Select the lightest S section that will safely support the service tensile loads PD = 75 k and PL… 1 answer below »

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.