Formulas: Compressive Strength

Equation C-E6-1

where

$B_{1}=$ multiplier to account for $P-\delta$ effects (Appendix 8)

• $I_{y}=$ moment of inertia of the built-up section about the $y$-axis, the axis that puts shear in the connectors, in. ${ }^{4}\left(\mathrm{~mm}^{4}\right)$
• $L \quad=$ length of member, in. (mm)
• $P_{r}=$ required axial compressive strength, kips (N)
• $Q_{y}=$ first moment of the area of one component about the $y$-axis, in. ${ }^{3}\left(\mathrm{~mm}^{3}\right)$
• $\alpha=1.0$ (LRFD); 1.6 (ASD)

Found in

• BUILT-UP MEMBERS