Nonlinear Numerical Simulation On The Interaction Between FRP Bars And Concrete

FRP bar is a new style composite material that possesses nicer mechanics and resistance causticity performance which can greatly improve concrete structure durability by using to instead of reinforcement steel bars. The same as the RC structures, it is the bond that makes two kinds of materials work together. The bonding performance of FRP bar and concrete is one of the basic mechanic properties of the FRP reinforced concrete structures; it also is one of the key techniques about designing and spreading this structural. On the basis of collecting the data in and out abroad, this paper makes use of the numerical simulation for the research on the interaction between concrete and FRP bars.The pullout test specimens were numerical simulated with ABAQUS program, and the simulation results were compared with the experimental results. The results show that the distribution of bond stress is nonhomogeneous along the embed length. At the beginning, the maximum bond stress occurred around the loading end. And with the increase of the load, the maximum bond stress move to the free end along the embed length.This paper analyzes the results of the numerical simulation on pullout test, finding how the main factors affected the bond performance and the bond strength, such as the embedded length, diameter of FRP bar and the strength of concrete. From the results of the numerical simulate, find that when the embedded length is in the range between la=5d and la=6d the bond strength reach to the largest, and the distribution of bond stress is much more averaging when la=5d. The results also show that the bond strength is decreased as the diameter of the bars and the embedment length increased. And the bond strength is associated with the strength of concrete; it is increased as the strength of concrete increased.Nonlinear finite element analysis of FRP reinforced concrete beams with ABAQUS program was conducted in two cases considering and not considering the bond-slip performance between FRP and concrete, and the simulation results were compared with the experimental results. From the results of the numerical simulate, it is concluded that both the simulation results of the two cases were near to the experimental results. The limit moment from the numerical simulation that is not considering the bond-slip performance between FRP and concrete is bigger than that from experiment. Because of considering the bond-slip performance the limit moment is smaller than the results not considering the bond-slip performance. It shows that this method for bond performance simulation is feasible.The distribution and development of the basic variable were analyzed according to the analysis results of the ABAQUS program. The development of the crack is similar to the steel reinforced beams. When the strength of concrete and FRP are confirmed, the failure model of the beam is different on account of the ratio of reinforcement.