Faculty Publications
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Item The Overview and Application of Generalised Beam Theory in Buckling Analysis of Thin-Walled Structures(Springer Science and Business Media Deutschland GmbH, 2023) Baburaj, A.; Jeyapragasam, V.V.K.The analysis of structural response of cold-formed steel compression members is critical since its ultimate strength is significantly influenced by its buckling capacity.In this case, failure of members can occur with independent local, distortional, global buckling modes or with its interactive mode.Finite element methods employed for performing buckling analysis of cold-formed steel sections proved to be ineffective in depicting the contribution of each mode involved in the buckling deformation.However, a modal-based generalised beam theory (GBT) eliminates this disadvantage and provides the most efficient method for buckling/vibration analysis of thin-walled sections having complex geometries.The use of GBT-based formulations (i) considers the local and distortional buckling effects due to slender elements in cross section and global buckling effects due to member slenderness and (ii) provides the detail of modal contribution of every mode considered in the analysis.The finite element approach embedded in GBT for performing the member analysis for possible loading and support conditions unveils the complete deflection and buckling behaviour of the member.This article illustrates the state-of-the-art report about the generalised beam theory and its various applications on static and buckling analysis.The advancements in GBT are presented concisely.Further, the concepts involved in the cross-sectional analysis and the formulation of first and second-order theories in buckling analysis are discussed with their applications. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Local buckling strength enhancement due to non-slender flanges in web perforated plain channel columns(Elsevier Ltd, 2025) Francis, R.; Shabhari, A.; Jeyapragasam, V.V.K.; Chandrasekar, D.Cold-formed steel columns are the primary compression members in housing and industrial storage racks, with discrete holes or closely spaced web perforations. The element slenderness and web perforations influence the local buckling capacity. This study examines the local buckling capacity of slender web plain channel cross-sections with non-slender or slender flanges in the presence of web perforations. Fourteen plain channel stub column tests were conducted on two cross-section aspect ratios, two perforation shapes, with three perforation orientations. Further, a comprehensive parametric study was conducted using validated Finite Element models. The local buckling strength of unperforated and web-perforated cold-formed plain channel columns is evaluated using the Direct Strength Method (DSM) and Modified Direct Strength Method (MDSM). The increase in local buckling strength due to non-slender flanges becomes significant, depending on the aspect ratio and non-dimensional local buckling slenderness ratio of the plain channel cross-section. This research provides the scope to expand the applicability of DSM and MDSM design strength predictions from cold-formed steel design to general thin-walled steel sections, where the welded thin-walled steel sections can have different element thicknesses. As the element thickness plays a crucial role in element slenderness and inter-element interaction, the local buckling capacity prediction available for uniform cross-section thickness can be unduly conservative. This study highlights the significance of element slenderness and effective area reduction due to perforation shape and orientation in the local buckling strength of cold-formed plain channel sections. © 2025 Institution of Structural Engineers. Published by Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.