Mechanical properties of cold-formed steels at elevated temperatures
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01/01/2011
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Resumo |
Mechanical properties have an important role in the fire safety design of cold-formed steel structures due to the rapid reduction in mechanical properties such as yield strength and elastic modulus under fire conditions and associated reduction to the load carrying capacities. Hence there is a need to fully understand the deterioration characteristics of yield strength and elastic modulus of cold-formed steels at elevated temperatures. Although past research has produced useful experimental data on the mechanical properties of cold-formed steels at elevated temperatures, such data do not yet cover different cold-formed steel grades and thicknesses. Therefore, an experimental study was undertaken to investigate the elevated temperature mechanical properties of two low and high strength steels with two thicknesses that are commonly used in Australia. Tensile coupon tests were undertaken using a steady state test method for temperatures in the range 20–700 °C. Test results were compared with the currently available reduction factors for yield strength and elastic modulus, and stress–strain curves, based on which further improvements were made. For this purpose, test results of many other cold-formed steels were also used based on other similar studies undertaken at the Queensland University of Technology. Improved equations were developed to predict the yield strength and elastic modulus reduction factors and stress–strain curves of a range of cold-formed steel grades and thicknesses used in Australia. This paper presents the results of this experimental study, comparisons with the results of past research and steel design standards, and the new predictive equations. |
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application/pdf |
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Pergamon |
Relação |
http://eprints.qut.edu.au/43163/1/Dolamune%20Journal%20Paper%201.pdf DOI:10.1016/j.tws.2010.08.004 Dolamune Kankanamge, Nirosha & Mahendran, Mahen (2011) Mechanical properties of cold-formed steels at elevated temperatures. Thin-Walled Structures, 49(1), pp. 26-44. http://purl.org/au-research/grants/ARC/DP0986575 |
Direitos |
Copyright 2010 Elsevier Ltd. |
Fonte |
Faculty of Built Environment and Engineering; School of Urban Development |
Palavras-Chave | #090100 AEROSPACE ENGINEERING #090500 CIVIL ENGINEERING #091300 MECHANICAL ENGINEERING #Cold-formed steels, Elevated temperatures, Mechanical properties, Reduction factors, Yield strength, Elasticity modulus, Stress,strain model, Fire safety design |
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Journal Article |