Abstract: The finite element model of the corroded reinforced concrete (RC) bridge pier was established and verified by combining OpenSees software with the existing experimental data. Based on this, the effects of different corrosion positions and non-orthogonal loading angles on the seismic performance of RC piers were investigated through quasi-static loading and dynamic time-history analysis. The results show that the seismic performance degrades significantly when the corrosion position is close to the plastic hinge area at the bottom of the pier, and the deterioration of the performance decreases rapidly after the corrosion position moves up. Under quasi-static action, with the loading angle tending to strong axis, the yield load and maximum lateral load of RC piers increase obviously; the ductility increases and the hysteretic energy dissipation capacity enhances significantly. On the contrary, when the loading angle is closer to the weak axis, the maximum lateral load and displacement ductility coefficient are obviously affected by corrosion and the degradation is even more severe. Under the action of ground motion, when corrosion occurs at the bottom of the pier, the maximum displacement angle at the top of the pier is the largest and the maximum shear force and bending moment at the bottom of the pier are the smallest. With the moving up of corrosion position, the maximum displacement angle decreases and the bending and shear strength increases. When the input angle of ground motion deviates from the weak axis to the strong axis, the maximum displacement angle at the top of the pier decreases, the maximum shear force and bending moment at the bottom of the pier increases, and the increase of the bending strength is larger than that of the shear strength. The research results can provide a theoretical basis for the seismic performance evaluation of corroded RC piers in service.

Key words: bridge engineering; seismic performance; rectangular bridge pier; corrosion location; loading angle; OpenSees

摘要： 针对锈蚀钢筋混凝土（RC）桥墩，采用OpenSees软件结合已有实验数据，建立其有限元数值模型并加以检验，据此通过拟静力加载和动力时程分析，探究不同锈蚀位置和非正交加载角度对其抗震性能的影响，结果发现：锈蚀位置靠近墩底塑性铰区域，抗震性能退化显著；锈蚀位置上移后抗震性能退化迅速减弱；拟静力作用下，随着加载角度趋向强轴，RC桥墩的屈服荷载和最大侧向荷载明显提高，延性增大，滞回耗能能力显著增强。反之，加载角度偏近弱轴，最大侧向荷载和位移延性系数则受锈蚀影响明显，退化加剧；地震动作用下，墩底位置发生锈蚀时，墩顶最大位移角最大，墩底最大剪力和弯矩最小，随锈蚀位置上升，最大位移角减小，抗弯和抗剪强度提升；地震动输入角度由弱轴偏向强轴时，墩顶最大位移角减小，墩底最大剪力和弯矩增大，其中抗弯强度的提升幅度比抗剪强度大。研究结果可对在役锈蚀RC桥墩的抗震性能评估提供理论依据。

关键词: 桥梁工程；抗震性能；矩形桥墩；锈蚀位置；加载角度；OpenSees