RC Slabs Strengthened with Prestressed and Gradually Anchored CFRP Strips under Monotonic and Cyclic Loading
Publication: Journal of Composites for Construction
Volume 15, Issue 2
Abstract
This paper presents the test results of reinforced concrete slabs strengthened with prestressed and gradually anchored carbon fiber–reinforced polymer (CFRP) strips under monotonic and cyclic loading. To take full advantage of the externally bonded CFRP technique, it is beneficial to apply the laminates in a prestressed state, which relieves the stress in the steel reinforcement and reduces crack widths and deflection. The aim of the monotonic tests was to determine the strengthening efficiency of the new prestressing technique and to investigate serviceability and ultimate states. The cyclic tests were performed to identify the fatigue behavior of the strengthened slabs and to investigate the influence of long-term cyclic loading and elevated temperature on the bond properties of the prestressed CFRP laminates and the ductility and flexural strength of the strengthened slabs. A nonlinear analytical model of reinforced concrete members strengthened with passive and prestressed CFRP strips under static loading is proposed in the paper. A comparison of the experimental and predicted results reveals an excellent agreement in the full range of loading.
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Acknowledgments
The writers would like to thank the EMPA for their support within the experimental part on this project and extend their sincere appreciation especially to Masoud Motavalli, the head of the Structural Laboratory.
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Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 2 • April 2011
Pages: 168 - 180
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 6, 2009
Accepted: Jun 3, 2010
Published online: Jun 8, 2010
Published in print: Apr 1, 2011
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