Problem $5\mathrm{.}31($Ans$.500\mathrm{.}1ft-k)$

Analysis of Doubly Reinforced Beams

For Problems $5\mathrm{.}26$ to $5\mathrm{.}32,$ compute the design moment strengths $M_n$ of the beams shown if $f_y=60,000$ psi and $f_c^{\text{'}}=4000$ psi. Check the maximum permissible $A_s$ in each case to ensure ductile behavior.