PROBLEM $4\mathrm{.}3$:

A square footing $2\mathrm{.}0m2\mathrm{.}0m0\mathrm{.}45m$ thick supports a rectangular column $0\mathrm{.}35m0\mathrm{.}40m$ at its

center carries a service dead load of $500$ kN and a service live load of $400kN.f_c^{\text{'}}=21$MPa,$f_y=$

$414$ MPa $.$ Concrete cover to the centroid of steel reinforcement $=100mm.$

a$.$ Calculate the maximum wide$-$beam shear stress.

b$.$ Calculate the maximum punching shear stress.

c$.$ Determine the design moment at ultimate loads.