Theoretical Model for Fiber-Reinforced Polymer-Confined Concrete
Publication: Journal of Composites for Construction
Volume 11, Issue 2
Abstract
Fiber-reinforced polymer (FRP) composites have found increasingly wide applications in civil engineering due to their high strength-to-weight ratio and high corrosion resistance. One important application of FRP composites is as a confining material for concrete, particularly in the strengthening or seismic retrofit of existing reinforced concrete columns by the provision of a FRP jacket. FRP confinement can enhance both the compressive strength and the ultimate strain of concrete significantly. This paper presents a new stress–strain model for FRP-confined concrete in which the responses of the concrete core and the FRP jacket as well as their interaction are explicitly considered. Such a model is often referred to as an analysis-oriented model. The key novel feature of the proposed analysis-oriented model, compared to existing models of the same kind, is a more accurate and more widely applicable lateral strain equation based on a careful interpretation of the lateral deformation characteristics of unconfined, actively confined, and FRP-confined concrete. Through comparisons with independent test data, the proposed model is shown to be accurate not only for FRP-confined concrete but also for concrete confined with a steel tube, demonstrating the wide applicability of the model to concrete confined with different confining materials. The accuracy of the proposed model is also shown to be superior to existing analysis-oriented stress-strain models through comparisons with test data.
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Acknowledgments
The writers are grateful for the financial support received from the Research Grants Council of the Hong Kong SAR (Project No. PolyU 5064/01E), the Natural Science Foundation of China (National Key Project No. 50238030), and The Hong Kong Polytechnic University provided through its Area of Strategic Development (ASD) Scheme for the ASD in Urban Hazard Mitigation.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 2 • April 2007
Pages: 201 - 210
Copyright
© 2007 ASCE.
History
Received: Jun 15, 2005
Accepted: May 26, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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