Elevated temperature material properties of stainless steel reinforcing bar

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Title: Elevated temperature material properties of stainless steel reinforcing bar
Authors: Gardner, L
Bu, Y
Francis, P
Baddoo, NR
Cashell, KA
McCann, F
Item Type: Journal Article
Abstract: Corrosion of carbon steel reinforcing bar can lead to deterioration of concrete structures, especially in regions where road salt is heavily used or in areas close to sea water. Although stainless steel reinforcing bar costs more than carbon steel, its selective use for high risk elements is cost-effective when the whole life costs of the structure are taken into account. Considerations for specifying stainless steel reinforcing bars and a review of applications are presented herein. Attention is then given to the elevated temperature properties of stainless steel reinforcing bars, which are needed for structural fire design, but have been unexplored to date. A programme of isothermal and anisothermal tensile tests on four types of stainless steel reinforcing bar is described: 1.4307 (304L), 1.4311 (304LN), 1.4162 (LDX 2101®) and 1.4362 (2304). Bars of diameter 12 mm and 16 mm were studied, plain round and ribbed. Reduction factors were calculated for the key strength, stiffness and ductility properties and compared to equivalent factors for stainless steel plate and strip, as well as those for carbon steel reinforcement. The test results demonstrate that the reduction factors for 0.2% proof strength, strength at 2% strain and ultimate strength derived for stainless steel plate and strip can also be applied to stainless steel reinforcing bar. Revised reduction factors for ultimate strain and fracture strain at elevated temperatures have been proposed. The ability of two-stage Ramberg-Osgood expressions to capture accurately the stress-strain response of stainless steel reinforcement at both room temperature and elevated temperatures is also demonstrated.
Issue Date: 12-Apr-2016
Date of Acceptance: 3-Apr-2016
URI: http://hdl.handle.net/10044/1/38732
DOI: https://dx.doi.org/10.1016/j.conbuildmat.2016.04.009
ISSN: 0950-0618
Publisher: Elsevier
Start Page: 977
End Page: 997
Journal / Book Title: Construction and Building Materials
Volume: 114
Copyright Statement: © 2016 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Technology
Construction & Building Technology
Engineering, Civil
Materials Science, Multidisciplinary
Engineering
Materials Science
Anisothermal
Constitutive law
Elevated temperature
Fire design
Reinforced concrete
Rebar
Reinforcing bar
Isothermal
Material modelling
Stainless steel
Stress strain
Structures
Building & Construction
Civil Engineering
Building
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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