Abstract:Double shear test was designed to investigate interfacial shear performance of GFRP/CFRP concrete overlap joint specimens, with different interface adhesive, interface treatment, curing pressure and temperatures of epoxy resin, of which the impacts on interfacial shear performance were also analyzed. The test results show that compared with ideal physical roughening, the interface chemical roughening improves the mechanical anchorage performance, but reduces the activity of curing agent, which results in the decrease of interfacial shear strength by 29%. Compared with normal interface adhesive agent of epoxy resin, the silane coupling agent of 15% KH550 solution can be employed to improve the interfacial shear strength between interply hybrid GFRP/CFRP and concrete by 66%. With the increase of curing pressure of epoxy resin, the interfacial shear strength increases at first and then decreases, reaching extremum at about 005MPa curing pressure. At the curing temperature range of 15~45℃, the influence of the curing temperature on the interfacial shear strength is inaparent, but when the curing temperature drops below 15℃, the shear strength decreases sharply, which is irreversible even by increasing temperature.