Design-Oriented Stress–Strain Model for Concrete under Combined FRP-Steel Confinement
Publication: Journal of Composites for Construction
Volume 20, Issue 4
Abstract
Extensive research has been conducted on fiber-reinforced polymer (FRP)-confined plain and RC columns, leading to a large number of stress–strain models. Most of these models have been developed for FRP-confined plain concrete and are thus applicable only to concrete in FRP-confined RC columns with a negligible amount of transverse steel reinforcement. The few models that have been developed for concrete under the combined confinement of FRP and transverse steel reinforcement are either inaccurate or too complex for direct use in design. This paper presents an accurate design-oriented stress–strain model for concrete under combined FRP-steel confinement in FRP-confined circular RC columns. The proposed model is formulated on the basis of extensive numerical results generated using an analysis-oriented stress–strain model recently proposed by the authors and properly captures the key characteristics of FRP-steel-confined concrete as revealed by existing test results. The model strikes a good balance between accuracy of prediction and simplicity of form and is shown to provide close predictions of test results and perform significantly better than existing stress–strain models of the same type.
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Acknowledgments
The authors are grateful for the financial support received from the Research Grants Council of the Hong Kong Special Administrative Region (Project PolyU 152153/14E), the National Basic Research Program (i.e., 973 Program) (Project 2012CB026200) as well as the Australian Research Council through a Discovery Early Career Researcher Award (Project ID: DE140101349) for the second author.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 4 • August 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 9, 2015
Accepted: Sep 24, 2015
Published online: Dec 18, 2015
Discussion open until: May 18, 2016
Published in print: Aug 1, 2016
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