Behaviour and design of cold-formed steel beams subject to lateral-torsional buckling at elevated temperatures

Dolamune Kankanamge, Nirosha & Mahendran, Mahen (2012) Behaviour and design of cold-formed steel beams subject to lateral-torsional buckling at elevated temperatures. Thin Walled Structures, 61, pp. 213-228.

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Cold-formed steel beams are increasingly used as floor joists and bearers in buildings and often their behaviour and moment capacities are influenced by lateral-torsional buckling. With increasing usage of cold-formed steel beams their fire safety design has become an important issue. Fire design rules are commonly based on past research on hot-rolled steel beams. Hence a detailed parametric study was undertaken using validated finite element models to investigate the lateral-torsional buckling behaviour of simply supported cold-formed steel lipped channel beams subjected to uniform bending at uniform elevated temperatures. The moment capacity results were compared with the predictions from the available ambient temperature and fire design rules and suitable recommendations were made. European fire design rules were found to be over-conservative while the ambient temperature design rules could not be used based on single buckling curve. Hence a new design method was proposed that includes the important non-linear stress-strain characteristics observed for cold-formed steels at elevated temperatures. Comparison with numerical moment capacities demonstrated the accuracy of the new design method. This paper presents the details of the parametric study, comparisons with current design rules and the new design rules proposed in this research for lateral-torsional buckling of cold-formed steel lipped channel beams at elevated temperatures.

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ID Code: 56493
Item Type: Journal Article
Refereed: Yes
Funders: ARC
Keywords: Cold-formed steel structures, Lipped channel beams, Lateral-torsional buckling, Finite element analyses, Fire design rules, Elevated temperatures
DOI: 10.1016/j.tws.2012.05.009
ISSN: 0263-8231
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
Copyright Owner: Copyright 2012 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Thin Walled Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Thin Walled Structures, [VOL 61, (2012)] DOI: 10.1016/j.tws.2012.05.009
Deposited On: 16 Jan 2013 22:46
Last Modified: 23 May 2017 01:42

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