Full-range Analysis Of Corroded Reinforced Concrete Flexural Members Under Low Cyclic Loadings

The durability damage of reinforced concrete would significantly affect the seismic performance of structures. However, current research about the seismic performance of RC members is mainly focus on the factor of concrete corrosion or earthquake action, there are few researches about both of the factors. This thesis is based on an NCFS project named "Research on the durability and seismic performance of RC structures", and analyzes the influence on seismic performance by different durability damages by simulating the nonlinear behavior of corroded RC flexural members under low cyclic loadings by ABAQUS.The main work of this thesis is as follows:1, The constitutive relationship of damaged concrete and reinforcement was established by summarizing the existing research.2, Simulated the corroded RC flexural members by ABAQUS, selected proper element type, mesh method and iteration method. Then modeled the performance of the members under one-way loadings and low cyclic loadings, to verify the chosen constitutive relationship and simulation method.3, Analyzed the influence of corrosion parameters, e.g. corrosion rate of the longitudinal reinforcement and concrete carbonation depth, on the seismic performance of RC flexural members. The results show that bearing capacity, ductility and energy dissipation capacity decreased significantly when the longitudinal reinforcement is corroded. The bearing capacity changed little after carbonation, while the ductility and energy dissipation capacity decline a little.4, By analyzing the simulation results of the corroded flexural RC members, established the restoring force model of them, which accurately reflects the relationship of the corrosion rate and the restoring force model parameters.