AISCAISC 360-22
Formulas

Formulas: approximate inelastic moment redistribution

PDF page 354 · AISC 360-22

Equation A-8-9

Lm=[0.12+0.076(M1M2)](EFy)ryL_{m}=\left[0.12+0.076\left(\frac{M_{1}}{M_{2}}\right)\right]\left(\frac{E}{F_{y}}\right) r_{y}

Equation A-8-10

Lm=[0.17+0.10(M1M2)](EFy)ry≥0.10(EFy)ryL_{m}=\left[0.17+0.10\left(\frac{M_{1}}{M_{2}}\right)\right]\left(\frac{E}{F_{y}}\right)_{r_{y}} \geq 0.10\left(\frac{E}{F_{y}}\right)_{r_{y}}

where

Fy=F_{y}= specified minimum yield stress of the compression flange, ksi (MPa)

M1=M_{1}= smaller moment at end of unbraced length, kip-in. (N-mm)

M2=M_{2}= larger moment at end of unbraced length, kip-in. (N-mm)

Found in

Formulas: Multiplier $B_{2}$ for $P-\Delta$ Effects

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