无背索斜拉桥施工控制关键技术

发布时间：2018-03-02 11:22

本文选题：无背索斜拉桥　切入点：有限元　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：无背索斜塔斜拉桥结构形式新颖独特，打破了传统直塔斜拉桥的设计理念。其具有优美的外形，桥梁结构无背索丰富了桥梁结构与景观之间的协调关系。斜拉索不仅为主梁提供弹性支撑，还要依靠斜拉索索力来平衡倾斜的桥塔自重引起的倾覆力矩，正由于主塔结构不设背索，塔身倾斜，施工难度较大，尤其是主塔的施工过程中线形控制和安全控制尤为关键，目前为止世界范围内已建成的无背索斜拉桥数量比较少。本文对国内外现有的无背索斜拉桥分析，介绍了无背索斜拉桥施工控制的特点、影响因素和施工控制方法。根据依托工程无背索混凝土斜拉桥的背景资料，采用桥梁专用有限元分析软件Midas civil2012(V8.0.5)建立施工控制模型进行分析，结合斜塔无背索斜拉桥的结构特点，充分利用斜拉索索力在混凝土主塔施工过程的作用，对混凝土主塔的施工方案进行优化，并进行了安全性验算。总结出斜塔无背索斜拉桥主塔在施工过程中各个主塔节段立模位置各个方向的预偏位的通用计算公式，并在施工阶段对主塔悬臂施工的温度效应进行分析，考虑年温度变化对主塔悬臂施工各节段预偏位的影响，给出不同温度下主塔各施工节段预偏位的修正值。根据现场对主塔、主梁的线形及应力和斜拉索索力的实时监控，通过实测数据与理论数据的分析对比，，主梁应力、主梁线形、主塔应力、主塔线形、斜拉索索力均接近理论设计水平，来验证本论文提出的优化施工方案的可行性。
[Abstract]:The structure of cable-stayed bridge without back cable tower is novel and unique, which breaks the design idea of traditional cable-stayed bridge with straight tower. The bridge structure without back cable enriches the harmonious relationship between the bridge structure and the landscape. The cable not only provides elastic support for the main beam, but also relies on the cable force to balance the overturning moment caused by the self-weight of the inclined tower. Because the main tower structure has no back cable and the tower body is inclined, it is difficult to construct, especially the linear control and safety control are very important in the construction process of the main tower. So far, the number of cable-stayed bridges without back cable has been few in the world. This paper analyzes the existing cable-stayed bridges without back cables at home and abroad, and introduces the characteristics of construction control of cable-stayed bridges without back cables. According to the background data of the concrete cable-stayed bridge without back cable, the construction control model is established by using the special finite element analysis software Midas civil 2012V8.0.5), and the structural characteristics of the cable-stayed bridge without back cable are combined. The construction scheme of concrete main tower is optimized by making full use of the effect of cable-stayed cable force in the construction process of concrete main tower. The safety checking calculation is carried out, and the general calculation formula of the pre-deflection of the main tower of the cable-stayed bridge without back cable in each direction of the main tower section position during the construction process is summarized. The temperature effect of the main tower cantilever construction is analyzed in the construction stage. Considering the influence of annual temperature change on the pre-deflection position of the main tower cantilever construction section, the correction value of the main tower construction section pre-deflection position under different temperatures is given. Through the analysis and comparison between the measured data and the theoretical data, it is found that the stress of the main beam, the linear shape of the main beam, the stress of the main tower, the linear force of the main tower and the cable force of the stay cable are all close to the theoretical design level. To verify the feasibility of the optimal construction scheme proposed in this paper.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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