ARC 418 Lecture Notes - Lecture 2: Galvanization, Weldability
5 Apr 2017
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These approximations are valid only for purposes of preliminary building layout. Standard depths are 1, 1. 5, 2, and 4 inches. Standard depth range from 2. 5 to 7 inches. 1/20 of their span for heavily loaded floors or widely spaced joists. At 1/24 of their span for roofs, lightly loaded floors, or closely spaced joists. Spacing of joists depends on the spanning capacities of the decking material. Typical joists spacing range from 2 to 10 feet. Depth of steel girders at 1/15 of their span. Width of beam or girder at 1/3 to of depth. Large beam that holds a lot of other beams. Depth at to 1/5 of span. For rectangular trusses: depth would be 1/8 to 1/12 of span. Add up total roof and floor area supported by column. Rather than mild steel is produced today. Preferred steel type for wide flange structural shapes. Where steel will remain exposed to exterior conditions.
