$1.$ A rectangular footing is subjected to factored axial load of $3000$ kN and factored moment of $600$ kN$-$m$.$ The factored moment is located along the long direction and the effective depth of the footing is $650$ mm$.$

Dimensions: Footing$=3$m x $5$m x $750$ mm

Column$=680$ mm $$

a$.$ Compute the critical nominal one$-$way shear stress.

b$.$ Compute the critical nominal punching shear stress.

c$.$ Compute the critical moment.

$2.$ check image

The rectangular footing shown is subjected to factored axial load of $P_u=3600kN,$ factored Moment $M_u=660kN-m.$ The effective depth is $d=650mm.$

a$.$ Calculate the critical nominal wide$-$beam shear stress due to axial load only.

b$.$ Calculate the critical nominal punching shear stress due to axial load only.

c$.$ Calculate the critical nominal wide$-$beam shear stress due to axial load and moment.