预应力混凝土连续梁桥的力学特性与关键技术研究

发布时间：2018-06-13 16:05

本文选题：连续梁桥 + 设计　；参考：《北京交通大学》2014年硕士论文

【摘要】：摘要：预应力混凝土梁桥作为交通建设中必不可少的重要组成部分,得到了迅速展。在40-200米跨径范围内,无论是从结构受力特性还是经济性角度考虑,预应力混凝土连续梁桥常常成为较理想的桥型。因此,对预应力混凝土连续梁桥的设计施工关键技术研究也显得尤为重要。本文针对某三跨预应力混凝土连续梁桥(65m+100m+65m)的设计和施工关键技术进行研究,在目前的施工技术和研究经验的基础上,进一步研究了预应力混凝土连续梁桥上部结构的施工技术及连续梁桥施工技术中的一些问题,并进行计算分析。主要研究工作如下： (1)调研和论述了预应力混凝土连续梁桥状况的包括阿富汗在内的国内外发展现状。之后简单介绍了该桥特点及发展趋势,并展现了本论文需要研究的主要内容、预应力混凝土梁桥设计计算理论及分析方法。 (2)根据现有设计规范和经验拟定预应力混凝土连续梁桥设计参数,利用有限元分析软件Midas Civil建立计算模型,计算分析全桥的内力与变形情况,包括悬臂施工阶段时各T构内力和挠度变化情况。分析研究了不同合拢顺序方案对全桥施工以及运营阶段应力和线形的影响情况,以及混凝土收缩徐变3年、10年的应力和挠度变形情况,根据各种方案的优缺点。得出了有益的结论。 (3)简单阐述了中国铁路桥涵和公路桥涵的温度荷载的规定,还阐述了美国规范、英国规范、澳大利亚规范、新西兰规范、法国规范等对温度荷载模式的规定,结合上述规范对预应力混凝土连续梁桥的温度应力与变形进行了计算分析,总结了温度变化下连续梁桥的变化趋势。 (4)研究了连续梁桥的施工方法：支架浇筑法、预制安装法、悬臂施工法、顶推施工法、转体施工法等。主要研究了预应力混凝土连续梁桥的悬臂施工技术,包括对悬臂浇筑挂篮施工段、边跨支架现浇段、合拢段的施工技术和施工工艺,和对大体积混凝土浇筑、支架施工、模板安装、钢筋施工、预应力张拉施工及预应力管道施工等各阶段施工技术进行了研究和介绍。对合拢段的临时锁定的结构措施和施工方法也进行了研究。
[Abstract]:Abstract: as an essential part of traffic construction, prestressed concrete beam bridge has been developed rapidly. In the span range of 40-200 meters, the prestressed concrete continuous beam bridge is often an ideal bridge type, whether from the point of view of the structural mechanical characteristics or the economy. Therefore, it is very important to study the key technology of design and construction of prestressed concrete continuous beam bridge. In this paper, the key technology of design and construction of a three-span prestressed concrete continuous beam bridge (65m 100m 65m) is studied. Based on the current construction technology and research experience, The construction technology of the superstructure of the prestressed concrete continuous beam bridge and some problems in the construction technology of the continuous beam bridge are further studied, and the calculation and analysis are carried out. The main research work is as follows: 1) the status quo of prestressed concrete continuous beam bridges including Afghanistan is investigated and discussed. After that, the characteristics and development trend of the bridge are briefly introduced, and the main contents of this paper need to be studied. The design calculation theory and analysis method of prestressed concrete beam bridge. 2) according to the existing design code and experience, the design parameters of prestressed concrete continuous beam bridge are worked out, and the calculation model is established by using the finite element analysis software Midas Civil. The internal force and deformation of the whole bridge are calculated and analyzed, including the changes of each T-structure internal force and deflection in the cantilever construction stage. The influences of different closure sequence schemes on the stress and line shape of the whole bridge during construction and operation are analyzed and studied, as well as the stress and deflection of concrete in 3 years and 10 years, according to the advantages and disadvantages of the various schemes. A useful conclusion is drawn. (3) the provisions of the temperature load of Chinese railway bridges and culverts are briefly elaborated, and the American Code, British Code, Australian Code, New Zealand Code, and New Zealand Code are also expounded, as well as the United States Code, the British Code, the Australian Code and the New Zealand Code. The temperature stress and deformation of prestressed concrete continuous beam bridge are calculated and analyzed in accordance with the rules of the French Code and other codes on the temperature load mode, and the above codes are used to analyze the temperature stress and deformation of prestressed concrete continuous beam bridge. This paper summarizes the changing trend of continuous beam bridge under the change of temperature. 4) the construction methods of continuous beam bridge are studied, such as support pouring method, precast installation method, cantilever construction method, pushing construction method, rotary construction method, etc. This paper mainly studies the cantilever construction technology of prestressed concrete continuous beam bridge, including the construction technology and technology of cantilever pouring hanging basket section, side span support cast-in-place section, closing section, mass concrete pouring, support construction, etc. The construction technology of formwork installation, steel bar construction, prestressed tensioning construction and prestressed pipeline construction are studied and introduced. The structural measures and construction methods of temporary locking of closure section are also studied.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U445.4

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