Shallow Foundation.

International Design Codes

ACI 318-19 : Shallow Foundation per ACI 318-19 with ideCAD

TSC 2018 :

Notation in ACI 318-19

A_g = gross area of concrete section, in²
A_s = area of nonprestressed longitudinal tension reinforcement, in²
E_c = modulus of elasticity of concrete, psi
E_s = modulus of elasticity of reinforcement, psi
f_c^' = specified compressive strength of concrete, psi
f_y = specified yield strength for nonprestressed reinforcement, psi
M_u = factored moment at section, in.-lb
β = ratio of long to short dimentions; clear spans for two-way slabs, sides of column, concentrated load or reaction area; or sides of a footing
γ_s = factor used to determine the portion of reinforcement located in center band of footing