城市轨道交通槽型梁力学性能分析

发布时间：2018-03-22 19:46

本文选题：槽型梁　切入点：力学性能　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：槽型梁具有建筑高度低、空间利用率高等优点,因此在城市轨道交通中得到广泛应用。槽型梁属于下承式开口薄壁结构,受力复杂,在施工过程中影响其力学性能的因素较多,为了确保槽型梁在施工过程中安全可靠,需要研究城市轨道交通所用槽型梁的力学性能。本文以城郊铁路槽型梁为研究对象,采用有限元方法,研究槽型梁在施工过程中的力学性能,为槽型梁的设计、施工及工程应用提供参考。本文主要工作如下:1.采用有限元软件ANSYS建立槽型梁精细计算模型,分析了梁高、道床板厚度、承托角隅斜率等设计参数变化对槽型梁在自重及预应力作用下力学性能的影响。结果表明:梁高及道床板厚度对其力学性能影响较大,根据计算结果提出了合理的设计参数。2.分析了竖向温度梯度、横向温度梯度及系统温差对槽型梁力学性能的影响。结果表明:竖向温度梯度对其竖向位移、纵向应力、横向应力影响较大,横向温度梯度主要引起结构纵、横向应力,系统温差对其变形影响较大。3.研究了存梁台位不等高时槽型梁力学性能。结果表明:台位高差对其横向应力影响较大,建议将存梁台位高差控制在2mm范围内。4.研究了槽型梁在运输及吊装过程中的受力性能,分析了不平衡吊装及运梁过程中3点支撑时槽型梁的内力、变形,为保证槽型梁在施工过程中的安全提供技术支撑。
[Abstract]:Slot beam has the advantages of low building height and high space utilization ratio, so it is widely used in urban rail transit. In order to ensure the safety and reliability of grooved beam during construction, it is necessary to study the mechanical properties of grooved beam used in urban rail transit. In this paper, the slot beam of suburban railway is taken as the research object, and the finite element method is adopted. The mechanical properties of slot beam during construction are studied, which provides a reference for the design, construction and engineering application of slot beam. The main work of this paper is as follows: 1. The fine calculation model of slot beam is established by using finite element software ANSYS, and the beam height is analyzed. The influence of the design parameters such as the thickness of the track bed and the slope of the supporting angle on the mechanical properties of the slotted beam under the action of deadweight and prestress. The results show that the height of the beam and the thickness of the slab have great influence on the mechanical properties of the slotted beam. According to the calculation results, the reasonable design parameters. 2. The effects of vertical temperature gradient, transverse temperature gradient and system temperature difference on the mechanical properties of the slot beam are analyzed. The results show that the vertical temperature gradient affects the vertical displacement and longitudinal stress of the beam. The transverse temperature gradient mainly causes the longitudinal and transverse stress of the structure. The mechanical properties of slot beam with different height of beam platform are studied. The results show that the lateral stress is greatly affected by the height difference of platform. It is suggested that the height difference of the storage platform should be controlled within the range of 2mm. 4. The mechanical properties of the slot beam during the transportation and hoisting are studied, and the internal force and deformation of the slot beam during the unbalanced hoisting and the 3 point support during the process of carrying beam are analyzed. It provides technical support to ensure the safety of slot beam during construction.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441

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