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The design bending strength of laterally unsupported beams is governed by

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The design bending strength of laterally unsupported beams is governed by

(a) torsion

(b) bending

(c) lateral torsional buckling

(d) yield stress

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The doubt is from Design Strength of Laterally Unsupported Beams topic in division Design of Beams of Design of Steel Structures

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Right choice is (c) lateral torsional buckling

The best explanation: Beams with major axis bending and compression flange not restrained against lateral bending (or inadequate lateral support) fail by lateral torsional buckling before attaining their bending strength.

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