Debonding behavior and interfacial stress in carbon fiber-reinforced polymer plate-strengthened top flange of box-girder bridge

Abstract The interfacial stress in a carbon fiber-reinforced polymer (CFRP) plate for strengthening the top flange of box-girder bridge was theoretically investigated. According to force analysis results structure, most unfavorable area selected modeling analysis. Using simplified beam model, CFRP plate-concrete interfacial-stress calculation model derived, and closed-form solution obtained. Equivalent test specimens were designed according structure verify reliability theoretical model. Then, four-point bending tests sample performed. In these tests, debonding failure modes strain examined. calculated data experimental tests. Then compared with results. Furthermore, corresponding stresses different load levels specified code. A series comparisons performed proposed CFRP-concrete