Problem

Select the lightest available W$24-$section for the mid$-$apan concentrated service live load of $9$ kijm $,$ and unifors lood of $0\mathrm{.}9$kip$\frac{s}{f}t$ dead load $($ischaling own weight of the beun$)$ and $2\mathrm{.}1$ kiparf live load as shown in the figure belonw. Lateral bracing is previded at the ends and mid$-$span. The masinum deflection mus not exoeod $\frac{1}{240}.$ Cheek its alequacy in shear and drflection't Steet used is