【作者】 张庆福；

【导师】 滕念管；

【作者基本信息】 上海交通大学 ， 结构工程， 2009， 硕士

【摘要】 磁浮轨道梁是磁浮线路的主要组成部分,是列车运行中安全性和舒适性的主要控制因素之一。本文主要研究了磁浮双跨连续轨道梁在日照大气环境下的温度变形,以及在温度变形下研究车辆通过时的动力反应。桥梁的温度变形分析结果主要取决于桥梁的温度梯度模式的选取及温度设计值,不同国家提出了不同的半经验半理论的温度梯度模式。现有箱梁结构温度效应的研究成果主要是针对公路、铁路箱梁,但本文讨论的磁浮箱梁系列,截面形式与一般的公路、铁路箱梁不同。温度变形使轨面不平顺,作为一种激励因素会加剧车桥系统的振动。因此有必要对轨道梁的温度变形以及磁浮列车通过时温度变形对桥梁振动产生的影响进行深入的研究。主要研究工作和结论如下:(1)通过建立ANSYS有限元模型,分析了不同高度的轨道梁截面系列的温度效应。研究表明,随截面高度的增加,箱梁的温度作用增大。(2)通过箱梁的温度效应,分析了连续轨道梁在温度作用下的变形。研究表明,连续轨道梁在温度作用下的变形满足要求。(3)建立了模拟上海线的车桥耦合振动模型,并编制FORTRAN90计算程序分析在温度作用下的双跨连续梁的振动特性。分析表明,目前上海线使用的轨道梁动力性能良好。本论文所建立的轨道梁温度作用分析模型、箱梁截面温度梯度模型和考虑温度变形影响的车桥振动分析方法与结论,可为相关磁浮线路设计,优化提供参考。更多还原

【Abstract】 The maglev guideway is one of the main determining factors of the traffic safety and comfort as a key component of the maglev system. The deformation of the guideway due to the atmospheric environment and the dynamic characteristics of the deformed beam while the vehicle passes are studied in this thesis.The analytical result of beam’s thermal deformation primarily depends on the selection of the thermal gradient mode and the thermal design value. Different thermal gradient modes are adopted in different countries. Nowadays, the research results of thermal effect on the box girders are mainly targeted to highways and railways, but the series of the maglev box girders are very different in the thesis. The thermal action makes the guideway producing deformation, which will aggravate vibration of vehicle-guideway system. So it is necessary to do deeply research on thermal deformation and its influence on vehicle-guideway vibration.The main conclusions of the thesis are described as follows:(1) The thermal effect on Series of guideway section with different height is analysed through building the ANSYS analytical model.Study indicates that the thermal deformation of guideway increases with the height of section.(2) The thermal deformation of the continuous guideway is analysed through the thermal effect. It shows the thermal defomation of continuous maglev guideway satisfies with the requirement.(3) The coupling vibration model simulating Shanghai maglev line is built , and the dynamical character of the double-span continuous guideway is worked out by the calculational program in FORTRAN90.Analysis indicates the dynamical character of guideway in Shanghai line is in good condition at present.The vehicle-guideway interaction model considering the influence of temperature deformation in the dissertation can be referred in the guideway design.更多还原