Lateral Torsional Buckling (LTB) is a failure criteria for beams in flexure. The AISC defines Lateral Torsional Buckling as: the buckling mode of a flexural member involving deflection normal to the plane of bending occurring simultaneously with twist about the shear center of the cross-section. LTB occurs when the compression portion of a beam is no longer sufficient in strength and instead the beam is restrained by the tension portion of the beam (which causes deflection or twisting to occur). The design buckling (bending) resistance moment of laterally unsupported beams are calculated as per Section 8.2.2,IS 800:2007 of the code. If the non-dimensional slenderness λLT ≤ 0.4, no allowance for lateral-torsional buckling is necessary. ANNEX E (CL.220.127.116.11,IS 800:2007) of the code gives the method of calculating Mcr,, the elastic lateral torsional buckling moment for different beam sections, considering loading and a support condition as well as for nonprismatic members. Elastic critical moment Mcr can be obtained using FE modeling techniques. The effects of various parameters such as shear force, bending moment are to be studied analytically
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