Formulas: Limitations

Equation A-7-1

• (b) The required axial compressive strengths in nominally horizontal members in moment frames subjected to bending satisfy the following limitation:

Formula 2

$P_{e}=\pi^{2} E I / L^{2}$, kips (N)

Equation A-7-2

• (d) The required axial compressive strengths of all members whose flexural stiffnesses are considered to contribute to the lateral stability of the structure satisfy the following limitation:

where

$\begin{aligned} P_{n s} & =\text { cross-section compressive strength; for nonslender-element sections, } \\ P_{n s} & =F_{y} A_{g} \text {, and for slender-element sections, } P_{n s}=F_{y} A_{e} \text {, where } A_{e} \text { is as } \\ & \text { defined in Section E7 with } F_{n}=F_{y}, \text { kips (N) }\end{aligned}$

Found in

• FIRST-ORDER ANALYSIS METHOD