Abstract:To research the fatigue performance of the NSM CFRP-concrete interface, 5 NSM CFRP-concrete specimens were designed. The simple shear pull-out test was conducted to analyze the influence of the load amplitude and bond length on the interface strain distribution, interface hysteresis performance, and interface dissipation energy. The results show that the interface debonding progress of the specimens, which reached to the designing fatigue cycle, is characterized by the high-speed load transmission period and the stable load transmission period. However, for other specimens, the interface debonding possesses the complete high-speed load transmission period, the stable load transmission period and the unstable load transmission period. The fatigue hysteresis performance, at the position 14 comfrom the load end, shows the similar situation of the slip-stress compared with the static experiment. For the measuring point with the same fatigue loading times, the interfacial damage level and the maximum value of the interfacial dissipation energy increase, when the load amplitude increases from 32% to 40%. the interfacial damage level decreases, the maximum value of the interfacial dissipation energy increases, when the bond length of the specimens increases from 200 mm to 280 mm.