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Calculate Lateral-Torsional Buckling Modification Factor Cb:
For singly symmetric members in single curvature and all doubly symmetric members, calculate Cb, the lateral-torsional buckling modification factor for nonuniform moment diagrams when both ends of the segment are braced.
Absolute value of maximum moment in the unbraced segment (Mmax - kip-ft or kN-m)
Absolute value of moment at quarter point of the unbraced segment (MA - k-ft or kN-m)
Absolute value of moment at centerline of the unbraced segment (MB - k-ft or kN-m)
Absolute value of moment at three-quarter point of the unbraced segment (MC - k-ft or kN-m)
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Lateral-torsional buckling modification factor, Cb =
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