大跨度铁路桥梁整体变形波长特征分析  

Analysis on Wavelength Characteristics of Global Deformation of Long⁃span Railway Bridges

作　　者：赵健业 胡所亭[1] 郭辉 张楠[4] 苏朋飞 廖晓璇 ZHAO Jianye;HU Suoting;GUO Hui;ZHANG Nan;SU Pengfei;LIAO Xiaoxuan(China Academy of Railway Sciences,Beijing 100081,China;Railway Engineering Research Institute,CARS,Beijing 100081,China;National Key Laboratoryof High-speed Railway Track System,CARS,Beijing 100081,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,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]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道建筑》2024年第2期6-12,共7页Railway Engineering

基　　金：国家重点研发计划(2022YFB2602900);中国国家铁路集团有限公司科技研究开发计划(K2021G020);中国铁道科学研究院集团有限公司基金(2021YJ084)。

摘　　要：针对三座大跨度桥(A桥和C桥为悬索桥、B桥为斜拉桥)分别建立有限元模型,分析在温度、沉降、风、列车等作用下的桥面整体变形波长特征,并采用HHT(Hilbert‐Huang Transform)法、中点弦测法和曲率半径法定量分析桥面变形波长。结果表明:A桥在整体升降温作用下,产生的变形曲线为波长82~140 m、波幅不超过5.5 mm的曲线段;在静风荷载作用下,产生的变形曲线为波长97~140 m、波幅不超过5.4 mm的曲线段;桥塔沉降作用下A桥不产生显著变形曲线。上述三种荷载作用下B桥均不产生显著变形曲线。C桥在整体升降温作用下,产生的变形曲线为波长70~84 m、波幅不超过2.2 mm的曲线段;桥塔沉降和静风力作用下C桥均不产生显著变形曲线。列车全局荷载对三座桥的桥面变形产生影响,若关注幅值3 mm及以上的曲线段,A桥、B桥、C桥最短波长依次为66、93、53 m。就此三座桥梁而言,荷载引起的桥面垂向变形对行车性能影响的显著程度均依次为列车全局荷载、整体升温、桥塔沉降。In this paper,the overall deformation wavelength characteristics of A,B and C bridges under the effect of temperature,settlement,wind and trains were analyzed,and the deformation wavelengths of the bridge deck were quantitatively analyzed by HHT(Hilbert-Huang Transform)method,midpoint chord measurement method and radius of curvature method.The calculation results show that the curves with wavelengths 82~140 m and amplitude no more than 5.5 mm are generated under the effect of overall rising and cooling of bridge A.Under static wind loads,the curves with wavelengths 97~140 m and amplitude no more than 5.4 mm are generated.The tower settlement doesn’t produce significant deformation curves for A bridge.The above three kinds of loads doesn’t produce significant deformation curves for B bridge.Under the effects of overall rising and cooling,C bridge generated curves with the wavelengths of 70~84 m and the amplitude of no more than 2.2 mm.There are no significant deformation curves of bridge C due to tower settlement and static winds force.The global train loads have impacts on the deck deformations of the three bridges.If the curves with the amplitude of 3 mm and above were concerned,the shortest wavelengths of bridge A,bridge B and bridge C are 66,93 and 53 m respectively.For these three bridges,the significant degree of impacts of load-induced vertical deck deformations on running performance are the global train load,the overall temperature rise,and the settlement of the bridge tower.

关 键 词：大跨度铁路桥 波长特征 垂向变形 横向变形 温度 沉降 风荷载 

分 类 号：U238[交通运输工程—道路与铁道工程] U448.13[建筑科学—桥梁与隧道工程]