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预应力混凝土连续曲线箱梁的设计和施工分析.docx
文档介绍:
暗尔滨工业大学工程硕士学位论文
摘要
目前曲线梁桥在现代化的公路、铁路及城市道路立交中的数量逐年增加, 已经成为现代交通设旋的重要桥型,而曲线梁桥中又以预应力混凝土连续曲线箱梁桥的应用最为广泛。近年来,国内常有曲线梁桥在施工中或建成后发生事故,主要原因是对曲线梁桥中的许多关键问题仍然认识模糊,故对曲线梁桥诸多问题如设计理论与方法、力学特性、荷载特点、构造特点、设计和施工难点的研究就显得非常紧迫、重要。
本文首先对曲线梁桥的基本理论和计算方法等进行了介绍,对目前普遍采用的曲线梁桥实用算法进行了阐述;然后通过作者参与的沈山线绥中公铁立交桥设计和施工的工程实践,以预应力混凝土连续曲线箱梁为研究对象, 重点讨论了其在设计与施工中存在的关键问题,并进行了分析与总结。
通过采用国内先进的曲线梁桥设计计算程序,验算结构的主要几何尺
寸,进行力学分析和预应力设计,解决了预应力混凝土连续曲线箱梁的计算难题,降低了梁高,经济效果显著。本桥在结构上采用了抗倾覆稳定性很好的双支点连续梁方案,这种双支点连续梁在受力上优于单支点连续梁,不但施工安全,而且受力上更趋合理。根据地形采用逐孔施工法施工是合理的, 也是较先进的施工方法,解决了附属设备不能多次利用的问题,保证了施工进度,降低了工程造价。
关键词 曲线箱梁;有限元分析;设计;施工控制
芝奎鎏王兰查兰三:堡堡圭兰堡篓兰
Abstract
Currently the curved girder bridges are increasing year and year in the modem intersections of highway,railway and the city road.They have already e an important bridge tape in the transportation establishment,however in the middle of them,the application of prestressed concrete continuous curved box-girder bridge is the most extensive.In recent years,domestic accidents ofthe curved beam bridges often Occur during the construction or after construction,the
main reason is that there is a lack of deep research on many key problems of curved beam bridges.So it iS very urgent and important to the research on many
problems of curved beam bridges such as design theories and methods,
mechanics characteristic,load characteristic,structure characteristic,the difficulty
ofthe design and construction.
First of all,this paper introduces the basic theory and the calculation
methods of the curved beam bridge,elaborated the practical calculation method
of the curved beam bridge being widespread adopted currently.Then according to
the engineering practice of Suizhong interchange of road over railway in the Shenshan railway which is attended in design and construction by the author, with P.C continuous curved box girder as the research object.some key questions which occurred in the process of design and structure about the curved beam bridge are discussed on focus,furthermore the analy 内容来自淘豆网www.taodocs.com转载请标明出处.
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