大跨曲线连续梁桥与轨道相互作用

发布时间：2018-01-12 18:21

本文关键词：大跨曲线连续梁桥与轨道相互作用　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：高速铁路大跨度曲线连续梁桥可较好的适应地形、水利、交通等条件,在高速铁路中应用日益广泛,梁轨间相互作用成为大跨度曲线桥梁与无缝线路设计及安全使用的重要控制因素之一。本文针对高速铁路线上的大跨度曲线连续梁桥,对有砟轨道与桥梁相互作用进行了系统的研究, 主要内容如下：(1)以高速铁路48m+7×80m+48m长联大跨度双线有砟轨道曲线连续梁桥为工程背景,建立了钢轨-扣件-轨枕-道砟-梁体-墩台的一体化空间有限元模型,模拟了线路的纵、横向阻力及竖向刚度,更准确地反映轨道、轨枕、桥面、桥墩等各组成间的关系。(2)研究了桥上有砟轨道在列车制动、温度和竖向活载作用下的受力和变形规律,探讨了高速铁路曲线连续梁桥伸缩附加力、挠曲附加力及制动附加力的大小及分布规律。(3)针对大跨曲线连续梁桥的计算,结果表明设置小阻力扣件和钢轨伸缩调节器组合布置方案是必须的,且可以很大程度上减小钢轨中的受力。此外探讨了墩柱与梁间纵向刚度、制动墩位置以及墩柱与梁间约束条件的改进方法,提出了制动跨度的概念,结果表明改变墩柱与梁间的约束可以达到降低钢轨应力的目的。
[Abstract]:Abstract: High-speed railway long-span curved continuous beam bridge can adapt to terrain, water conservancy, traffic and so on. In high speed railway, the interaction between beam and rail becomes a kind of curve bridge with long span One of the important control factors for the design and safe use of the seamless track. The interaction between the ballasted track and the bridge is studied systematically. The main contents are as follows: 1) the curve of double-track ballasted track with a span of 48m 7 脳 80m 48m is connected to the high-speed railway. In the engineering background of continuous beam bridge, the integrated space of rail, fastener, sleeper, ballast, beam body and pier platform is established. The finite element model is used to simulate the longitudinal, transverse resistance and vertical stiffness of the track to reflect the track more accurately. The relationship among the components of sleepers, deck, piers, etc. (2) the study of the bearing of ballasted track on the bridge under the action of train braking, temperature and vertical live load The law of force and deformation is discussed in this paper. The extension and additional force of curved continuous beam bridge on high speed railway, flexural additional force and flexural additional force are discussed. The size and distribution of braking additional force (3) for the calculation of long-span curved continuous beam bridge, the result shows that the small resistance fastener and steel are set up. The combined arrangement of rail expansion regulator is necessary, and it can greatly reduce the load of rail. In addition, the longitudinal stiffness between the pier and the beam, the position of the brake pier and the restraint strip between the pier and the beam are discussed. The concept of braking span is put forward, and the result shows that the constraint between pier column and beam is changed. The purpose of reducing rail stress can be achieved.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U211

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