Select the lightest S section that will safely support the service tensile loads PD = 75 k and PL = 40 k. The member is to be 20 ft long and is assumed to have one line of holes for -in Ø bolts in each flange. Assume that there are at least three holes in each line 4 in on center. Use A36 steel.
Select sections for the conditions described, using unless otherwise noted, and neglecting block shear.
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