受风和温度影响的大矢跨比钢箱拱桥施工方案及控制技术

发布时间：2018-02-16 06:37

本文关键词： 钢箱拱肋风荷载效应温度荷载效应稳定性塔架　出处：《江苏科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着拱桥跨径的增大，国内外桥梁专家和研究学者在钢箱拱肋拱桥结构所受风荷载效应和温度荷载效应方面做了一系列研究，但大多集中于成桥阶段，而对施工过程中钢箱拱肋的风荷载效应和温度荷载效应的研究相对较少。本文以在建的鄂尔多斯市伊克昭大桥为工程背景，对施工过程中钢箱拱肋及塔架结构受风荷载效应和温度荷载效应影响下结构的变形、应力以及稳定性进行了研究，，得出了有益结论，可为日后同类桥型的施工提供一定的参考。本文首先系统论述了国内外钢箱拱桥风荷载效应和温度荷载效应的研究现状，介绍了桥梁结构第一类、第二类稳定问题的基本概念，阐述了第一类稳定问题的线弹性有限元理论。重点介绍了桥梁结构有限元软件Midas/civil对结构屈曲分析的基本原理。接着论述了温度荷载效应的相关理论,并对分析温度场的两种常用方法进行了详细阐述。其次，对伊克昭大桥的工程概况做了简单介绍，提出了三种吊装方案，通过方案比选，确定采用一次性支架整体翻转整体提升方案。运用桥梁有限元软件Midas/civil建立拱肋和塔架模型，将施工过程划分为三个工况，研究拱肋和塔架处于不同工况下计入风荷载效应和温度荷载效应前后结构的位移、应力及稳定性。结果表明：在拱肋整体翻转阶段，计入风荷载效应和温度效应的影响，拱肋结构具有较大的安全储备，结构安全稳定；焊接风撑时，拱肋控制截面变形受风荷载效应影响较大，受温度荷载效应影响较小；吊杆张拉施工时应考虑风荷载效应和温度效应对拱肋竖向变形的不利影响；塔架的稳定性受风荷载影响很大，尤其是整体提升阶段，塔架稳定性较弱，应引起足够的重视；计入风荷载效应和温度荷载效应的影响后，塔架缆风索仍具有具有较大的安全储备，拉索安全。本文的研究成果可为日后同类桥梁的设计与施工提供一定的借鉴和理论指导，同时也为相关规范以及标准的完善提供一定得参考意见。
[Abstract]:With the increase of span of arch bridge, bridge experts and researchers at home and abroad have done a series of research on the effect of wind load and temperature load on steel box arch rib arch bridge, but most of them are focused on the stage of bridge completion. However, there are few researches on the wind and temperature load effects of steel box arch ribs during the construction process. This paper takes the construction of the Erdos Ikezhao Bridge as the engineering background. The deformation, stress and stability of steel box arch rib and tower structure under the influence of wind load and temperature load are studied, and some useful conclusions are obtained, which can provide some reference for similar bridge construction in the future. In this paper, the research status of wind load effect and temperature load effect of steel box arch bridge at home and abroad is systematically discussed, and the basic concepts of the first kind and the second kind of stability problem of bridge structure are introduced in this paper. In this paper, the linear elastic finite element theory of the first kind of stability problem is expounded. The basic principle of the structural buckling analysis of the bridge structure with the finite element software Midas/civil is emphatically introduced, and then the related theory of the temperature load effect is discussed. Two common methods for analyzing temperature field are described in detail. Secondly, the general situation of the Ikezhao Bridge is briefly introduced, and three hoisting schemes are put forward. The whole lifting scheme of one-off support is adopted. The arch rib and tower model are established by using the bridge finite element software Midas/civil, and the construction process is divided into three working conditions. The displacement, stress and stability of arch rib and tower before and after considering wind load effect and temperature load effect under different working conditions are studied. The results show that the influence of wind load effect and temperature effect is taken into account in the whole arch rib turnover stage. The arch rib structure has a large safety reserve and the structure is safe and stable, and the deformation of the arch rib control section is greatly affected by the wind load effect and is less affected by the temperature load effect when the welding wind braces. The adverse effect of wind load and temperature effect on vertical deformation of arch rib should be taken into account in the construction of suspender tensioning, the stability of tower is greatly affected by wind load, especially in the whole lifting stage, the stability of tower is weak, which should be paid enough attention to. After taking into account the effects of wind load and temperature load, the tower cable wind cable still has a large safety reserve and cable safety. The research results of this paper can provide some reference and theoretical guidance for the design and construction of similar bridges in the future. At the same time for the improvement of relevant norms and standards to provide certain reference.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.22

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