大胜关大桥吊杆振幅的长期监测与分析  

Long-term Monitoring and Analysis of Hanger Amplitude of Dashengguan Bridge

作　　者：耿方方[1] 卞宇[2] 丁幼亮[2,3] GENG Fangfang;BIAN Yu;DING Youliang(School of Architecture Engineering,Nanjing Institute of Technology,Nanjing Jiangsu 211167,China;Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing Jiangsu 210096,China;Key Laboratory for Health Monitoring and Control of Large Structures of Hebei Province,Hebei Shijiazhuang 050043,China)

机构地区：[1]南京工程学院建筑工程学院,江苏南京211167 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [3]河北省大型结构健康诊断与控制实验室,河北石家庄050043

出　　处：《铁道建筑》2017年第11期25-28,共4页Railway Engineering

基　　金：国家重点基础研究计划(973计划)(2015CB060000);国家自然科学基金(51578138);河北省大型结构健康诊断与控制重点实验室开放课题(201502);南京工程学院校级科研基金(YKJ201513)

摘　　要：以大胜关大桥吊杆为研究对象,应用桥梁健康监测系统对高速列车通过时的吊杆振幅进行长期监测,研究不同荷载工况下吊杆振幅的长期时变规律。分析结果表明:高速列车通过时,吊杆纵向振幅响应大于横向振幅响应,吊杆纵向振幅和横向振幅长期变化曲线均呈现出明显的随机性;高速列车作用下吊杆的纵向振幅和横向振幅与列车车速、结构温度之间没有明显的相关性;采用log-logistic分布函数可以很好地描述各工况下吊杆横向振幅和纵向振幅的概率密度统计特性;通过确定各工况下吊杆振幅的分级预警阈值,可以有效评估吊杆的健康状态,为大胜关大桥的安全运营提供技术保障。Taking Dashengguan Yangtze River Bridge as the research object,the long term variation regularities of hanger amplitude under different working conditions were monitored and analyzed by applying the bridge health monitoring system when high speed trains passed through the bridge.The results indicate that when high speed trains pass through the bridge,the hanger amplitude in the transverse direction is much larger than that in the longitudinal direction.The long term variations of hanger amplitude in both the transverse direction and the longitudinal direction have obvious random characteristics.There are no significant correlations between the hanger amplitude and the speed of the trains,nor the structural temperatures.The statistical characteristics of probability density of hanger amplitude under different working conditions can be fitted by the log logistic distribution function.The health state of hanger can be effectively assessed and the technique support for the safe operation of Dashengguan Yangtze River Bridge can be provided by determining grade warning threshold of hanger amplitude.

关 键 词：铁路桥梁 桥梁健康监测系统 吊杆振幅 现场试验 钢桁拱桥 概率统计 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]