: Nowadays concrete structures need to be strengthened and rehabilitated for some reasons such as faults in design, changes in design codes and natural disasters. Among concrete structures strengthening methods, application of FRP composites has increased significantly. These composites have some advantages such as high tensile strength, light weight, high corrosion resistance, low costs and ease of application. The aforementioned benefits lead to superiority of using FRP composites than other strengthening methods. Externally Bonded Reinforced (EBR) is the most common technique for strengthening of structures with FRP composites. The main problem of this method is premature debonding of FRP composites from the concrete substrate. In other hand, one of the most important field of strengthening is strengthening under dynamic loads. Such as impact loads, blast loads and earthquake loads. Nowadays many investigations about bond behavior under quasi-static loading are available in literature, but there are a few investigations which have studied bond behavior under dynamic loading. One of the most important features of dynamic loading is high loading rate, (for example earthquake loading) for this reason, it is important to study bond behavior under high loading rates. To achieve this aim 36 concrete prism with dimensions of 150 150 350 mm were cast. Concrete mixture design was justify; MARGIN: 0in 0in 8pt" Keywords: FRP Composites, debonding, bond strength, dynamic loading, high loading rate, EBR method, EBROG method, single shear test, image processing, particle image velocimetry,
