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Improvements to the design of Litesteel Beams undergoing lateral distortional buckling

Tharmarajah, Anapayan & Mahendran, Mahen (2009) Improvements to the design of Litesteel Beams undergoing lateral distortional buckling. In 9th International Conference on Steel Concrete Composite and Hybrid Structures, 8-10 July 2009, University of Leeds, Leeds.

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Abstract

An Australian manufacturer has recently developed an innovative group of cold-formed steel hollow flange sections, one of them is LiteSteel Beams (LSBs). The LSB sections are produced from thin and high strength steels by a patented manufacturing process involving simultaneous cold-forming and dual electric resistance welding. They have a unique geometry consisting of rectangular hollow flanges and a relatively slender web. The LSB flexural members are subjected to lateral distortional buckling effects and hence their capacities are reduced for intermediate spans. The current design rules for lateral distortional buckling were developed based on the lower bound of numerical and experimental results. The effect of LSB section geometry was not considered although it could influence the lateral distortional buckling performance. Therefore an accurate finite element model of LSB flexural members was developed and validated using experimental and finite strip analysis results. It was then used to investigate the effect of LSB geometry. The extensive moment capacity data thus developed was used to develop improved design rules for LSBs with one of them considering the LSB geometry effects through a modified slenderness parameter. The use of the new design rules gave higher lateral distortional buckling capacities for LSB sections with intermediate slenderness. The new design rule is also able to accurately predict the lateral distortional buckling moment capacities of other hollow flange beams (HFBs).

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ID Code: 26553
Item Type: Conference Paper
Additional URLs:
Keywords: Lateral Distortional Buckling, LiteSteel Beams, Hollow Flange Beams
ISBN: 9789810830687
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2009 [please consult the authors]
Deposited On: 31 Jul 2009 07:51
Last Modified: 29 Feb 2012 23:54

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