Verification of spread footing for punching shear

The program allows for the verification of spread footing for punching shear or for the design of shear reinforcement. The critical section loaded in shear U_cr is distant from the column edge by one half of the footing thickness. It is loaded by the prescribed moments M^*_x, M^*_y and by the shear force V^* provided by:

Dimensioning of shear reinforcement area At

The program computes the maximal shear force V^* developed in the critical section, the shear force transmitted by concrete with no shear reinforcement V_c, and the maximal allowable force V_max:

wher:

β_c c is the ratio of the long side to the short side of the critical section

For V^* < ϕV_c no shear reinforcement is needed.

For V^* > ϕV_c and V^* < ϕV_max the shear reinforcement must be introduced. The ultimate shear force is given by:

For V^* > ϕV_max the shear reinforcement cannot be designed. It is therefore necessary to increase the cross-section height.