Abstract
Abstract This paper deals with reinforced concrete beams strengthened by CFRP in flexure. The debonding between CFRP and the surface of the beam is the main problem. Many researchers around the world have made extensive efforts to study the phenomenon of debonding for efficient applications. Based on these efforts and different related field applications, code previsions and various models have been proposed for predicting debonding failure. Two code previsions and three typical models are presented in the current study. ACI-440.2R 17, CNR-DT 200 R1/2013, Said and Wu, Lu et al., and Teng et al. have been used to estimate the flexural strength of RC beams strengthened by CFRP with and without grooves. Test results of eleven flexural beams strengthened by CFRP sheet/laminate using externally bonded reinforcement (EBR) and externally bonded reinforcement on grooves (EBROG) methods were used in the current paper. The performance and accuracy of each model were evaluated based on these test results. Most of the prediction models that used in this study give a closer prediction of the flexural strength of beams strengthened by EBR compared to that of the beams strengthened by EBROG. Finally, the prediction results of CNR-DT 200 R1/2013 were the most accurate and approval with test results compared with other models in the current study
Highlights
During the past three decades, fiber-reinforced polymer (FRP) has been an increasing interest for using in the strengthening and retrofitting of structural elements
The prediction results that obtained based on the models of Teng et al, and Lu et al have underestimated results for reinforced concrete (RC) beams strengthened by Carbon fiber reinforced polymer (CFRP) sheet / laminate and more agreement with those of experimental results compared with ACI and Said models
Analytical results were presented in order to evaluate the effectiveness and accuracy of the equations used to analysis of RC beams strengthened with CFRP sheets/laminates using the groove method
Summary
During the past three decades, fiber-reinforced polymer (FRP) has been an increasing interest for using in the strengthening and retrofitting of structural elements. Z., et al [10] presented a finite-element (FE) analysis and proposed strength model to investigate the effectiveness and accuracy of theoretical equations to predict the Intermediate crack debonding of beams strengthened by FRP. Both of FE model and simple strength equations are shown to be accurate during comparisons with test results of 42 and 77 beams, respectively. The aim of this study is to assess the accuracy of the theoretical models to predict the flexural strength of RC beams strengthened by CFRP sheet/laminate using EBR and EBROG methods. The moment capacity equations recommended by the ACI 440.2R-17 [15] and other theoretical models were used to verify the margin of safety provided by the discussed code and to verify its accuracy
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