problem $3$

$($b$)$ The frame shown below is restrained against sidesway both in$-$plane and out$-$of$-$plane directions. In the out$-$of$-$plane direction, the beam$-$tocolumn connections and the supports are pinned only, whereas the connections in the plane of the frame are either pinned or rigid as shown. Assume ASTM A$992$ steel. Calculate the compressive resistance of FG column $(7$ maris$).$