Fracture Analysis of FRP-Plated Notched Concrete Beams Subjected to Three-Point Bending
Publication: Journal of Engineering Mechanics
Volume 142, Issue 3
Abstract
Three-point bending tests of fiber-reinforced polymer (FRP) plated notched concrete beams have great potential to become a standard test method for evaluating the shear bond performance of FRP-to-concrete interfaces. This paper presents an analytical approach to predict the full-range response of FRP-plated notched concrete beams. The focus of the analysis is to simulate the interactions between Mode II debonding of the FRP-to-concrete interface and Mode I fracture at the crack tip of the concrete beam. In analyzing the FRP-to-concrete interface, the slip is selected as the unknown function to derive a second-order ordinary differential equation, and the analytical relationship between the pull force of the FRP laminate and the interfacial slip at its loaded end is formulated. Crack propagation in concrete is modeled using the weight function method. The stress intensity factors induced by various external loads and internal forces are all given in an analytical manner. Finally, a global equation with one single unknown is established. The equation can be solved easily and good convergence is assured. The derived analytical solutions are verified with experimental results obtained from the literature. Further parametric studies reveal quantitatively the effects of various factors on the load-crack mouth opening displacement (CMOD) curve of the FRP-plated concrete beam, which is found to be characterized by two peak loads. The first and second peak loads increase with the increase in the strength of concrete, the thickness of the FRP laminate, and the interfacial bond strength. It is also found that increasing the initial crack length decreases the first peak load but exerts no effect on the second peak load.
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Acknowledgments
The authors are grateful for the financial support received from the Research Grants Council of the Hong Kong SAR (No. PolyU 514311) and the National Natural Science Foundation of China (Nos. 51278441 and 51379188).
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 3, 2014
Accepted: Sep 3, 2015
Published online: Oct 20, 2015
Published in print: Mar 1, 2016
Discussion open until: Mar 20, 2016
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