ONLY DO $9-1$ and $9-5$ Show all steps Using both LRFD and ASD, select the most economical sections, with $F_y=50$ksi, unless otherwise specified, and assuming full lateral bracing for the compression flanges Working or service loads are given for each case, and beam weights are not included.

$9.$

$P\{\begin{array}{c}{P}_D=12k\end{array}$

$P_L=20k$

$w$ beam self$-$weight

FIGURE P$9-3($Ans W$1840$ LRFD and ASD$)$

$9-4.$ Repeat Prob. $9-3,$ using $P_L=20k.$

$9-1HW$

$0\mathrm{.}5.$

FGGURE P$9\mathrm{.}5($Ans$,$ W$2468$ LRFD$,$ W$2476$ ASD$)$