Limiting Laterally Unbraced Length

A length between the points that are either braced against lateral displacement of the compression flange or braced against twist of the cross-section

L_{b} = 1.76 \cdot r_{y} \cdot \sqrt{\frac{E}{F_{y}}}

L_b	Limiting laterally unbraced length for the limit state of yielding
r_y	Radius of gyration about the y-axis
E	Modulus of elasticity
F_y	Yield strength

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