高速铁路大跨钢结构桥梁10年动力特性变化分析  

Research on 10-Year Dynamic Property Variation of Long-Span Steel High-Speed Railway Bridge

作　　者：赵健业 周筱航 李艳哲[5] ZHAO Jianye;ZHOU Xiaohang;LI Yanzhe(China Academy of Railway Sciences,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory for Track System of High-speed Railway,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;China Railway Major Bridge Engineering Group Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]中国铁道科学研究院,北京100081 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]中国铁道科学研究院集团有限公司高速铁路轨道系统全国重点实验室,北京100081 [4]广西大学土木建筑工程学院,广西南宁530004 [5]中铁大桥局集团有限公司,湖北武汉430050

出　　处：《桥梁建设》2025年第2期86-93,共8页Bridge Construction

基　　金：广西重点研发计划项目(桂科AB22036007)。

摘　　要：为探究高速铁路大跨钢结构桥梁长期服役性能演化规律,以郑新黄河大桥为背景,采用动态测试的方法进行研究。对该桥在试验车及过路车激励下相隔10年(2012—2022年)的主梁横向及竖向振幅、竖向加速度、杆件应变、桥梁模态参数及端横梁动挠度进行对比分析,并对数据的相关性及离散性展开研究。结果表明:在试验车及过路车的激励下,2022年主梁横向及竖向振幅、竖向加速度、杆件应变较2012年测试数据普遍增大,且总体存在边跨变化量大而中跨变化量小的现象;大桥自振频率在10年间变化很小,端横梁动挠度略微增大,但总体数值均很小,表明大桥具有较好的刚度和轨道平顺性;主梁动力响应随列车速度的提高而增加,主梁杆件应变与车速具有较强的关联性;2022年各孔跨间动力测试数据相关性普遍大于2012年,离散性符合要求。可将主梁横向及竖向振幅、竖向加速度及杆件应变幅值、桥梁模态参数、端横梁动挠度以及相关性作为状态评估指标,将离散性作为数据可靠性评判指标,用以评估高速铁路钢结构桥梁的长期运营状态。This paper investigates the long-term service performance changes of the long-span steel high-speed railway bridge.A dynamic testing method is used.The 10-year monitoring data(2012-2022)of the Zhengxin Huanghe River Bridge were compared and analyzed,including the transverse and vertical vibration amplitudes of the main girder,the vertical acceleration of the main girder,strains of truss members,bridge modal parameters,and dynamic deflections of end crossbeams under the excitation of test trains and regular passing trains.The correlation and discreteness of these data were discussed.The analysis results demonstrate that the values of the transverse and vertical vibration amplitudes of the main girder,the vertical acceleration of the main girder,strains of truss members are bigger than those measured in 2012,and the changes of the data of the side spans are generally greater than those of the main span.The natural frequencies of the main girder showed minimal change over the 10-year period,the deflections of end crossbeams are slightly increased,but the overall values are small,indicating that the bridge has sound stiffness and track regularity.The dynamic responses of the main girder are in linear relation with the train speed,and the strains of truss members are highly correlated with the train speed.The correlation of dynamic testing data in 2022 is stronger than those in 2012,and the discreteness of data meets the requirements.It is suggested that the data of the transverse and vertical vibration amplitudes of the main girder,the vertical acceleration of the main girder,strains of truss members,bridge modal parameters,and dynamic deflections of end crossbeams as well as the data correlation be used as bridge condition evaluation indexes,and the discreteness as the data reliability evaluation index,to evaluate the long-term service performance of the steel high-speed railway bridge.

关 键 词：铁路桥 动力特性 运营状态 相关性 离散性 评价指标 动态测试 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U446.3[交通运输工程—道路与铁道工程]