千米级跨度铁路桥梁梁端变位特征对比研究  

Comparison of Displacement Characteristics at Girder End of Kilometer⁃span Railway Bridges

作　　者：严乃杰 杨文博 陈宁[3] 郭辉 苏永华 刘万里 YAN Naijie;YANG Wenbo;CHEN Ning;GUO Hui;SU Yonghua;LIU Wanli(Railway Engineering Research Institute,CARS,Beijing 100081,China;State Key Laboratory for Track System of High-speed Railway,Beijing 100081,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,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集团有限公司铁道建筑研究所,北京100081 [2]高速铁路轨道系统全国重点实验室,北京100081 [3]湖南科技大学土木工程学院,湖南湘潭411201 [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12期69-75,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(J2022G004);中国铁路上海局集团有限公司(2022154)。

摘　　要：以千米级跨度铁路斜拉桥、悬索桥为研究对象,通过数值计算,分析了不同外荷载作用下两类桥梁的梁端变位特征及主要影响因素。结果表明:千米级斜拉桥、悬索桥梁端纵向位移受各类外荷载的影响均比较显著,横向位移、竖向位移及梁端转角的影响因素存在差异;不同荷载作用下千米级斜拉桥的纵向位移均显著大于悬索桥、梁端转角基本均小于悬索桥,表明斜拉桥整体纵向刚度小于悬索桥扭转刚度、竖向刚度和横向刚度大于悬索桥;千米级斜拉桥的梁变位更加复杂,运营过程中应注重斜拉桥梁端区域结构的维护。Taking the kilometer-span cable-stayed railway bridge and suspension railway bridge as the research object,the displacement characteristics and influencing factors at girder end of these railway bridges are analyzed.The results show that the longitudinal displacements at girder end of kilometer-span cable-stayed railway bridge and suspension railway bridge are significantly affected by all kinds of external loads,and the influencing factors of transverse displacement,vertical displacement and rotation angle are different.The longitudinal displacement of kilometer-span cable-stayed bridges is significantly greater than that of suspension bridges,and its rotation angle is smaller than that of suspension bridges,which indicates that the longitudinal stiffness of cable-stayed bridges is almost all smaller than that of suspension bridges,and the torsional stiffness,vertical stiffness and lateral stiffness are larger than almost all that of suspension bridges.The displacement characteristics at girder end of kilometer-span cable-stayed bridge are more complex,thus the maintenance of its girder end structure should be paid attention in operation and maintenance period.

关 键 词：铁路桥梁 梁端变位特征 数值计算 梁端结构 千米级跨度 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]