高速铁路大跨径混合梁部分斜拉桥参数敏感性分析  

Parametric Sensitivity Analysis of Long-Span Hybrid Girder Extradosed Bridge Accommodating High-Speed Railway

作　　者：陈华梁 袁帅华[2] CHEN Hualiang;YUAN Shuaihua(Guangxi Railway Investment Group Co.,Ltd.,Nanning 530022,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]广西铁路投资集团有限公司,广西南宁530022 [2]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《桥梁建设》2025年第2期108-115,共8页Bridge Construction

摘　　要：为研究无砟轨道高速铁路混合梁部分斜拉桥各设计参数对其成桥状态的影响,保障无砟轨道铺设与运营期安全,以广西南玉高铁六景郁江特大桥主桥为背景,采用有限元软件建立空间分析模型模拟施工全过程,基于参数敏感性分析原理,分析主梁容重、斜拉索初张力、混凝土弹性模量及温度等设计参数对成桥状态下主梁竖向变形、主梁应力、斜拉索索力及桥塔偏位的影响,并分析各成桥状态控制目标对各设计参数的敏感性。结果表明:主梁容重与斜拉索初张力对成桥状态主梁竖向变形及斜拉索索力影响较大,对主梁应力及桥塔纵向偏位有一定影响;混凝土弹性模量对成桥状态的累计影响较小;整体升降温对不设固定支座的桥塔纵向偏位影响较大;索梁温差对主梁竖向变形、主梁应力及斜拉索索力影响较大;主梁温度梯度对主梁应力、主梁竖向变形影响较大。The main bridge of Liujing Yujiang River Bridge carrying a section of the Nanning-Yulin High-speed Railway is used as a case to study the influence of design parameters on the completed state of the hybrid girder extradosed bridge accommodating ballastless high-speed railway,aiming to ensure the safety of the bridge at the ballastless track placement stage and service stage.A spatial finite element model was developed to simulate the whole construction process.The influence of multiple design parameters on the vertical deformation of and stresses in the main girder,stay cable forces as well as pylon offsets after the completion of the bridge was analyzed,including the main girder unit weight,stay cable initial tensioning forces,elastic modulus of concrete and thermal effect.And the sensitivity responses of control targets of the completed bridge to these design parameters were analyzed.It is shown that main girder unit weight and stay cable initial tensioning forces are critical to the vertical deformation of the main girder as well as the stay cable forces of the completed bridge,rather than the main girder stresses and pylon longitudinal offsets.The elastic modulus of concrete shows minor cumulative influence on the completed bridge,while overall temperature rise and fall exerts great influence on the longitudinal offsets of the pylon with no fixed bearings.The difference of temperatures in the stay cables and pylons has remarkable influence on the vertical main girder deformation,stresses in the main girder as well as stay cable tensions.The temperature gradient of main girder exerts great influence on the stresses in and vertical geometry of main girder.

关 键 词：高速铁路桥 混合梁部分斜拉桥 主梁容重 斜拉索初张力 混凝土弹性模量 温度 敏感性分析 有限元法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U448.13[交通运输工程—道路与铁道工程]