Elevated temperature mechanical properties of hollow flange channel sections

Kesawan, Sivakumar, Jatheeshan, Varathananthan, & Mahendran, Mahen (2015) Elevated temperature mechanical properties of hollow flange channel sections. Construction and Building Materials, 87, pp. 86-99.

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Abstract

The fire performance of cold-formed steel members is an important criterion to be verified for their successful use in structural applications. However, lack of clear design guidance on their fire performance has inhibited their usage in buildings. Their elevated temperature mechanical properties, i.e., yield strengths, elastic moduli and stress–strain relationships, are imperative for the fire design. In the past many researchers have proposed elevated temperature mechanical property reduction factors for cold-formed steels, however, large variations exist among them. The LiteSteel Beam (LSB), a hollow flange channel section, is manufactured by a combined cold-forming and electric resistance welding process. Its web, inner and outer flange elements have different yield strengths due to varying levels of cold-working caused by their manufacturing process. Elevated temperature mechanical properties of LSBs are not the same even within their cross-sections. Therefore an experimental study was undertaken to determine the elevated temperature mechanical properties of steel plate elements in LSBs. Elevated temperature tensile tests were performed on web, inner and outer flange specimens taken from LSBs, and their results are presented in this paper including their comparisons with previous studies. Based on the test results and the proposed values from previous studies and fire design standards, suitable predictive equations are proposed for the determination of elevated temperature mechanical properties of LSB web and flange elements. Suitable stress–strain models are also proposed for the plate elements of this cold-formed and welded hollow flange channel section.

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9 citations in Scopus
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7 citations in Web of Science®

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ID Code: 89632
Item Type: Journal Article
Refereed: Yes
Keywords: Cold-formed steel structures, Fire design, Elevated temperatures, Mechanical properties, Tensile testing
DOI: 10.1016/j.conbuildmat.2015.03.107
ISSN: 0950-0618
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Elsevier Ltd.
Deposited On: 29 Oct 2015 01:28
Last Modified: 01 Nov 2015 04:45

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