氯离子侵蚀下低矮RC剪力墙抗震性能试验研究

基于人工气候环境模拟技术，对5榀低矮RC剪力墙试件进行加速腐蚀试验，继而对其进行拟静力加载试验，研究氯离子侵蚀下锈蚀程度对低矮RC剪力墙承载能力、变形能力及剪切变形占总水平位移比等的影响规律。结果表明：在氯离子侵蚀作用下，低矮RC剪力墙沿暗柱纵筋方向的裂缝数量较暗柱箍筋和分布筋多，宽度更宽；当水平分布筋锈蚀率从0%增大到16.56%时，试件承载能力、总体变形能力、延性等方面则均有不同程度的退化，其中承载力削弱了12.6%，延性降低了23.0%，且开裂、屈服和峰值特征点下剪切变形占总水平变形比均逐渐增大，三个特征点平均剪切变形占比从22%提高到36%，破坏时剪切破坏特征愈加明显。该文所得研究成果可为氯离子侵蚀作用下锈蚀低矮RC剪力墙构件的抗震性能研究和含低矮RC剪力墙结构的全寿命周期抗震性能评估提供理论支撑。

EXPERIMENTAL STUDY ON ASEISMIC BEHAVIOR OF SQUAT RC SHEAR WALLS DUE TO CHLORIDE ION EROSION

In order to study the influence of corrosion degree on the bearing capacity, deformation capacity and ratio of shear deformation to total horizontal displacement of squat RC shear wall due to chloride ion erosion, the artificial climatic simulation technology was used to accelerate the corrosion of five squat RC shear wall specimens, and then a quasi-static loading test was carried out. The results show that under the action of chloride ion erosion, the cracks along the longitudinal reinforcement direction of the concealed column increase in quantity and become wider in width than that along the stirrups and distribution reinforcement direction. With the corrosion rate of lateral distribution reinforcement increasing from 0% to 16.56%, the bearing capacity, deformation capacity, ductility and other aspects show different degrees of degradation, of which the bearing capacity is weakened by 12.6%, the ductility is reduced by 23.0%. Simultaneously, the ratio of shear deformation to total horizontal displacement under cracking, yielding and peak points all show a growing trend, the average ratio of the three points is increased from 22% to 36%, and the brittle failure characteristics are more obvious at the time of failure. The research results obtained can provide a theoretical support for both the aseismic performance study of corroded squat RC shear wall members due to chloride ion erosion and the life-cycle aseismic performance evaluation of RC structures with squat shear walls.