A RESTORING FORCE MODEL OF RC SHEAR WALLS IN A SIMULATED ACID ENVIRONMENT

A macroscopic restoring force model of corroded RC shear walls was proposed to evaluate the seismic performance of corroded RC shear walls under acid rain. The load and displacement correction factor formula of critical points on the corroded RC shear wall skeleton curve was developed. The formula was obtained by applying the regression analysis of test data on six corroded RC shear walls, considering the influence of the axial compression ratio and steel corrosion rate. The degradation of the strength and stiffness of the specimens were characterized by a cyclic degradation index βi based on cycle energy consumption. The corroded RC shear wall hysteresis model was established considering the pinching effect, yield strength degradation, peak strength degradation, unloading stiffness degradation and reloading stiffness degradation. By comparing the simulation results with the experimental data, it can be found that all the skeleton curves, the hysteresis curve and the energy dissipation of the specimens obtained by the proposed method were in good agreement with the experimental data. Consequently, the macroscopic restoring force model for corroded RC shear walls established in this study can accurately reflect the mechanical and seismic performance of corroded RC shear walls, indicating its adaptiveness for estimating the seismic performance of corroded RC shear wall structure under acid rain.