钢箱梁制造与拼装关键技术问题研究

发布时间：2018-02-10 07:02

本文关键词： 大节段钢箱梁无应力线形和尺寸变形和受力分析线形监控　出处：《华南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：连续钢箱梁桥凭借显著的结构优势与经济优势,在桥梁工程中得到了日益广泛的应用。由于钢箱梁结构的海上施工受到技术难度与恶劣环境等不利条件的制约,大节段工厂制造与现场吊装的施工方法由此得到了重视与发展。因此,对于连续钢箱梁桥的结构体系及其施工工艺研究的进一步完善也更加迫切,特别是结构体系复杂、施工难度较大、设计寿命较长的跨海大桥。本文以在建的港珠澳大桥深水区非通航孔桥为工程背景,其桥型选用单跨长度为110米的连续钢箱梁,施工工艺采用钢箱梁大节段工厂制造与现场吊装。本文主要的研究内容包括:(1)基于无应力状态法,利用有限元软件建立钢箱梁结构仿真模型进行分析,计算主梁的无应力线形;根据梁段的无应力夹角,考虑体系转换与梁段夹角的影响,修正梁段的顶底板长度,计算主梁的无应力尺寸。(2)钢箱梁重量对结构受力和变形的影响不容忽略,通过对小节段称重数据的准确统计,分析修正理论有限元模型;严格控制大节段的无应力制造,监测胎架支墩的变形,及时调整线形误差,确保钢箱梁的理想无应力状态。(3)在吊装过程中,为确保结构的局部变形满足要求并且整体受力处于安全状态,使用有限元软件对牛腿结构及其支点处的钢箱梁建立了精细的板单元模型,进行了整体内力分析以及局部变形分析,并得出了相关结论以指导实际施工。(4)对钢箱梁主梁的制造线形、安装线形以及成桥线形的实测值和理论值分别进行了对比,分析各个工况下钢箱梁主梁线形的误差值,并且对相关结构参数的误差影响分别进行了讨论分析,得出了相关的线形修正措施,对以后同类型桥梁的计算与施工提供一定的参考。
[Abstract]:Continuous steel box girder bridges have been widely used in bridge engineering by virtue of their obvious structural and economic advantages. The offshore construction of steel box girder structures is restricted by technical difficulties and adverse environment. Therefore, the further improvement of structural system and construction technology of continuous steel box girder bridge is more urgent, especially the complexity of structure system. The bridge is difficult to construct and has a long design life. In this paper, the non-navigable bridge in the deep water area of the Hong Kong-Zhuhai-Macao Bridge is used as the engineering background, and the continuous steel box girder with a single span of 110 meters is selected as the bridge type. The main research contents of this paper include: (1) based on the stress-free state method, the finite element software is used to establish the simulation model of the steel box girder structure to calculate the stress-free linear shape of the main girder. According to the unstressed angle of the beam section, considering the influence of the angle between the system transformation and the beam section, the length of the top and bottom slab of the beam section is corrected, and the influence of the weight of the steel box girder on the stress and deformation of the structure can not be ignored, so as to calculate the unstressed size of the main beam. Through the accurate statistics of the weighing data of the section section, the finite element model of the modified theory is analyzed, and the stress free manufacture of the large segment is strictly controlled, the deformation of the support pier of the tyre frame is monitored, and the alignment error is adjusted in time. In order to ensure that the local deformation of the structure meets the requirements and that the overall force is in a safe state during the hoisting process, make sure that the steel box girder is in an ideal stress-free state. A fine plate element model is established for the steel box girder of the corbel structure and its fulcrum by using the finite element software. The integral internal force analysis and local deformation analysis are carried out. The relevant conclusions are obtained to guide the actual construction. (4) to compare the measured and theoretical values of the main girder of the steel box girder in manufacturing, installation and bridge respectively, and to analyze the error of the main girder of the steel box girder under various working conditions. The influence of the error of the related structural parameters is discussed and analyzed respectively, and the relevant linear correction measures are obtained, which provide a certain reference for the calculation and construction of the same type of bridges in the future.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.47

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