单侧锈蚀钢筋混凝土柱抗震性能试验研究  

Test study on seismic behavior of single-sided corroded RC columns

作　　者：刘小娟[1,2] 黄哲烜 刘阳 郭子雄[1,2] 蒋欢军 陈玉洁[2] LIU Xiaojuan;HUANG Zhexuan;LIU Yang;GUO Zixiong;JIANG Huanjun;CHEN Yujie(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;Key Laboratory for Structure Engineering and Disaster Prevention of Fujian Province,Xiamen 361021,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]福建省结构工程与防灾重点实验室,福建厦门361021 [3]同济大学土木工程防灾减灾全国重点实验室,上海200092

出　　处：《振动与冲击》2025年第5期197-206,277,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金(51808236,51978526);福建省自然科学基金(2021J01282);泉州市科技计划项目(2024NS013)。

摘　　要：受外界环境的影响,同一个钢筋混凝土(reinforced concrete,RC)柱中不同部位钢筋锈蚀率往往不一致,在弯曲受拉侧和受压侧的纵向钢筋锈蚀对RC柱压弯性能的影响机理也不同。为研究纵向钢筋锈蚀对RC柱抗震性能的影响规律,进行了一个未锈蚀RC柱和五个锈蚀RC柱的拟静力加载试验,分析了钢筋锈蚀率、锈蚀位置和轴压比等参数对RC柱抗震性能的影响。研究结果表明,单侧锈蚀RC柱的损伤分布和力学性能存在一定的不对称性。当轴压比为0.1时,锈蚀侧纵筋受拉断裂是导致RC柱力学性能退化的主要原因。当轴压比较大时,锈蚀侧混凝土的受压损伤和锈蚀纵筋受压屈曲是引起RC柱力学性能退化的主要原因。与未锈蚀RC柱相比,纵筋锈蚀率不超过15.00%的单侧纵筋锈蚀RC柱正向承载力降幅不超过10.00%,反向承载力降幅不超过5.00%,在极限状态时的累积耗能降幅约6.48%~15.21%。与承载力和耗能能力相比,钢筋锈蚀对RC柱变形能力的影响最显著。随着钢筋锈蚀率的增大,RC柱的弯曲变形占比减小,剪切变形和滑移变形占比增大。当受拉侧钢筋因锈蚀而提前断裂时,RC柱正向极限变形降低约30.00%~37.00%,反向极限变形降低约10.00%~17.00%。进行锈蚀RC柱抗震性能评估时,需合理考虑受拉和受压纵筋锈蚀的不均匀性。Due to effects of external environment,corrosion ratios of steel bars in different parts of the same reinforced concrete(RC)column are often inconsistent,and influence mechanisms of corrosions of longitudinal steel bars at bending tension side and bending compression side on compressive-bending performance of RC column are also different.Here,to investigate effects of longitudinal steel bars corrosion on seismic behavior of RC columns,quasi-static loading tests were conducted for 1 uncorroded RC column and 5 corroded RC columns to analyze effects of parameters of steel bar corrosion ratio,corrosion location and axial compression ratio on seismic behavior of RC columns.The study results showed that there is a certain asymmetry in damage distribution and mechanical properties of single-sided corroded RC columns;when axial compression ratio is 0.1,tensile fracture of longitudinal bars at corroded side is the main reason of degradation of mechanical properties of RC columns;when axial compression ratio is larger,compressive damage of concrete at corroded side and buckling of corroded longitudinal bars under compression are main reasons for degradation of mechanical properties of RC columns;compared with non-corroded RC column,single-sided corroded RC columns with longitudinal barcorrosion ratio not exceeding 15.00%have decrease in forward load-bearing capacity of no more than 10.00%and decrease in reverse load-bearing capacity of no more than 5.00%,cumulative energy dissipation at ultimate state reduces by about 6.48%-15.21%;compared to load-bearing capacity and energy dissipation capacity,effects of steel bars corrosion on deformation capacity of RC columns is the most significant;with increase in corrosion ratio of steel bars,proportion of bending deformation in RC columns decreases,while proportions of shear deformation and slip deformation increase;when steel bars at tensile side fracture prematurely due to corrosion,forward ultimate deformation of RC column decreases by about 30.00%-37.00%,and its reverse ultima

关 键 词：锈蚀钢筋混凝土(RC)柱 抗震性能 单侧钢筋锈蚀 锈蚀率 轴压比 

分 类 号：TU375.3[建筑科学—结构工程]