Experimental study of the mechanical properties of light gauge cold-formed steels at elevated temperatures

Ranawaka, Thanuja & Mahendran, Mahen (2009) Experimental study of the mechanical properties of light gauge cold-formed steels at elevated temperatures. Fire Safety Journal, 44(2), pp. 219-229.

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In recent times, light gauge cold-formed steel sections have been used extensively as primary load bearing structural members in many applications in the building industry. Fire safety design of structures using such sections has therefore become more important. Deterioration of mechanical properties of yield stress and elasticity modulus is considered the most important factor affecting the performance of steel structures in fires. Hence there is a need to fully understand the mechanical properties of light gauge cold-formed steels at elevated temperatures. A research project based on experimental studies was therefore undertaken to investigate the deterioration of mechanical properties of light gauge cold-formed steels. Tensile coupon tests were undertaken to determine the mechanical properties of these steels made of both low and high strength steels and thicknesses of 0.60, 0.80 and 0.95 mm at temperatures ranging from 20 to 800ºC. Test results showed that the currently available reduction factors are unsafe to use in the fire safety design of cold-formed steel structures. Therefore new predictive equations were developed for the mechanical properties of yield strength and elasticity modulus at elevated temperatures. This paper presents the details of the experimental study, and the results including the developed equations. It also includes details of a stress-strain model for light gauge cold-formed steels at elevated temperatures.

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44 citations in Scopus
33 citations in Web of Science®
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ID Code: 30252
Item Type: Journal Article
Refereed: Yes
Keywords: Light gauge cold-formed steel, elevated temperatures, mechanical properties, reduction factors, yield strength, elasticity modulus, stress-strain model, fire safety design
DOI: 10.1016/j.firesaf.2008.06.006
ISSN: 0379-7112
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright Elsevier 2009
Deposited On: 04 Feb 2010 23:16
Last Modified: 29 Feb 2012 14:03

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