考虑主缆抗弯刚度的自锚式悬索桥力学性能与参数分析

发布时间：2018-10-19 14:23

【摘要】：目前,自锚式悬索桥因其地形适应性强、造型美观等诸多优点而在国内外受到越来越多的重视。虽然自锚式悬索桥在近年来的发展相当迅速,但从其固有的结构组成特点及其相对短暂的发展历程来看,还存在很多问题需要作进一步的研究与分析探讨。本文针对目前自锚式悬索桥设计与施工计算时忽略主缆抗弯刚度的现状,以已建成的郑州桃花峪黄河大桥为主要工程背景,结合理论分析和有限元软件,通过选取合理的单元类型及其参数,进行考虑与不考虑主缆抗弯刚度的自锚式悬索桥力学行为与参数分析。本文主要研究内容有:(1)基于现有理论,利用有限元软件Midas Civil对背景工程进行成桥状态以及设计运营状态下的静力计算;(2)在定性分析考虑主缆抗弯刚度前后主缆、吊索、加劲梁、主塔等关键构件受力与变形特点的基础上,探讨不同简化假定条件下主缆受力与变形计算公式;借助有限元软件建立考虑主缆抗弯刚度的全桥有限元整体模型,分析比较考虑与不考虑抗弯刚度的自锚式悬索桥成桥及运营状态的力学特性;(3)通过倒退分析,建立考虑主缆抗弯刚度的梁单元模拟主缆条件下自锚式悬索桥的典型施工状态——空缆状态下主缆构件的纵向与竖向线形及无应力尺寸,并与索单元模拟主缆条件下的相应线形及无应力尺寸进行分析对比;(4)作不同参数组合条件下的受力分析对比,重点针对主缆抗弯特性值的不同大小进行计算分析,得到不同主缆抗弯特性值的条件下,关键构件的受力特性,并根据数值计算结果归纳总结其一般规律;(5)分析总结前述结论,并就目前的不足之处指出在今后的工作中需要着重加强的部分。
[Abstract]:At present, self-anchored suspension bridge has been paid more and more attention at home and abroad because of its good terrain adaptability and beautiful shape. Although the self-anchored suspension bridge has developed rapidly in recent years, there are still a lot of problems to be studied and discussed in the light of its inherent structural characteristics and its relatively short development process. In view of the present situation of neglecting the bending stiffness of the main cable in the design and construction calculation of self-anchored suspension bridge, this paper takes the completed Taohuayu Yellow River Bridge in Zhengzhou as the main engineering background, combining with theoretical analysis and finite element software. By selecting reasonable element types and parameters, the mechanical behavior and parameters of self-anchored suspension bridges with or without consideration of the bending stiffness of the main cable are analyzed. The main contents of this paper are as follows: (1) based on the existing theory, the static calculation of the bridge state and the design and operation state of the background engineering is carried out by using the finite element software Midas Civil, (2) the main cable, sling, stiffening beam before and after the bending stiffness of the main cable are taken into account in the qualitative analysis. On the basis of the stress and deformation characteristics of the main tower and other key members, the formulas for calculating the stress and deformation of the main cable under different simplified assumptions are discussed, and the whole finite element model of the whole bridge considering the bending stiffness of the main cable is established by means of the finite element software. The mechanical characteristics of self-anchored suspension bridge with and without considering flexural stiffness are analyzed and compared. (3) through retrogressive analysis, A beam element considering the flexural stiffness of the main cable is established to simulate the typical construction state of the self-anchored suspension bridge under the condition of the main cable, that is, the longitudinal and vertical alignment and the stress-free size of the main cable member under the condition of the empty cable. It is compared with the corresponding linear shape and non-stress size of cable element under the condition of simulating the main cable. (4) the stress analysis and comparison under the condition of different parameter combination are carried out, and the calculation and analysis are focused on the different magnitude of the bending characteristic value of the main cable. Under the condition of different bending characteristics of main cable, the stress characteristics of key components are obtained, and the general rules are summarized according to the numerical results. (5) the above conclusions are analyzed and summarized. At the same time, the paper points out the parts that need to be strengthened in the future work.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.25

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