given problem, consider the length effeet anyway. For design problems, use whole inches for member si$\%$e$.$

$15\mathrm{.}1$ Determine the :aderpuacy of the section, including length effect, for a $16-$in$.$ square tied columin that has a clear height of is ft and serves as an interior member of a braced frame. The member is designed as axially loaded with the following service loats: live loarl, $1$:$30$ kips; dead load, $200$ kips. Use $f_t^{\text{'}}=4000$ psi and $f_{IJ}=60,000$ psi. Without actually selecting bars, assume about $2\frac{1}{2}\%$ total reinforcement equally divided in the opposite faces of the member. Use ACI moment magnifier method. $(400mm$ square section; $5\mathrm{.}5m$ clear height; $LL=580kN$;$DL=890kN$;$f_c^{\text{'}}=30$MPa;${\displaystyle \underset{11}{\overset{\phantom{}}{}}}=40(0$MPa$).$