Numerical modelling of light gauge cold-formed steel compression members subjected to distortional buckling at elevated temperatures

Ranawaka, R & Mahendran, Mahen (2010) Numerical modelling of light gauge cold-formed steel compression members subjected to distortional buckling at elevated temperatures. Thin-Walled Structures, 48(4-5), pp. 334-344.

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Abstract

Fire safety design of building structures has received greater attention in recent times due to continuing loss of properties and lives during fires. However, fire performance of light gauge cold-formed steel structures is not well understood despite its increased usage in buildings. Cold-formed steel compression members are susceptible to various buckling modes such as local and distortional buckling and their ultimate strength behaviour is governed by these buckling modes. Therefore a research project based on experimental and numerical studies was undertaken to investigate the distortional buckling behaviour of light gauge cold-formed steel compression members under simulated fire conditions. Lipped channel sections with and without additional lips were selected with three thicknesses of 0.6, 0.8, and 0.95 mm and both low and high strength steels (G250 and G550 steels). More than 150 compression tests were undertaken first at ambient and elevated temperatures. Finite element models of the tested compression members were then developed by including the degradation of mechanical properties with increasing temperatures. Comparison of finite element analysis and experimental results showed that the developed finite element models were capable of simulating the distortional buckling and strength behaviour at ambient and elevated temperatures up to 800 °C. The validated model was used to determine the effects of mechanical properties, geometric imperfections and residual stresses on the distortional buckling behaviour and strength of cold-formed steel columns. This paper presents the details of the numerical study and the results. It demonstrated the importance of using accurate mechanical properties at elevated temperatures in order to obtain reliable strength characteristics of cold-formed steel columns under fire conditions.

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ID Code: 43233
Item Type: Journal Article
Refereed: Yes
Funders: ARC
Keywords: Light gauge cold-formed steel members, Distortional buckling, Numerical modelling, Elevated temperatures, Fire safety design
DOI: 10.1016/j.tws.2009.11.004
ISSN: 0263-8231
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AEROSPACE ENGINEERING (090100)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Funding:
Copyright Owner: Copyright 2009 Elsevier Ltd.
Deposited On: 13 Jul 2011 13:10
Last Modified: 28 Aug 2015 04:03

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