers: Difference between revisions
Jump to navigation
Jump to search
| Line 2: | Line 2: | ||
*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 [[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%. | *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 [[ | *We had 1/4" deflection at [[Universal Prototyping Structure]] | ||
[[File:ikips.jpg|500px]] | [[File:ikips.jpg|500px]] | ||
Revision as of 20:28, 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].