Foundations of Earthquake-Resistant Structures.

International Design Codes

ACI 318-19 : Foundations of Earthquake-Resistant Structures 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_cr = cracking moment, in.-lb
M_u = factored moment at section, in.-lb