Numerical Simulation of Bonding Performance Between FRP Bars and Full Coral Aggregate Seawater Concrete

Good interfacial bonding performance is one of the important factors to ensure that FRP reinforced coral aggregate seawater concrete structure can work together and give full play to their excellent performance.Therefore, the interfacial bonding properties between the two under various influence conditions were studied by pull-out test.Based on the experimental study, a simplified bilinear model was used to establish the bond-slip model of FRP bars and coral aggregate seawater concrete by Abaqus finite element software.The effects of the diameter of FRP bar, bond length, coral aggregate seawater concrete strength and FRP bar type on bonding performance were studied.By comparing the theoretical value obtained by numerical simulation with the experimental value, it is found that the two are in good agreement.Therefore, the simplified bilinear model is applicable to analyze the interfacial bonding performance of FRP reinforced all coral aggregate seawater concrete structure.After studying the influence of various factors, it is found that increasing the interfacial bond length, the diameter of reinforcement and the strength of coral aggregate seawater concrete can improve the bond strength of the structure, but the large diameter of reinforcement is easy to cause the splitting failure of the specimen, and the enhancement effect of high strength concrete on the bond strength is not obvious.