$7-3.$ a$.$ Determine the available column strength for column $AB$ in the frame shown if

$F_y=50$ksi, and only in$-$plane behavior is considered. Furthermore, assume that the

column immediately below $AB$ is the same size as $AB,$ and also that all the other

assumptions on which the alignment charts were developed are met. $($Ans$.824$ k $,$

LRFD; $548k,$ASD

b$.$ Repeat part $($a$)$ if inelastic behavior is considered and $P_D=200k$ and $P_L=340k.$

$($Ans$.836$ k$,$ LRFD; $562$ k$,$ ASD$)$

Figure P$7-3$

LRDF only