D9.A.4.2 Design for Shear
The Design Shear value, Q_{D}, is evaluated for the beam. The update effective depth is used to then calculate the allowable shear stress. The allowable shear stress of concrete, f_{s}, is automatically calculated from design load type (permanent or temporary) and given density of concrete. The program then calculates the required bar size, a_{w}, and spacing of stirrups. The reinforcement ratio for the stirrup, p_{w}, is calculated for design Bar size and stirrup pitch and all the necessary checking is done.
For seismic loading it is needed to increase shear force ≥ 1.5 times the actual value and this can be done utilizing the Design Shear Modification factor, k (SMAG parameter) without changing the Design Moment.
Notes:

Stirrups are always assumed to be 2legged

Governing density to determine Light weight or Normal Weight Concrete is 2.3 kg/sq. cm