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What is elastic critical moment?

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What is elastic critical moment?

(a) bending moment at which beam do not fail by lateral buckling

(b) bending moment at which beam fails by lateral buckling

(c) shear force at which beam do not fail by lateral buckling

(d) shear force at which beam fails by lateral buckling

This question was addressed to me by my school principal while I was bunking the class.

This intriguing question comes from Lateral Stability of Beams topic in portion Design of Beams of Design of Steel Structures

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The correct option is (b) bending moment at which beam fails by lateral buckling

Easiest explanation: Bending moment at which beam fails by lateral buckling when subjected to a uniform end moment is called elastic critical moment.

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