大跨度钢桁梁斜拉桥施工控制分析

发布时间：2018-03-08 14:17

本文选题：钢桁梁斜拉桥　切入点：制造线形　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：钢桁梁斜拉桥独有的桁架结构形式，使其具有承载能力强、整体刚度大、跨径大等特点，随着我国高速铁路建筑的快速发展，，钢桁梁斜拉桥越来越成为未来桥梁的发展方向。本文以贵广铁路思贤窖特大钢桁梁斜拉桥为工程背景，就其施工控制中几个关键性因素进行了分析：（1）钢桁梁斜拉桥施工过程中线形走向直接关系到钢桁梁的合拢和最终设计成桥状态的形成，本文研究了钢桁梁斜拉桥制造线形和安装线形的分析计算，并研究了它们的内在联系。钢桁梁斜拉桥一般通过改变弦杆长度来实现预拱度，本文研究了弦杆长度改变量的几种计算方法；（2）钢桁梁斜拉桥合拢具有合拢点多、合拢精度要求高、调整难道大等特点，因而对其合拢状态的分析尤为重要，本文分析了钢桁梁斜拉桥合拢所需的唯一的合拢状态，并介绍了它的计算；（3）非垂直的斜拉索在自重作用下会产生垂度效应，使得斜拉索计算索力和实际索力存在偏差，本文研究了修正这种偏差的方法，钢桁梁斜拉桥施工过程中为获取特定的安装线形需要对斜拉索索力进行临时调整，待全桥合拢后恢复，且施工方法的不同也会引起斜拉索索力的改变，本文均有研究。
[Abstract]:The unique truss structure form of steel truss girder cable-stayed bridge makes it have the characteristics of strong bearing capacity, large overall stiffness and long span. With the rapid development of high-speed railway construction in China, Steel truss girder cable-stayed bridge is becoming the development direction of future bridge more and more. This paper takes Sixian Jiao extraordinarily large steel truss girder cable-stayed bridge in Gui-Guangzhou Railway as the engineering background, and analyzes several key factors in its construction control. 1) the alignment of steel truss cable-stayed bridges is directly related to the closure of the steel truss and the formation of the final design of the bridge. This paper studies the analysis and calculation of the manufacture and installation of the steel truss cable-stayed bridges. Steel truss girder cable-stayed bridge is usually used to change the chord length to achieve pre-arched degree. In this paper, several calculation methods of chord length change are studied. 2) the closure of steel truss cable-stayed bridge is characterized by many closing points, high precision and large adjustment, so it is very important to analyze the closure state of steel truss cable-stayed bridge. In this paper, the unique closure state of steel truss cable-stayed bridge is analyzed. Its calculation is also introduced. 3) the non-vertical cable will have sag effect under the action of deadweight, which makes the calculation of cable force deviate from the actual cable force. This paper studies the method of correcting this deviation. In order to obtain the special installation line of steel truss girder cable-stayed bridge, it is necessary to adjust the cable force temporarily, to be restored after the whole bridge is closed, and the different construction methods will also cause the change of cable force.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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