三拱肋下承式钢拱桥顶推施工关键技术研究

发布时间：2018-01-14 11:24

本文关键词：三拱肋下承式钢拱桥顶推施工关键技术研究　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：顶推施工于半个世纪前首次出现,发展至今应用广泛。顶推施工具有不影响桥下既有线路运营、安全可靠、施工周期较短等诸多优点。虽然顶推技术已经较为成熟,但顶推施工多数用于混凝土梁桥的建设。随着钢拱桥应用的增多,钢拱桥的顶推施工有望在特定条件下被广泛应用。论文以贵州省盘县红果经济开发区上跨盘西支线、水红铁路立交桥为工程背景,进行了钢拱桥顶推施工关键技术的研究和讨论,完成的主要工作如下：1.介绍了钢拱桥以及顶推施工的发展,对钢拱桥顶推施工法的研究现状进行了分析。总结了顶推施工的原理、分类、施工技术和施工特点,以及顶推施工过程中常见的问题。2.顶推施工过程结构受力非常复杂,论文采用MIDAS CIVIL软件对红果桥整体顶推施工过程进行全桥整体分析计算。分析了结构的位移、受力以及支座反力的情况及变化规律,找出了结构的最不利受力工况。3.对导梁的设计进行了研究,导梁的设计中应考虑长度、刚度、质量等参数的合理取值,通过改变导梁设计参数,对比结构在顶推施工过程中的受力情况,进行优化分析。对顶推施工过程中拱肋临时支撑的设置、结构型式进行了研究及分析。4.最后论文通过采用MIDAS FEA软件进行板壳单元局部有限元建模,较精细地计算分析最不利工况下钢箱梁的受力情况,得到了支撑点附近板件的应力分布。并针对钢箱梁各构件参数的变化(顶板、底板、底板加劲肋及横隔板等),分析钢箱梁板件板厚的变化对局部稳受力性能的影响,并提出改善局部受力的意见,以期对今后的类似工程提供参考借鉴。
[Abstract]:Thrust construction appeared for the first time half a century ago and has been widely used up to now. The jacking construction has no influence on the operation of existing lines under the bridge and is safe and reliable. The construction period is short and so on. Although the pushing technology has been more mature, most of the jacking construction is used in the construction of concrete beam bridge. With the increase of steel arch bridge application. The jacking construction of steel arch bridge is expected to be widely used under certain conditions. The paper takes the cross-pan west branch of Hongguo Economic Development Zone of Pan County Guizhou Province and the Shuihong Railway overpass as the engineering background. The key technology of steel arch bridge jacking construction is studied and discussed. The main work accomplished is as follows: 1. The development of steel arch bridge and its jacking construction is introduced. This paper analyzes the present research situation of steel arch bridge jacking construction method, and summarizes the principle, classification, construction technology and construction characteristics of the jacking construction method. As well as the common problems in the process of pushing construction. 2. The force of the structure in the process of pushing construction is very complex. The whole construction process of Hongguo Bridge is analyzed and calculated by MIDAS CIVIL software. The displacement of the structure, the force and the reaction force of the support are analyzed. The design of the guide beam should consider the reasonable value of the parameters such as length, stiffness and mass, and the design parameters of the guide beam should be changed by changing the design parameters of the guide beam. Compare the stress situation of the structure in the process of pushing construction, carry on the optimization analysis, and set up the temporary support of the arch rib in the process of the jacking construction. The structure type is studied and analyzed. Finally, the local finite element model of shell element is established by using MIDAS FEA software. The stress distribution of the steel box girder near the supporting point is obtained by calculating and analyzing the stress situation of the steel box girder under the most unfavorable working conditions, and aiming at the change of the parameters of the steel box girder component (roof, bottom plate). In this paper, the influence of plate thickness of steel box girder on local stability is analyzed, and suggestions for improving local force are put forward in order to provide reference for similar projects in the future.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.462

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