D4.B.6.1 Nomenclature

where

A	=	Area.
A_e	=	Effective area.
A_f	=	Area of flange.
A_w	=	Area of web.
b_e	=	Effective Flange width.
C_f	=	Compressive force in a member or component under factored load.
C_r	=	Factored compressive resistance.
C_w	=	Warping torsional constant.
C_y	=	Axial compressive load at yield stress.
D	=	Outside diameter of pipe section.
E	=	Elastic modulus of steel.
F_e	=	Elastic critical buckling stress.
F_y	=	Yield strength.
F_ye	=	Effective yield stress of section in compression to account for elastic local buckling.
h	=	Clear depth of web.
K	=	Effective length factor.
L	=	Length or span of member.
M_f	=	Bending moment in a member or component under factored load.
M_r	=	Factored moment resistance of a member.
M_y	=	Yield moment resistance.
S	=	Elastic section modulus.
S_e	=	Effective section modulus.
W	=	Web thickness.
λ	=	Non-dimensional slenderness parameter in column formula.
λ_ye	=	Effective non-dimensional slenderness parameter in column formula considering effective yield stress.
ϕ	=	Resistance factor