大跨度自锚式悬索桥施工阶段的受力分析

发布时间：2018-03-22 11:02

本文选题：自锚式悬索桥　切入点：MIDAS　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：自锚式悬索桥的随着桥跨的增加,加劲梁的轴向应力加大和体系的转换更加困难的特点,已成为设计的控制关键点,大跨度空间缆索自锚式悬索桥的施工将面临更大的挑战。因此,提高材料强度,增加跨越能力,减少静荷载,研究和开发新材料,以及方便的系统转换和加快施工进度等,都是未来研究的重要课题。本文进行了施工阶段受力分析法及无应力状态法在自锚式悬索桥施工阶段应用研究,研究工作及结论如下:①本文梳理了自锚式悬索桥的结构特征、发展历程、结构类型和计算理论方法,文章把无应力状态法的理念引入到自锚式悬索桥的施工作业中,并进行了简单的理论推导。②本文以吉林松原天河大桥自锚式悬索桥为例,用MIDAS常用有限元软件进行模型的建立,进行建模流程和选取单元原则分析。③运用有限元的计算理论和大型有限元软件,研究了大跨度空间缆索自锚式悬索桥在施工阶段的受力分析,得到自重与移动荷载作用下,悬索桥各个重要位置的内力,挠度,支点反力等参数的变化规律。④运用无应力状态法对自锚式悬索桥进行荷载效应研究,进行无应力状态法在自锚式悬索桥施工阶段应用的探讨,表明自锚式悬索桥应用无应力状态法的可行性。⑤文章对自锚式悬索桥的吊杆张拉施工进行的研究,其中无预偏施工法简化了施工步骤,还能够加快施工的进程。本文中所用的案例比较特殊,它是大跨度空间缆索自锚式悬索桥,其结构特征与一般自锚式悬索桥的结构特性相比就比较新颖。文章里还提出了解决自锚式悬索桥工程实际问题的新思想、新方法。一方面将无应力施工法的理念引入进来,从另外一个角度上进行自锚式悬索桥的施工控制;另外一个方面是吊索的张拉次序调整与无索鞍预偏的作业方法的结合,给自锚式悬索桥施工提供的新的思路。
[Abstract]:With the increase of the span of the self-anchored suspension bridge, the increasing axial stress of the stiffened beam and the transformation of the system are more difficult, which has become the key point of the design. The construction of long-span space cable self-anchored suspension bridge will face more challenges. Therefore, improving material strength, increasing span capacity, reducing static load, researching and developing new materials, convenient system conversion and speeding up construction progress, etc. This paper studies the application of stress analysis and stress state method in the construction stage of self-anchored suspension bridge. The research work and conclusion are as follows: 1 this paper combs the structural characteristics of self-anchored suspension bridge. In this paper, the concept of no-stress state method is introduced into the construction operation of self-anchored suspension bridge, and a simple theoretical derivation of .2 this paper takes the self-anchored suspension bridge of Songyuan Tianhe Bridge in Jilin Province as an example. The modeling process and the principle of selecting the element are analyzed by using the finite element software (MIDAS), and the finite element theory and the large-scale finite element software are used to analyze the modeling flow and the selection of the element principle. The internal force and deflection of each important position of the suspension bridge under the action of deadweight and moving load are obtained by studying the stress analysis of the long-span space cable self-anchored suspension bridge in the construction stage. The variation regularity of parameters such as fulcrum reaction. .4 the load effect of self-anchored suspension bridge is studied by using the non-stress state method, and the application of the no-stress state method in the construction stage of self-anchored suspension bridge is discussed. It shows that the self-anchored suspension bridge is feasible to use the stress-free state method. 5. The paper studies the construction of the self-anchored suspension bridge with the suspension rod tension, in which the construction procedure is simplified by the method of no pre-bias construction. It can also speed up the construction process. The case used in this paper is quite special. It is a long-span space cable self-anchored suspension bridge. Compared with the general self-anchored suspension bridge, its structural characteristics are relatively new. In this paper, a new idea and a new method to solve the practical problems of self-anchored suspension bridge are put forward. On the one hand, the concept of no-stress construction method is introduced. The construction control of the self-anchored suspension bridge is carried out from another angle, the other aspect is the combination of the tension sequence adjustment of the sling and the operation method of pre-deflection without saddle, which provides a new way of thinking for the construction of the self-anchored suspension bridge.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.25

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