$9\mathrm{.}5.$ The columh shown in Fig. P$9\mathrm{.}5$ is subjected to axial load and bending moment, causing bending about an axis parallel to that of the rows of bars. What moment $M_n$ would cause the column to fail if the axial load $P_a$ applied simultaneously was $1250$ kips? Material strengths are $f_c^{\text{'}}=4000$ and $f_{,}=60$ksi

$f_e^{\text{'}}=4000*$

$f_y=60000*$

Given Properties

$P_n=1250$kip

$b=25in,h=25in$

$A_0=12A_{100}=15\mathrm{.}24i{n}^2$