Study of Pure Torsion in Open Thin Walled Sections using Finite Element Analysis
Generally, Open Thin Walled (OTW) cross sections are susceptible to torsional instability, due to their low torsional rigidity. Several analytical methods have been proposed to calculate the torsional deformation (warping) along the direction perpendicular to the cross section of such OTW sections when subjected to torsion. In this paper, we have analysed the warping in the OTW sections to validate that in case of pure torsion of such bars having free ends, the warping is uniform throughout the whole length of the bar and any line parallel to centroidal axis can be taken as axis of rotation. The finite element analysis using ABAQUS has been done to analyse the warping of such sections when subjected to pure torsion. This paper also represents the comparative study of warping distribution in OTW sections using the theoretical approach and Finite Element Modeling (FEM).
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