$6-2$ Select the lightest available W$8$ section to support the axial loads $P_D=70$kips and

$P_L=95$kips if $L_C=15ft$ and $F_y=50$ksi$\mathrm{.}6-1$ to $6-3$ Use the trial$-$and$-$error procedure in which a $\frac{L_c}{r}$ value is estimated, the stresses ${}_c{F}_n$

and $\frac{F_n}{{}_c}$ determined from AISC Table $4-14,$ required areas calculated and trial sections selected

and checked and revised if necessary.

LRFD only