Abstract
In this paper, an experimental and theoretical study on the shear behavior of rectangular reinforced concrete (RC) beams strengthened by CFRP grid with epoxy mortar was investigated. Based on the test parameters including the reinforcement ratio of CFRP grid, the shear span-to-effective depth ratio and the concrete strength, six beam specimens were prepared and carried out to reveal the their strengthening mechanism and performance improvement. In addition, a prediction model of shear capacity of strengthened beams was proposed for more reasonable prediction. The research results indicated that the shear capacity and crack patterns of RC beams strengthened with CFRP grid in shear can be effectively improved. There was a substantial influence on the shear strengthening effects under the same reinforcement ratio of CFRP grid, as changing the shear span-to-effective depth ratio and concrete strength, which should be paid more attention. A novel shear model was proposed to evaluate the shear capacity of CFRP grid-strengthened RC beams, and this proposed model appeared as a good predictor of shear capacity with sufficient accuracy and smaller dispersion, when compared to other four existing models.
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