Abstract：Based on the previous research work, the proposed dynamic constitutive model of recycled aggregate concrete(RAC) and the nonlinear finite element method are used to deeply analyze the change law of the structural restoring force behavior affected by the strain rate and replacement ratio(R) of recycled coarse aggregate(RCA), and the calculation models of characteristic parameters of the restoring force, which consider strain rate and replacement ratio of RCA comprehensively, are proposed. Through the quantitative comparison and analysis of characteristic parameters, the calculation formulas for strain rate influence factors of yield load and deformation under different replacement ratios of RCA are given. Based on the quantitative analysis of the influences of strain rate and replacement ratio of RCA on the ductility of RAC structure, the calculation formula of strain rate influence factor of displacement ductility coefficient is given. The rationality of the calculation model is verified by the prediction analysis of the model and the test results. This research work provides a theoretical basis for the study of the basic problems such as the rate sensitivity of recycled aggregate concrete(RAC), and provides technical support for the promotion, engineering application, and seismic optimal design of RAC.
