摘要
为研究混凝土斜拉桥在高速铁路上的适应性,以主跨260 m高速铁路双塔混凝土斜拉桥为例,根据功能需要和场地条件进行桥梁结构设计,然后通过建立空间三维有限元模型,综合采用最小弯曲能量法和影响矩阵法确定斜拉桥的合理成桥状态。在合理成桥状态下,斜拉索索力均匀,桥梁整体处于桥塔预偏、中跨预拱状态。最后,分析混凝土加劲梁的竖向、横向刚度以及桥塔变形,研究温度作用和混凝土收缩徐变效应对行车安全性和舒适性的影响,并对混凝土加劲梁、桥塔以及斜拉索的强度进行验算。分析结果表明,大跨度混凝土斜拉桥各受力构件的强度和刚度均满足高速铁路行车要求。
The concrete cable-stayed bridge has the characteristics of low cost,high rigidity and good wind resistance stability.It has been widely used in highway bridges,but it is rarely used in railway bridges,especially in high-speed railway trunk bridges.Therefore,it is necessary to carry out in-depth research on the adaptability of concrete cable-stayed bridges on high-speed railways.Taking the double-tower concrete cable-stayed bridge with a main span of 260m for high-speed railway as an example,the bridge structure design was carried out according to the functional needs and site conditions.Then,by establishing the spatial three-dimensional finite element model,the reasonable finished dead state of the cable-stayed bridge was determined by the minimum bending energy method and the influence matrix method.In which state,the cable tensions were uniform,and the bridge was in the pylon pre-bias state and the mid-span pre-arch state as a whole.Finally,the vertical and lateral stiffness of the concrete stiffening beam and the deformation of the pylon were analyzed,and the effects of temperature and concrete shrinkage and creep on the safety and comfort of the vehicle were studied.The strength of concrete stiffening beams,pylons and stay cables was also checked.The analysis results show that the strength and stiffness of the members of the long-span concrete cable-stayed bridge meet the requirements of high-speed railway driving.
作者
龚俊虎
GONG Junhu(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;China Railway Maglev Tansportaion Investment and Construction Co.Ltd,Wuhan 430060,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2020年第7期1611-1619,共9页
Journal of Railway Science and Engineering
基金
浙江省交通运输厅科研计划资助项目(2017002)。
关键词
高速铁路
斜拉桥
混凝土梁
结构设计
受力性能
合理成桥状态
最小弯曲能量法
收缩徐变
high-speed railway
cable-stayed bridge
concrete beam
structural design
force performance
reasonable finished dead state
minimum bending energy method
shrinkage and creep
