1.

Elastic critical moment for long shallow girders is given by(a) (π/L){√(EIyGIt)}(b) (πL){√(EIyGIt)}(c) (π/L){√(EIy /GIt)}(d) (πL){√(EIy/GIt)}I have been asked this question during an interview.Question is taken from Lateral Torsional Buckling topic in chapter Design of Beams of Design of Steel Structures

Answer»

Correct answer is (a) (π/L){√(EIyGIt)}

To elaborate: Long shallow GIRDERS have low warping stiffness or resistance. So, elastic critical moment for long shallow girders is GIVEN by (π/L){√(EIyGIt)}, where EIy = flexural rigidity(minor axis), GIT = torsional rigidity, L = unbraced length of BEAM subjected to constant moment in PLANE of web.



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