Problem $1(20\%)$

For the braced beam$-$column shown, the loads and moments were obtained

using the requirements of the Direct Analysis Method. If the first$-$order

moments shown are about the $x-$axis, select the lightest W$8(50$ ksi steel$).$

Assume $C_b=1\mathrm{.}0.$ Use the equivalent axial load method to estimate the

lightest section then, use the LRFD approximate second order analysis

method to check if the section is satisfactory or not.

Problem $2(30\%)$