The design bending strength of laterally unsupported beams is governed by(a) torsion(b) bending(c) lateral torsional buckling(d) yield stressI had been asked this question in quiz.The doubt is from Design Strength of Laterally Unsupported Beams topic in division Design of Beams of Design of Steel Structures

The design bending strength of laterally unsupported beams is governed

1.	The design bending strength of laterally unsupported beams is governed by(a) torsion(b) bending(c) lateral torsional buckling(d) yield stressI had been asked this question in quiz.The doubt is from Design Strength of Laterally Unsupported Beams topic in division Design of Beams of Design of Steel Structures
Answer» 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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