Flexural–torsional buckling behaviour and design of cold-formed steel compression members at elevated temperatures

Gunalan, Shanmuganathan, Heva, Yasintha Bandula, & Mahendran, Mahen (2014) Flexural–torsional buckling behaviour and design of cold-formed steel compression members at elevated temperatures. Engineering Structures, 79, pp. 149-168.

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Abstract

Current design rules for the member capacities of cold-formed steel columns are based on the same non-dimensional strength curve for both fixed and pinned-ended columns at ambient temperature. This research has investigated the accuracy of using current ambient temperature design rules in Australia/New Zealand (AS/NZS 4600), American (AISI S100) and European (Eurocode 3 Part 1.3) standards in determining the flexural–torsional buckling capacities of cold-formed steel columns at uniform elevated temperatures using appropriately reduced mechanical properties. It was found that these design rules accurately predicted the member capacities of pin ended lipped channel columns undergoing flexural torsional buckling at elevated temperatures. However, for fixed ended columns with warping fixity undergoing flexural–torsional buckling, the current design rules significantly underestimated the column capacities as they disregard the beneficial effect of warping fixity. This paper has therefore recommended the use of improved design rules developed for ambient temperature conditions to predict the axial compression capacities of fixed ended columns subject to flexural–torsional buckling at elevated temperatures within AS/NZS 4600 and AISI S100 design provisions. The accuracy of the proposed fire design rules was verified using finite element analysis and test results of cold-formed lipped channel columns at elevated temperatures except for low strength steel columns with intermediate slenderness whose behaviour was influenced by the increased nonlinearity in the stress–strain curves at elevated temperatures. Further research is required to include these effects within AS/NZS 4600 and AISI S100 design rules. However, Eurocode 3 Part 1.3 design rules can be used for this purpose by using suitable buckling curves as recommended in this paper.

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ID Code: 76312
Item Type: Journal Article
Refereed: Yes
Keywords: Cold-formed Steel Columns, Elevated Temperatures, Flexural-torsional Buckling, Finite Element Modelling, Design Rules
DOI: 10.1016/j.engstruct.2014.07.036
ISSN: 0141-0296
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Engineering 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 Engineering Structures, [VOL 79, (2014)] DOI: 10.1016/j.engstruct.2014.07.036
Deposited On: 23 Sep 2014 23:40
Last Modified: 29 Nov 2016 13:42

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