Size Effects for Reinforced Concrete Beams Strengthened in Shear with CFRP Strips
Publication: Journal of Composites for Construction
Volume 14, Issue 3
Abstract
The principal motivation of this study is to obtain a clear understanding of size effects for fiber-reinforced polymer (FRP) shear-strengthened beams. The experimental program consists of seven beams of various sizes grouped in three test series. One beam of each series is used as a benchmark and its behavior is compared with a beam strengthened with a U-shaped carbon FRP (CFRP) jacket. The third test series includes an additional beam strengthened with completely wrapped external CFRP sheets. The experimental results show that the effective axial strains of the CFRP sheets are higher in the smaller specimens. Moreover, with a larger beam size, one can expect less strain in the FRPs. A nonlinear finite-element numerical analysis is developed to model the behavior of the CFRP shear-strengthened beams. The numerical model is able to simulate the characteristics of the shear-strengthened beams, including the interfacial behavior between the concrete and the CFRP sheets. Three prediction models available in current design guidelines for computing the CFRP effective strain and shear contribution to the shear capacity of the CFRP shear-strengthened beams are compared with the experimental results.
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Acknowledgments
This research was funded in part by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Network of Centers of Excellence on Intelligent Sensing for Innovative Structures (ISIS Canada). K.W.N. is Canada Research Chair in Advanced Engineered Material Systems, and the support of this program is gratefully acknowledged.UNSPECIFIED
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 3 • June 2010
Pages: 260 - 271
Copyright
© 2010 ASCE.
History
Received: Feb 6, 2009
Accepted: Sep 3, 2009
Published online: Feb 5, 2010
Published in print: Jun 2010
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