For all problems, use $145l\frac{b}{f}{t}^3$ concrete and $50$ksi steel shapes.

$17-1$ to $17-3.$ Using the AISC equations, compute ${}_c{P}_n$ and $\frac{P_n}{{}_c}$ for each encased concrete

$(5$ksi$)$ section shown. $F_y=50$ksi,$F_{yr}=60$ksi,$w_c=145l\frac{b}{f}{t}^3.$

FIGURE P$17-1($Ans$.2458$ k$,1639$ k$)$