大跨悬索桥塔梁纵向位移控制阻尼器病害分析  

Analysis of the damper diseases for controlling the longitudinal displacement between the tower and main girder of a long-span suspension bridge

作　　者：宗海[1,2] 庞振浩 茅建校 王浩[3,4] ZONG Hai;PANG Zhenhao;MAO Jianxiao;WANG Hao(School of Transportation,Southeast University,Nanjing 211189,China;Nanjing Highway Development(Group)Co.,Ltd.,Nanjing 210031,China;Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;Bridge Research Center,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学交通学院,江苏南京211189 [2]南京公路发展(集团)有限公司,江苏南京210031 [3]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京211189 [4]东南大学桥梁研究中心,江苏南京211189

出　　处：《哈尔滨工程大学学报》2022年第7期950-957,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51978155,52108274)。

摘　　要：为研究沙坝对沿岸流不稳定运动特征的影响,本文以某跨长江悬索桥为工程背景,结合现场观测与监测数据分析了该桥纵向阻尼器的病害机制及治理措施。本文描述了阻尼器发生的螺栓断裂、销轴滑出和耳板折断等病害;结合桥塔与主梁连接处的横桥向与竖向实测相对位移分析了阻尼器病害的发生原因,并据此进行了改进设计与更换;根据桥梁健康监测系统记录的塔梁纵向相对位移,对比分析了阻尼器更换前后的工作性能。结果表明:该桥塔梁连接处横桥向和竖向相对位移最大可达25 mm和60 mm;塔梁间较大的相对位移使得纵向阻尼器的两侧耳板受力不均衡,进而导致阻尼器发生销轴滑出、耳板失效等病害;阻尼器改进包括构造措施和强度措施。To examine the influence of sandbar on longshore current instability, taking a suspension bridge across Yangtze River as an engineering background, the disease mechanism and treatment measures of longitudinal damper of this bridge were analyzed in detail based on field observation and monitoring data. Firstly, the paper describes the disease of the dampers in detail, e.g., bolt fracture, pin slip-out and ear plate fracture. Afterwards, the cause of the damper disease is analyzed based on the measured transverse and vertical relative displacements between the tower and main girder. On that basis, the improvement design and replacement of the new dampers are carried out. Finally, according to the longitudinal relative displacement between the tower and main girder recorded by the bridge health monitoring system, the movement condition of the main girder before and after the damper is compared and analyzed. Results show that the maximum transverse and vertical relative displacements between the tower and main girder can reach 25 mm and 60 mm. The large relative displacement between the tower and main girder makes the stress on the two side ears of the longitudinal damper unbalanced, which leads to the diseases such as pin slip-out and ear plate failure of the damper. Improvement of damper includes structural measures and strength measures.

关 键 词：大跨度悬索桥 塔梁相对位移 纵向阻尼器 粘滞流体阻尼器 病害机理 改进优化 实测验证 维护 

分 类 号：U443.5[建筑科学—桥梁与隧道工程]