For all these problems, select sizes with LRFD expressions and check the selected

sections with both the LRFD and the ASD expressions.

$4-8.$ Select sections for the conditions described, using $F_y=50$ksi and $F_u=65$ksi, unless

othenwise noted, and neglecting block shear.

$4-1.$ Select the lightest W$12$ section available to support working tensile loads of $P_D=$

$120$ k and $P_W=288k.$ The member is to be $20$ ft long and is assumed to have two

lines of holes for $3/4-$in $\frac{O}{?}$ bolts in each flange. There will be at least three holes in

each line $3$ in on center. $($Ans$.$ W$1245$ LRFD and ASD$)$