ACI 318-02

Shear

Section 11.5.5.3 Equation for shear reinforcement area minimum limit has changed. It now includes the concrete capacity, which it did not in ACI 318-99 code.

A_{v} = 0.75 \sqrt{{f^{'}}_{c}} \frac{b_{w} s}{f_{y}}

Equation ACI 11-13

A_{v} \geq 50 \frac{b_{w} s}{f_{y}}

Minimum Footing Thickness

Section 11.12.3 permits shear reinforcement only when the following minimum footing thickness limits are met:

d ≥ 6in.

d ≥ 16d_s

where

d_s

shear bar diameter

Minimum total flexural reinforcement in a given direction:

A_{\min} = A_{S}^{T} + A_{S}^{B}

> Sec. 7.12.2.1