Shear Strengthening of Reinforced Concrete Beams Using Carbon-Fiber-Reinforced Polymer Laminates
Publication: Journal of Composites for Construction
Volume 9, Issue 2
Abstract
Shear failure is catastrophic and occurs usually without advance warning; thus it is desirable that the beam fails in flexure rather than in shear. Many existing reinforced concrete (RC) members are found to be deficient in shear strength and need to be repaired. Externally bonded reinforcement such as carbon-fiber-reinforced polymer (CFRP) provides an excellent solution in these situations. To investigate the shear behavior of RC beams with externally bonded CFRP shear reinforcement, 11 RC beams without steel shear reinforcement were cast at the concrete laboratory of the New Jersey Institute of Technology. After the beams were kept in the curing room for , carbon-fiber strips and fabrics made by Sika Corp. were applied on both sides of the beams at various orientations with respect to the axis of the beam. All beams were tested on a MTS testing machine. Results of the test demonstrate the feasibility of using an externally applied, epoxy-bonded CFRP system to restore or increase the shear capacity of RC beams. The CFRP system can significantly increase the serviceability, ductility, and ultimate shear strength of a concrete beam; thus, restoring beam shear strength by using CFRP is a highly effective technique. An analysis and design method for shear strengthening of externally bonded CFRP has been proposed.
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Acknowledgment
The CFRP laminates and epoxy used in this research were provided by Sika Corporation, N.J. The help and expertise on CFRP application by Mr. David White of Sika Corp. is gratefully acknowledged.
References
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 9 • Issue 2 • April 2005
Pages: 158 - 169
Copyright
© 2005 ASCE.
History
Received: Jan 16, 2003
Accepted: Aug 18, 2004
Published online: Apr 1, 2005
Published in print: Apr 2005
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