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Polymers 2014, 6(6), 1705-1726; doi:10.3390/polym6061705

The Effect of CFRP Length on the Failure Mode of Strengthened Concrete Beams

College of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China
School of Materials Science and Engineering, Southwest University, Chongqing 400715, China
Author to whom correspondence should be addressed.
Received: 9 April 2014 / Revised: 30 May 2014 / Accepted: 3 June 2014 / Published: 10 June 2014
(This article belongs to the Special Issue Fiber-Reinforced Polymer Composites in Structural Engineering)


This paper reports the effects of carbon fiber-reinforced polymer (CFRP) length on the failure process, pattern and crack propagation for a strengthened concrete beam with an initial notch. The experiments measuring load-bearing capacity for concrete beams with various CFRP lengths have been performed, wherein the crack opening displacements (COD) at the initial notch are also measured. The application of CFRP can significantly improve the load-bearing capacity, and the failure modes seem different with various CFRP lengths. The stress profiles in the concrete material around the crack tip, at the end of CFRP and at the interface between the concrete and CFRP are then calculated using the finite element method. The experiment measurements are validated by theoretical derivation and also support the finite element analysis. The results show that CFRP can significantly increase the ultimate load of the beam, while such an increase stops as the length reaches 0.15 m. It is also concluded that the CFRP length can influence the stress distribution at three critical stress regions for strengthened concrete beams. However, the optimum CFRP lengths vary with different critical stress regions. For the region around the crack tip, it is 0.15 m; for the region at the interface it is 0.25 m, and for the region at the end of CFRP, it is 0.30 m. In conclusion, the optimum CFRP length in this work is 0.30 m, at which CFRP strengthening is fully functioning, which thus provides a good reference for the retrofitting of buildings. View Full-Text
Keywords: carbon fiber-reinforced polymer (CFRP) length; failure mode; finite element method; strengthened concrete beams carbon fiber-reinforced polymer (CFRP) length; failure mode; finite element method; strengthened concrete beams

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ding, J.; Wang, F.; Huang, X.; Chen, S. The Effect of CFRP Length on the Failure Mode of Strengthened Concrete Beams. Polymers 2014, 6, 1705-1726.

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