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Lateral torsional buckling behaviour of cold-formed steel beams at elevated temperatures

Dolamune Kankanamge, Nirosha & Mahendran, Mahen (2011) Lateral torsional buckling behaviour of cold-formed steel beams at elevated temperatures. In 6th International Conference on Thin-walled Structures, 5-7 September 2011, Timisoara, Romania.

Abstract

Abstract: This paper presents the details of a study into the behaviour and moment capacities of cold-formed steel lipped channel beams (LCB) subject to lateral-torsional buckling at elevated temperatures. It was based on a validated numerical model of a simply supported and laterally unrestrained LCB subjected to a uniform moment. The ultimate moment capacities from this study were compared with the predicted values using ambient and fire design methods. This study showed that the lateral torsional buckling capacity is strongly influenced by the level of non-linearity in the stress-strain curves of steel at elevated temperatures. Hence most of the current design methods based on a single buckling curve were not adequate to determine the moment capacities. This paper proposes a new design method for the cold-formed steel LCBs subject lateral-torsional buckling at elevated temperatures.

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ID Code: 49381
Item Type: Conference Paper
Additional URLs:
Keywords: LATERAL TORSIONAL BUCKLING, COLD-FORMED STEEL BEAMS, ELEVATED TEMPERATURES
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
  • ARC DISCOVERY GRANT/DP0986575
Copyright Owner: Copyright 2011 [please consult the author]
Deposited On: 29 Mar 2012 12:32
Last Modified: 09 Jul 2014 19:23

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