氯离子侵蚀后桥墩的抗震性能及损伤指标研究  

Aseismic performance and damage index of pier after chloride ion erosion

作　　者：周敉 张洋 姜永存 朱国强 刘阳 兰方言 吴江 ZHOU Mi;ZHANG Yang;JIANG Yongcun;ZHU Guoqiang;LIU Yang;LAN Fangyan;WU Jiang(Key Laboratory for Old Bridge Detection and Reinforcement Technology of the Ministry of Transportation,Chang’an Univrsity,Xi'an 710064,China;Henan Provincial Transportation Planning and Design Institute Co.,Ltd.,Zhengzhou 450046,China;Guangdong Communication Planning&Design Institute Co.,Ltd.,Guangzhou 510507,China)

机构地区：[1]长安大学旧桥检测与加固技术交通行业重点实验室,西安710064 [2]河南省交通规划设计研究院股份有限公司,郑州450046 [3]广东省交通规划设计研究院股份有限公司,广州510507

出　　处：《振动与冲击》2022年第15期263-272,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(51978062);国家重点研发计划(2021YFB1600300);陕西省自然科学基础研究计划-联合基金(2021JLM47);长安大学中央高校基本科研业务费专项资金(300102212209,300102210513)。

摘　　要：为研究氯离子(Cl^(-))侵蚀对钢筋、混凝土材料性能和桥墩抗震性能的影响,设计了3组6根大比例尺钢筋混凝土墩柱模型,并对各组中的待侵蚀模型试件进行了Cl^(-)电化学加速侵蚀。对各试件进行拟静力加载试验,分析Cl^(-)侵蚀前后不同墩高和不同配筋率的墩柱模型抗震性能指标的变化规律,并采用Park-Ang和M-Park两种双参数模型评价墩柱的地震损伤。研究结果表明:Cl^(-)侵蚀对混凝土和钢筋材料性能产生削弱影响;受Cl^(-)侵蚀试件的位移延性能力、承载能力、耗能能力均明显小于未受侵蚀试件;侵蚀试件的等效黏滞阻尼系数在极限位移前大于相应未受侵蚀的试件;Cl^(-)侵蚀会明显增加墩柱的地震损伤,在极限位移处增大至未侵蚀墩柱的两倍;墩柱配筋率越大时,Cl^(-)侵蚀对墩柱地震损伤的影响越大。Here,to study effects of chloride ion(Cl^(-))erosion on properties of reinforcement and concrete materials and aseismic performance of pier,3 groups of 6 large-scale reinforced concrete(RC)pier column models were designed,and Cl^(-)electrochemically accelerated erosions were conducted for model specimens to be eroded in each group.Then,quasi-static loading tests were conducted for each specimen to analyze variation laws of aseismic performance index of pier column models with different pier heights and different reinforcement ratios before and after Cl^(-)erosion,and 2 dual-parameter models of Park-Ang and M-park were used to evaluate earthquak damage of pier column.The results showed that Cl^(-)erosion has a weakening effect on properties of concrete and reinforcement materials;displacement ductility,load-bearing capacity and energy dissipation capacity of corroded specimens are significantly smaller than those of non-corroded specimens;the equivalent viscous damping coefficient of the eroded specimen is larger than that of the corresponding non-eroded specimen before reaching limit displacement;Cl^(-)erosion can obviously increase earthquak damage of pier column,it is increased to twice that of non-eroded pier column at limit displacement;the larger the reinforcement ratio of pier column,the larger the impact of Cl^(-)erosion on earthquak damage of pier column.

关 键 词：抗震性能 地震损伤 拟静力试验 桥梁墩柱 累积滞回耗能 Cl^(-)侵蚀 

分 类 号：U44[建筑科学—桥梁与隧道工程]