Improving the moment capacities of hollow flange cold-formed Litesteel Beams using web stiffeners

Tharmarajah, Anapayan & Mahendran, Mahen (2013) Improving the moment capacities of hollow flange cold-formed Litesteel Beams using web stiffeners. In Rehabilitation and Restoration of Structures : Proceedings of an International Conference, Indian Institute of Technology Madras, Chennai, India, pp. 423-434.

Abstract

The LiteSteel Beam (LSB) is a new hollow flange section developed in Australia with a unique geometry consisting of torsionally rigid rectangular hollow flanges and a relatively slender web. The LSB is subjected to a relatively new Lateral Distortional Buckling (LDB) mode when used as flexural members. Unlike the commonly observed lateral torsional buckling, lateral distortional buckling of LSBs is characterised by cross sectional change due to web distortion. Lateral distortional buckling causes significant moment capacity reduction for LSBs with intermediate spans. Therefore a detailed investigation was undertaken to determine the methods of reducing the effects of lateral distortional buckling in LSB flexural members. For this purpose the use of web stiffeners was investigated using finite element analyses of LSBs with different web stiffener spacing and sizes. It was found that the use of 5 mm steel plate stiffeners welded or screwed to the inner faces of the top and bottom flanges at third span points considerably reduced the lateral distortional buckling effects in LSBs. Suitable design rules were then developed to calculate the enhanced elastic lateral distortional buckling moments and the higher ultimate moment capacities of LSBs with the chosen web stiffener arrangement. This paper presents the details of this investigation and the results.

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ID Code: 57769
Item Type: Conference Paper
Refereed: Yes
Keywords: LiteSteel Beam (LSB), Moment capacity, Web stiffener, Hollow flange section, Finite element models
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 [please consult the author]
Deposited On: 04 Mar 2013 22:59
Last Modified: 16 Mar 2013 15:29

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