武汉轻轨桥梁声屏障车致振动分析

武汉轻轨桥梁声屏障车致振动分析(任务书,开题报告,论文13000字)
摘要
随着科技和技术的发展，人们生活水平的不断提高，交通工具的不断发展，轨道交通与人们的生活产生着越来越紧密的联系，轨道交通在通过一些城区敏感点时，需要采取必要的噪声控制措施；对于轨道交通的噪声问题，设立屏障是非常有用的方法。
随着轻轨高架桥的声屏障迅速发展及声屏障的普遍应用，轻轨高架桥声屏障的破坏问题逐渐破坏出来，近年来不断出现了螺栓脱落、亚克力板开裂等情况，危及列车行驶安全。高速运行的轨道交通中出现类似的破坏现象早就引起人们的关注，并已有很多关于列车风荷载引起的声屏障振动的研究，但是对于较低速度运营的轻轨交通，列车风荷载远不如高速轨道中明显，列车与桥梁之间的耦合振动可能称为声屏障破坏的重要影响因素。本文主要利用ANSYS有限元软件建模，采用移动荷载列的加载方式，计算得出声屏障的振动加速度以及频谱反应图，对比实测数据，研究车桥耦合振动可能导致的声屏障的破坏影响。研究结果表明列车荷载的作用位置是声屏障产生破坏的重要影响因素，声屏障的水平横向振动在声屏障的动力响应中占主要部分。
关键词：轨道交通、车桥耦合、声屏障

Abstract
With the rapid development of science and technology, and the improving of our life, the transport tools are developing very fast, so it is with the railway. The railway is getting more and more close to everybody’s life. It is necessary to take necessary noise control measures when the railway traffic passing through some sensitive spots in urban areas. It is very useful to set up barriers for rail traffic noise problems.
With the widespread application of noise barrier and the rapid development of rail viaduct, the damage problem of the noise barrier is getting more and more serious. In recent years the bolts fall off and the acrylic plate crack more and more frequently, it causes great damage to the safety running of the railway. The similar damage phenomenon has caused people’s attention in the high-speed railway, and it has already caused many researches about the vibration of the noise barrier caused by train draft pressure. But when it comes to the low speed railway structure, the train draft pressure is not as remarkable as it is in the high speed railway structure. This article uses ANSYS finite element software, using the loading mode of moving load column, working out the vibration acceleration and the spectrogram of the noise barrier. And contrast it to the actual measurement, do researches on the damage on the noise barrier caused by the Vehicle-bridge interaction. The result of the research points out that the load position of the train pressure is the most important influence factor of the noise barrier’s damage. The horizontal vibration of the noise barrier is the mainly part of the dynamic response of noise barrier.
Key words: railway, Vehicle-bridge interaction, noise barrier
目录
第1章 绪论    1
1.1研究背景及意义    1
1.2 国内外研究现状    1
1.2.1研究历史    1
1.2.2 国内外研究现状    2
1.3 本文完成的主要工作    3
第2章 桥梁声屏障的车致振动的现场测试及数据分析    4
2.1工程概况    4
2.2试验仪器和设备    6
2.3试验内容及步骤    6
2.4试验数据分析    8
2.5本章小结    14
第3章 桥梁-声屏障有限元模型的建立    16
3.1有限元基本理论的介绍    16
3.2桥梁-声屏障有限元模型的建立    16
3.3桥梁声屏障有限元模型的验证    17
3.4本章小结    19
第4章 桥梁-声屏障的动力响应分析    20
4.1荷载的输入    20
4.1.1车辆荷载模型    20
4.1.2加载方式简介    20
4.1.3等效节点荷载    21
4.1.4阻尼矩阵    21
4.2计算方法的选取与验证    22
4.2.1计算方法选取    22
4.2.2计算方法验证    23
4.3计算结果与分析    24
4.3.1声屏障H型钢立柱顶端3#计算结果与分析    24
4.3.2 亚克力板7＃点的计算结果与分析    26
4.3.3桥梁跨中1#的计算结果与分析    27
4.4本章小结    29
第5章 结论与展望    30
5.1结论    30
5.2展望    30
参考文献    31
致谢    32