Abstract：Emulative precast concrete structure connects the precast concrete components to form a whole by cast-in-situ concrete. The interfaces between the precast components and the local cast-in-situ concrete are often formed to be rough by various processes to ensure the bonding properties of the new and old concrete. A precast concrete component interface by the bubble film is proposed and its shear performance is studied through experiments. Double-shear specimens, considering different concrete strength grades and the connecting steel bar at the interface, were designed to compare with the cast-in-situ specimen mainly from the aspects of the bearing capacity and the ductility. The experimental and analysis results show that the shear capacity of the specimen processed by bubble film exceeds the design requirements, and can reach 71%～93% of that of the cast-in-situ specimen. Increasing concrete strength grade can improve the shear capacity. Connecting steel bars can effectively improve the shear capacity of specimens and significantly improve the ductility. Since the cast-in-situ specimens are in shear-flexure state，the effect of connecting steel bars on the shear resistance of the cast-in-situ specimens is more obvious than that of the specimens processed by bubble film. Under the basically same reinforcement ratio of the connecting steel bars, the reinforcement configuration with smaller diameter and tight spacing is recommended.
