列车荷载作用下桥梁动力响应分析

发布时间：2018-01-17 16:01

本文关键词：列车荷载作用下桥梁动力响应分析　出处：《湘潭大学》2014年硕士论文　论文类型：学位论文

【摘要】：列车行驶在桥梁上，桥梁由于受到冲击作用而发生振动，，运行的车辆随着桥梁的振动对其运行安全性和和平稳性产生重要的影响。对于车桥耦合系统来说，其荷载是移动的列车，其加载频率随着列车速率的变化而改变。从而有可能引起车桥耦合系统的共振，使桥梁或者车辆的振动增大。因此，研究车桥耦合系统的共振具有非常重要的理论和工程意义。本文在前人对车桥系统研究的基础上，主要从以下几个方面对列车桥梁耦合系统共振进行研究分析。一、建立以车体，转向架和轮对以及弹簧-阻尼器悬挂装置组成的23个自由度车辆模型，桥梁模型采用Euler梁模型，离散成三维空间的有限元模型，考虑轮轨接触力，通过采用模态综合法进行单元离散，利用子结构边界条件，对其进行坐标变换，建立车桥耦合振动方程。二、整个随机过程通过利用轨道不平顺作为主要激励源，采用对一段较长的时域样本来进行模拟替代，并将模拟的时域样本作为输入到车桥系统，通过逐步积分法后，以MATLAB为主要编译软件进行程序编写，进行数值计算并获得系统响应的时间历程。基于有限元分析软件ANSYS强大的前后处理器，对简支梁进行模态分析，并与数值计算前几阶振型保持一致。三、通过对引起车桥共振影响的因素，车辆速度，桥梁跨度，跨数，不平顺作用等进行时程响应图的比较分析，提出了车桥耦合过程中，随着车速，桥跨等因素发生改变时，对引起车桥共振的影响，可以为车辆过桥限速，或者桥梁跨度结构等方面提供理论分析支持。四、本文重点对列车-桥梁耦合系统，采用有限元软件ANSYS进行模拟分析，通过对列车加载频率影响进行对比分析，与前人研究理论相比较，最后提出一些有益的建议，对实际工程中，列车运行安全性和平稳性有重要的意义。
[Abstract]:When the train travels on the bridge, the bridge vibrates because of the impact, and the running vehicle has an important influence on the safety and stability of the bridge with the vibration of the bridge, for the vehicle-bridge coupling system. The load is a moving train, and its loading frequency changes with the change of train speed, which may cause the resonance of vehicle-bridge coupling system and increase the vibration of bridge or vehicle. It is of great theoretical and engineering significance to study the resonance of vehicle-bridge coupling system. On the basis of previous researches on vehicle-bridge system, the resonance of train bridge coupling system is studied and analyzed from the following aspects. Firstly, the vehicle model with 23 degrees of freedom composed of car body, bogie, wheelset and spring damper suspension is established. The bridge model adopts Euler beam model and discretizes into three dimensional finite element model. Considering the wheel / rail contact force, the element is discretized by the modal synthesis method, and the coordinate transformation of the substructure boundary condition is used to establish the vehicle-bridge coupling vibration equation. Second, the whole stochastic process uses track irregularity as the main excitation source, uses a long time domain sample to simulate instead, and inputs the simulated time domain sample into the vehicle-bridge system. Through the gradual integration method, MATLAB as the main compilation software for programming. Based on the powerful front and rear processor of the finite element analysis software ANSYS, the modal analysis of the simply supported beam is carried out, which is consistent with the previous modes of the numerical calculation. Thirdly, through the comparative analysis of the factors that cause vehicle bridge resonance, vehicle speed, bridge span, span number, irregularity and so on, it is put forward that the vehicle and bridge coupling process, with the speed. When the bridge span and other factors change, the influence of the bridge resonance can provide theoretical analysis support for the vehicle crossing speed limit, or the bridge span structure and so on. Fourth, this paper focuses on the train-bridge coupling system, the finite element software ANSYS simulation analysis, through the train loading frequency analysis of the comparative analysis, and compared with previous research theory. Finally, some useful suggestions are put forward, which are of great significance to the safety and stability of train operation in practical engineering.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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