千米级高速铁路悬索桥静力特性分析  

Static characteristic analysis of high-speed railway suspension bridge with kilometer span

作　　者：肖鑫 郭辉 苏朋飞 冯传宝 XIAO Xin;GUO Hui;SU Pengfei;FENG Chuanbao(College of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China;Railway Engineering Research Institute,China Academy of Railway Science Co.,Ltd.,Beijing 100081,China;State Key Laboratory of High Speed Railway Track Technology,Beijing 100081,China;Sichuan-Tibet Railway Technology Innovation Center Co.,Ltd.,Chengdu 610000,China;Construction Headquarters of Nanjing Railway Terminal Project,Chinese Shanghai Railway Bureau Group Co.,Ltd.,Nanjing 210042,China)

机构地区：[1]南昌航空大学土木建筑学院,江西南昌330063 [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]高速铁路轨道技术国家重点实验室,北京100081 [4]川藏铁路技术创新中心有限公司,四川成都610000 [5]中国铁路上海局集团有限公司南京铁路枢纽工程建设指挥部,江苏南京210042

出　　处：《铁道科学与工程学报》2023年第9期3229-3241,共13页Journal of Railway Science and Engineering

基　　金：国家自然科学基金高铁联合基金重点支持项目(U193420108)。

摘　　要：为了准确掌握千米级高速铁路悬索桥在静力荷载作用下的受力特征,结合现场试验和有限元模型,以主跨1092 m的五峰山长江大桥为工程背景,研究特大跨径钢桁梁悬索桥在静力荷载作用下的结构力学行为,揭示不同加载工况下钢桁梁及主塔应力,主缆索股力,桥梁挠度,梁端转角,主塔、支座以及梁端纵向位移,吊索索力的变化特征,综合分析悬索桥的静力特性。研究结果表明:在不同加载工况下,上下游弦杆受力均匀,上下游斜杆受力变化较大;主塔塔柱受力变化较小,实测值与理论值之比在0.70~0.94之间;主缆各索股受力均匀,上下游侧索股应力变化一致,主缆整体受力性能良好;桥梁跨中实测挠跨比为1/530,小于设计挠度比1/487,梁端实测最大转角为0.56‰rad,桥梁竖向刚度较大,满足相关要求;支座纵向位移变化均匀,但受运营初期支座纵向摩阻力及阻尼器的影响,导致荷载较大时,纵向位移变化缓慢,使得理论值大于实测值,梁端位移与支座位移变化一致,桥梁纵向位移变化均匀;主塔塔顶纵向位移、吊索索力变化均匀,实测值与理论值吻合较好。研究成果不仅可为同类型桥梁设计提供借鉴,也可为桥梁后期运维提供“指纹”信息。In order to accurately grasp the mechanical characteristics of high-speed railway suspension bridge under static load,combined with field test and finite element model,taking Wufengshan Yangtze River Bridge with a span of 1092 m as the engineering background,the structural mechanical behavior of super-long-span steel truss girder suspension bridge under static load was studied.The variation characteristics of steel truss girder and main tower stress,main cable strand force,bridge deflection,beam end rotation angle,main tower,bearing and beam end longitudinal displacement,sling cable force under different loading conditions were revealed.The static characteristics of suspension bridge were comprehensively analyzed.The results show that under different loading conditions,the forces on the upstream and downstream chords are uniform.The forces on the upstream and downstream inclined rods change greatly.The force change of the main tower is small,and the ratio of the measured value to the theoretical value is between 0.70 and 0.94.The stress of each strand of the main cable is uniform.The stress changes of the upstream and downstream side strands are consistent.The overall mechanical performance of the main cable is good.The measured deflection-span ratio of the bridge is 1/530,which is less than the design deflection ratio 1/487.The measured maximum rotation angle at the beam end is 0.56‰rad.The vertical stiffness of the bridge is large and meets the relevant requirements.The longitudinal displacement of the bearing changes evenly,but it is affected by the longitudinal friction resistance of the bearing and the damper at the initial stage of operation.When the load is large,the longitudinal displacement changes slowly,so that the theoretical value is greater than the measured value.The displacement of the beam end is consistent with the displacement of the bearing,and the longitudinal displacement of the bridge changes evenly.The longitudinal displacement of the main tower top and sling force change evenly,and the

关 键 词：铁路桥梁 高速铁路悬索桥 静载试验 有限元分析 静力特性 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]