Torsional Buckling Essay

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Literature review

Introduction
Because of its importance in the design of steel beams, lateral torsional buckling continues to attract many researchers’ attention. Lateral torsional buckling is a limit-state of structural usefulness where the deformation of a beam changes mainly from in-plane deflection to a combination of lateral deflection and twisting while the load capacity of the beam remains constant, before dropping off due to large deflection. The main factors affecting the LTB are dimensions of the beam, support conditions and type and application of the load. This literature review discuss about the lateral torsional buckling of steel beams, behavior of welded I-beam, stress and strain distribution due to LTB, and other topics related with this research.

Lateral torsional buckling of steel beams
According to (Prof. S.R.Satish Kumar and Prof. A.R.Santha Kumar) the factors affecting the lateral-torsional buckling strength are:
• Distance between lateral bracing to the compression flange. The distance between lateral braces has considerable influence on the lateral torsional buckling of the beams.
• Restraints at the ends and at intermediate locations.
The restraints such as twisting restraint and lateral deflection restraint tend to increase the load capacity of the beam.
• Type and position of the load along the beam.
If
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The buckling resistance is obtained multiplying the resistance of the cross section by a reduction factor χLT. The reduction factor is a function of imperfection factor (αLT) and the non-dimensional slenderness LT, the non-dimensional slenderness LT depends on the elastic critical moment Mcr for lateral torsional buckling and Eurocode 3 does not provide any information on how to compute Mcr. According to (Eurocode 3) the values of the imperfection factor αLT for lateral torsional buckling should be taken

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