基于桥面不平整度大跨度斜拉桥的行车舒适性研究

发布时间：2018-03-14 01:01

  本文选题：大跨度斜拉桥　切入点：行车舒适性　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：车辆行驶在桥梁之上,在车辆发动机、桥面不平整度等激励下桥梁会发生振动现象,桥梁的振动效应反作用于车辆系统致使其振动加剧,车辆移动荷载的加载效应比静荷载加载的效应明显,同时振动也会影响乘客的行车舒适性。大跨度斜拉桥作为现代桥梁跨越大、自重质量小等优点成为很多跨越江河的首选桥型之一,其刚度相对其它梁桥刚度要小,所以有必要对大跨度斜拉桥的车-桥耦合的振动响应以及行车舒适性进行研究。本文从两个方面对大跨度斜拉桥的车-桥耦合振动着手研究：第一以桥梁结构作为研究对象,移动荷载的作用会对桥梁有一个放大作用效应,即冲击作用效应,振动会导致桥梁结构的安全性以及耐久性产生消极影响；第二以车辆为研究对象,在桥面不平整度、桥梁反作用于车辆的振动效应等激励会影响车体的各向(纵向、横向、竖向)加速度,从而影响乘客的行车舒适性。本文研究内容如下：(1)通过查阅文献总结了国内外的关于车-桥耦合振动研究,分别从铁路桥梁、汽车桥梁等介绍了其研究方法以及两者相应的区别；(2)通过分析不同车辆模型(1/4车辆模型、1/2车辆模型、三维空间车辆模型)得到相应的车辆振动微分方程,选择三维空间(7自由度)车辆模型作为本文研究的车辆模型,同时通过有限元软件建立了桥梁模型并且推导得到桥梁振动微分方程,最后根据桥梁系统以及车辆系统之间的相互关系(位移协调和作用力平衡)求解车-桥耦合振动方程；(3)通过不同参数(车速、车重、桥梁质量、桥面不平整度、车辆悬架刚度、桥梁阻尼比)研究其振动响应以及冲击系数,表明车速、车重、桥梁质量、桥面不平整度参数对其影响较大,车辆悬架刚度、桥梁阻尼比参数相对影响小些,冲击系数的大小不仅和规范规定的桥梁基频有关,而且还和荷载作用、以及桥面不平整度等参数有关；(4)根据Matlab编制的车-桥耦合振动软件,计算了车体的各向(纵向、横向、竖向)加速度,并以IS02631的加权加速度为行车舒适性评价标准,分析了车重、车速、桥面不平整度等参数对行车舒适性的影响,同时以良好行车舒适性的第二类型舒适度加速度为界限,计算车辆在不同桥面等级下的建议车速,为车辆过桥在车速方面提供一定的理论依据。
[Abstract]:The vehicle on the bridge, in the vehicle engine, the bridges of the whole bridge excitation will vibrate, the vibration effect of bridge vehicle system due to its effect on the vibration of vehicles moving load, load effect is more obvious than the effect of static load, the vibration will affect passengers riding comfort of long span. Cable-stayed bridge as a modern bridge, the advantages of small weight quality become a preferred type of crossing rivers, the stiffness of the beam relative to other Qiaogang would be small, so it is necessary for the long-span cable-stayed bridge vehicle bridge coupling of vibration response and driving comfort. Research on the coupled vibration of bridge this paper from the two aspects of the long-span cable-stayed bridge vehicle: the first to bridge structure as the research object, the effect of moving load will have a magnifying effect on the bridge, namely the impact effect, The vibration will lead to negative effect of bridge structure safety and durability; second in the vehicle as the research object, on the road roughness, bridge effect on the vehicle vibration excitation will affect body (longitudinal, transverse and vertical anisotropy) acceleration, thus affecting the riding comfort of passengers. The contents of this paper are as follows: (1) through the literature at home and abroad are summarized. The research on vehicle bridge coupled vibration, respectively from the railway bridge, vehicle bridge introduces its research methods and the difference between the corresponding two; (2) through the analysis of different vehicle model (1/4 1/2 vehicle model, vehicle model, vehicle model three-dimensional space vehicle) the vibration of the corresponding differential equation, choose the three-dimensional space (7 DOF) vehicle model as the vehicle model in this paper, the finite element software to establish the bridge model and derived the micro vibration of bridge The differential equation based on the relationship between bridge system and vehicle system (displacement and force balance equation for vehicle bridge coupling vibration); (3) through different parameters (speed, weight, quality of the bridge, bridge deck roughness, vehicle suspension stiffness, damping ratio of bridge) to study the vibration response and impact coefficient show, speed, weight, quality of the bridge, the roughness parameters have great influence on the vehicle, suspension stiffness, damping ratio of bridge parameters relatively low impact, the impact coefficient is not only the size and specification of the bridge based on frequency, and load, and the roughness parameters (; 4) according to the software Matlab for the vibration of vehicle bridge coupling, the calculated anisotropy (longitudinal, transverse, vertical acceleration, acceleration) and a weighted IS02631 for driving comfort evaluation standards, analysis of the vehicle weight, vehicle speed, road The influence of flatness and other parameters on driving comfort is also discussed. Based on the second types of comfort and acceleration of good driving comfort, the recommended speed of vehicles under different deck grades is calculated, which provides a theoretical basis for vehicle crossing and speed.

【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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本文编号：1608907