For Problems $5\mathrm{.}53$ and $5\mathrm{.}54,$ determine the theoretical steel areas required for the sections shown. In each case, the dimensions are limited to the values shown. If compression steel is required, assume it will be placed $70mm$ from the compression face. $f_c^{\text{'}}=28$MPa,$f_y=420$MPa, and $E_s=200000$MPa.

Problem $5\mathrm{.}53($Ans$.A_s=6592m{m}^2,A_s^{\text{'}}=2158m{m}^2)$

$M_u=1500kN*m$