Column Required and Design Strength.

İnternational Design Codes

ACI 318-19 : https://idecad.atlassian.net/wiki/spaces/T2EB/pages/1804406215

TSC 2018 : Axial Force and Biaxial Moment Interaction for Columns Column Shear Design Forces

Notation in ACI 318-19

D = dead load
E = earthquake load
L = live load
L_r = roof live load
M_n = nominal flexural strength at section, in.-lb
M_u = factored moment at section, in.-lb
P_n = nominal axial compressive strength of member, lb
P_u = factored axial force; to be taken as positive for compression and negative for tension, lb
R = rain load
S = snow load
T_n = nominal torsional moment strength, in.-lb
T_u = factored torsional moment at section, in.-lb
U = strength of a member or cross section required to resist factored loads
V_n = nominal shear strength, lb
V_u = factored shear force at section, lb
W = wind load
ϕ = strength reduction factor