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Select the lighest W section to carry a uniformly distributed load of 0.2 kip/ft superimposed (i.e....

Select the lighest W section to carry a uniformly distributed load of 0.2 kip/ft superimposed (i.e. in addition to the beam weight) and 0.8 kip/ft live load. The simly supported span is 20' and the compression flange is fully supported against lateral movement. Use LRFD and select for the following steels: A36, A992, and A572 Gr. 65

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