酸雨环境下锈蚀RC剪力墙恢复力模型研究

出于酸雨环境下锈蚀RC剪力墙结构抗震性能评估的需要，该文提出了酸雨环境下RC剪力墙宏观恢复力模型，通过对6榀锈蚀RC剪力墙拟静力试验结果进行回归分析，得到了考虑轴压比与钢筋锈蚀率影响的锈蚀RC剪力墙骨架曲线特征点荷载与位移修正系数计算公式，以循环退化速率来表征构件强度和刚度的退化，确定了基于循环耗能的循环退化指数β_i，并进一步建立了可考虑捏缩效应、屈服强度退化、峰值强度退化、卸载刚度退化及再加载刚度退化的锈蚀RC剪力墙滞回模型。与试验结果对比发现:采用该模拟方法得到的各试件的骨架曲线、滞回曲线以及试件破坏时的累积耗能均与试验结果吻合较好，表明所建立的锈蚀RC剪力墙宏观恢复力模型能较为准确的反应酸雨环境下RC剪力墙结构的力学性能及抗震性能，可为该类结构的抗震性能评估提供理论参考。

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 indexβi 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.