【作者】 吴游宇；

【导师】 吴卫国；

【作者基本信息】 武汉理工大学 ， 结构工程， 2004， 硕士

【摘要】 近年来，钢管混凝土拱桥作为一种新兴的应用新材料的桥型，由于自身的优点以及与我国的桥梁建设的实际情况相适合，因此得到了极大的发展。 然而，对于钢管混凝土拱桥设计理论的研究而言，其发展现状相对落后于工程实践，在动力性能方面的探索更落后于静力方面的成果。目前，钢管混凝土拱桥正朝大跨、轻型的方向发展，因此，该类型桥梁的动力特性也日益引起重视，象地震、风振、车振等桥梁的典型动力问题也是该类桥梁所无法回避的。 本文以某铁路钢管混凝土拱桥(野三河大桥)为背景，运用通用有限元软件ANSYS对其进行动力分析，主要开展了如下的工作： 1、对整桥建立空间有限元模型，进行动力特性的计算，且对建模的思路和方法方面做了比较和探索；在计算结果的基础上，结合其他同类型桥梁的理论计算和试验结果，分析了该类型桥梁的动力特征。从分析结果来看，钢管混凝土拱桥一般属于较柔性结构。作为该类型的大跨度桥梁，应重视其动力问题。面外刚度一般弱于面内刚度，因此其横向振动和稳定性问题是关键；特别是对于宽跨比较小，承载较大的铁路桥梁。 2、在结构型式和构造等方面对上述模型进行更改，计算分析随之所引起的动力特性变化情况，对影响因素加以剖析，探讨优化该类型桥梁动力特性的思路，以期在相关的设计过程中起到参考作用。从分析结果来看，从变更横撑数目、布局，变化吊杆布置形式，更改约束条件等方面可以较显著地优化整桥动力特性。 3、对车桥耦合振动这一业内的难点进行了理论上的分析，引入了一种建立和求解车桥耦合振动系统方程的较为典型的方法，提出了一份自行编制程序的流程简图；借用ANSYS软件对该桥做了车桥耦合振动的初步模拟计算，探索车桥共振的基本特点。然而，车桥耦合振动是一个复杂且随机性很强的动力学过程，文中车桥共振的研究工作尚属于一种方法上的探索和尝试的阶段——只有采用更为复杂而真实的桥梁和车辆模型，应用更为合适的计算思路和更有针对性的程序，考虑可能存在的各种随机因素，方可有效地应用于工程实际。更多还原

【Abstract】 In recent years , as a new-type bridge, concrete-filled steel tubular(CFST) arch bridge has been deeply developed in our country’s construction, for its own merits and can luckily make agreement with the factual situation of bridge engineering.However, the study on design theories of CFST arch bridge gets relatively behind the engineering practice, and the search on dynamic performance of this structure get relatively behind the production on static feature of this structure. Presently, CFST arch bridges develop in the direction of large-span and lightweight style, accordingly, investigators and devisers should increasingly attach more importance to their dynamic behaviour, and some typical dynamic matter of bridges, such as seismic response, wind induced vibration, coupled dynamic vibration between bridge and vehicle should not be ignored.In this thesis, taking the example of some railroad CFST arch bridge (Yesanhe bridge), with the help of ANSYS, one universal FEM software, author analyze its dynamic behaviors and abstract it as follows:1. Establish 3-D finite element model of this whole bridge, calculate its dynamic characteristics, besides ,compare and study ways of establishing FE model; on the basis of this result, comparing the theorial and practical results of other bridges of such type, summarize dynamic characteristic of these bridges .2. Modify above model along with altering structural form or the constitution of the bridge, calculate the variety of dynamic character, analyze this factors which will affect, discuss appropriate ways to optimize the dynamic character, wishing provide certain use of reference to design.3. As to vehicle-bridge system coupling vibration, this difficulty in engineering industry, it was abstractly summarized in this thesis, and introduce a method to establish and resolve equations about such coupling vibration, bring forward a flow chart to write correlative software; with the help of ANSYS , make out some work about preparatory simulation, so as to research basic point of chicle-bridge system coupling vibration .更多还原