B$.$ Beams, laterally braced $($Ch$\mathrm{.}9,10)$:

Using LRFD$,$ select the most economical section 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. Check for

all $3$ limit states of flexure, shear, and deflections.

Hint: Use superposition, using Table $3-23$

Solution: W$24$x$76$