A $2\mathrm{.}5$ m x $2\mathrm{.}5$ m square footing supports a $250$ mm x $400$ mm column.

Footing thickness: $0\mathrm{.}7$ m

Bar diameter: $20$ mm both ways

Factored axial load: $1818$ kN

Clear cover: $75$ mm

Strength: f$\text{'}$c$=20\mathrm{.}7$ MPa, fy$=280$ MPa

Effective depth: $615$ mm

Reduction factors: shear$=0\mathrm{.}75,$ bending$=0\mathrm{.}9$

$1.)$ Calculate the actual nominal shear stress in the footing $($MPa$)$ at the critical section for beam shear action

A$.0\mathrm{.}322$

B$.0\mathrm{.}241$

C$.0\mathrm{.}697$

D$.0\mathrm{.}929$

$2.)$ Calculate the actual ultimate shear stress in the footing $($MPa$)$ at the critical section for beam shear action

A$.0\mathrm{.}322$

B$.0\mathrm{.}241$

C$.0\mathrm{.}697$

D$.0\mathrm{.}929$

$3.)$ Calculate the actual ultimate shear stress in the footing $($MPa$)$ at the critical section for punch shear action

A$.0\mathrm{.}322$

B$.0\mathrm{.}241$

C$.0\mathrm{.}697$

D$.0\mathrm{.}929$

$4.)$ Calculate the actual nominal shear stress in the footing $($MPa$)$ at the critical section for punch shear action

A$.0\mathrm{.}322$

B$.0\mathrm{.}241$

C$.0\mathrm{.}697$

D$.0\mathrm{.}929$