V_r is calculated using equation 11-4, where V_r = V_c + V_s, and V_c, V_s are shear resistance from concrete and transverse reinforcement, respectively.

The maximum shear resistance permitted by concrete is calculated using equation 11-5:

Vr,max = 0.25ϕcf'cbwdv

For sections with multiple values of f'_c, the minimum f'_c is used for maximum shear calculations.

ϕ_c for concrete is 0.65 per section 8.4.2

Shear resisted by concrete V_r ≤ V_r,max, otherwise a failure will be reported