Influence of Fiber-Reinforced Polymer Sheets on the Constitutive Relationships of Reinforced Concrete Elements
Publication: Journal of Composites for Construction
Volume 20, Issue 2
Abstract
Fiber-reinforced polymer (FRP) started to find its way as an economical alternative material in civil engineering in the early 1970s. The behavior and failure modes for FRP composite structures were studied through extensive experimental and analytical investigations. Although research related to the flexural behavior of FRP-strengthened elements has reached a mature phase, studies related to FRP shear strengthening are less advanced. In all proposed models to predict shear capacity, the constitutive behaviors of concrete and FRP are described independently. The true behavior, however, should account for the high level of interaction between the two materials. Constitutive relations for FRP-strengthened reinforced concrete (RC) elements should provide a better understanding of the shear behavior of the composite structure. To generate these relations, large-scale tests of a series of FRP-strengthened RC panel elements subjected to pure shear were conducted. This paper presents the results of the test program and the calibration of the parameters of the constitutive model. These constitutive laws could easily be implemented in finite-element models to predict the behavior of externally bonded FRP-strengthened beams. The focus in this work is on elements failing because of concrete crushing and not because of FRP debonding. The newly developed model provides a good level of accuracy when compared with experimental results.
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Acknowledgments
This research was supported by the National Science Foundation, award number 1100930. The authors wish to thank Fyfe Co. LLC., which generously donated the FRP material used in this study, and Gerdau Ameristeel Co., which donated the steel reinforcement. The opinions expressed in this study are those of the authors and do not necessarily reflect the views of the sponsors.
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Journal of Composites for Construction
Volume 20 • Issue 2 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 16, 2014
Accepted: Jul 13, 2015
Published online: Sep 22, 2015
Discussion open until: Feb 22, 2016
Published in print: Apr 1, 2016
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