H2Unsymmetric and other members subjected to flexure and axial force

This section addresses the interaction of flexure and axial stress for shapes not covered in Section H1. It is permitted to use the provisions of this section for any shape in lieu of the provisions of Section H1.

(H2-1)

where

• $\begin{aligned} f_{r a} & =\text { required axial stress at the point of consideration, determined in accordance with Chapter C, using LRFD or ASD load combinations, ksi } \\ & \text { (MPa) }\end{aligned}$
• $\begin{aligned} F_{c a} & =\text { available axial stress at the point of consideration, determined in accordance with Chapter E for compression or Section D2 for tension, ksi } \\ & \text { (MPa) }\end{aligned}$
• $\begin{aligned} f_{r b w}, f_{r b z} & =\text { required flexural stress at the point of consideration, determined in } \\ & \text { accordance with Chapter C, using LRFD or ASD load combinations, } \\ & \text { ksi (MPa) }\end{aligned}$

$F_{c b w}, F_{c b z}=$ available flexural stress at the point of consideration, determined in accordance with Chapter F, ksi (MPa). Use the section modulus, S, for the specific location in the cross section and consider the sign of the stress.

• $w$ = subscript relating symbol to major principal axis bending
• $\begin{aligned} z & =\text { subscript relating symbol to minor principal axis bending }\end{aligned}$

User Note: The subscripts $w$ and $z$ refer to the principal axes of the unsymmetric cross section. For doubly symmetric cross sections, these can be replaced by the $x$ and $y$ subscripts.

Equation H2-1 shall be evaluated using the principal bending axes by considering the sense of the flexural stresses at the critical points of the cross section. The flexural terms are either added to or subtracted from the axial term as applicable. When the axial force is compression, second-order effects shall be included according to the provisions of Chapter C.

A more detailed analysis of the interaction of flexure and tension is permitted in lieu of Equation H2-1.