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000897
2023-12-29

Nominal Flexural Strength

The nominal flexural strength of a beam member

Mn = Cb Mp - (Mp - 0.7 · Fy · Sx) Lb - LpLr - Lp

Cb

Lateral-torsional buckling modification factor for non-uniform moment diagrams

Mp

Plastic flexural strength

Fy

Yield strength

Sx

Elastic section modulus taken about the x-axis

Lb

Distance between braces

Lp

Limiting laterally unbraced length for the limit state of yielding

Lr

Limiting laterally unbraced length for the limit state of inelastic lateral-torsional buckling
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