文档介绍：Research fort Evaluation and Vibration Control of Steel Box Girder Pedestrian Bridge across the Railway Line A Dissertation Submitted for the Degree of Master Candidate:WangYukai Supervisor:Associate Professor. Yuan Weining Senior Chang’an University, Xi’an, China ·I· 摘要随着我国“十二五”规划的实施,国家铁路网建设进入一个新的快速发展的历史时期。在这期间铁路的新建及既有铁路的提速和电气化改造,使得跨越铁路线的桥梁建设也日益增多。随着钢结构应用领域的拓展,简支钢箱梁桥已成为跨线天桥最常用的结构型式,其振动舒适性问题是铁路站房设计中的一个难点,能否满足规范中对振动舒适性的要求,成为天桥设计过程中的关键所在。本文结合实际工程,应用有限元软件 SAP2000,对人行天桥进行了静力分析、模态分析、动力响应分析、舒适度评价、振动控制等方面的研究,研究内容和结论主要有: ,对其进行静力分析和模态分析,得到该桥的内力、挠度、应力比、自振频率等参数,均满足规范要求。 ,得到该桥的加速度、速度、位移等动力响应值的时程曲线,行人步频越接近桥的自振频率,动力响应值的峰值越大。 ,对梁高为1650mm 和1250mm 的两种天桥作了竖向、侧向和横向的舒适度评价,竖向烦恼率远大于侧向和纵向,%%。 “增大梁高”和“增设调谐质量阻尼器”两种振动控制措施,发现后者的减振效果更显著,%, 个百分点。在论文研究的基础上,建议跨度30m 以上的人行天桥应进行动力验算,跨度50m 以上的还应考虑减振措施;提出基于等效竖向加速度的舒适度评价指标和基于烦恼率的评价标准;比较了两种常用的振动控制措施,以增设阻尼器的减振效果为优。本文为人行天桥的舒适度评价和振动控制设计提供了参考,具有一定的工程实用价值。关键词:跨线天桥,钢箱梁,动力响应,舒适度,振动控制,烦恼率,调谐质量阻尼器·II· Abstract With the implementation of China's "12th 5-year plan", the national railway network construction has entered a new historical period of rapid development. During this period,as a result of new railway and speeding it up and its electrification, the construction of a bridge across the railway line are increasing. With the expansion of the steel applications, simply supported steel bridge has e the monly used structure type as theflyoverand its fort is thecrux as well as the aproria in the design of railway stations, also the ability to meet the specifications for vibration comfort requirements esthe key flyover in the design process. In this paper, with the actual project, and the application of finite element software SAP2000,the static analysis, modal analysis, dynamic response analysis, fort rating andvibration control forpedestrain bridge are carr