Abstract
In this study, experimental work was carried out on reinforced concrete (RC) beams strengthened with carbon fiber reinforced polymers (CFRP) plates. This study aims to examine the effect of the reinforcement ratio on the flexural behavior of these beams and propose a new model for predicting the debonding moment. Six RC beams consisting of three control beams and three beams strengthened with CFRP plates were tested. The beams were simply supported and loaded with four-point bending. The test variable was the tensile reinforcement ratio (1%, 1.5%, and 2.5%). Analytical prediction using the fiber element method was also carried out to obtain the complete theoretical response of the beam due to flexural loads. The test results show that the reinforcement ratio affected the bending performance of RC beams with CFRP plates. Following this, the experimental data from 60 beam test results from published literature and this study were analyzed. From these data, it was found that the ratio of tensile reinforcement, the ratio of modulus of elasticity of concrete, the modulus of elasticity of the plate, and plate thickness all affect the value of debonding moment. A parametric study using fiber elements and the two-dimensional finite element method was also carried out to confirm the effect of these variables on debonding failure. These variables were then used to develop an equation to predict the debonding moment of RC beams strengthened with CFRP plates, using simple statistical analysis. This analysis resulted in a simple model for predicting the debonding moment. Then the model is entered into a computer program, and the complete response of the cross-section due to debonding failure can be obtained.
Highlights
Buildings that experience deterioration in strength, damage, or changes in the design code during their service lifetime need to be strengthened or repaired to meet design code specifications
Bending capacity and debonding load of six reinforced concrete beams with and without Carbon Fiber Reinforced Polymer (CFRP) plates were measured and the results were combined with an extensive dataset drawn from the existing literature
These data were used to construct a predictive mathematical model for debonding moments. Results from this model were compared with the bending capacity of the beam with the different tensile reinforcement ratios from the experimental test results and previously proposed models
Summary
Buildings that experience deterioration in strength, damage, or changes in the design code during their service lifetime need to be strengthened or repaired to meet design code specifications. The equation proposed by Teng and Chen [22] was influenced by the theoretical ultimate moment of the unplated section, which is the upper bound of the flexural debonding moment, the flexural rigidities of the cracked section with and without an FRP plate, the elastic modulus of the FRP, the thickness and width of the FRP plate, the elastic modulus of the concrete, and the width and effective depth of the RC beam This present study examines the effect of the reinforcement ratio on the flexural behavior of RC beams with CFRP plates and proposes a model for calculating the debonding moment. The analytical results were compared with those obtained from laboratory testing
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