文档介绍：华中科技大学
硕士学位论文
高墩大跨连续刚构桥稳定仿真分析
姓名:廖萍
申请学位级别:硕士
专业:结构工程
指导教师:李黎
20040315
摘要
随着大跨度桥梁结构迅速发展桥塔越来越高箱梁壁越来越薄由此导致了
桥梁的稳定问题非常突出特别是对高墩大跨度桥梁其稳定与强度具有同等的重
要性本文沪蓉国道湖北西段薄壁高墩大跨连续刚构桥龙潭河特大桥为工程背
景用大型有限元程序 ANSYS 研究了该桥的高墩稳定性龙潭河特大桥的最高墩
有 179m 是目前同类桥梁中的最高墩由此引起的高墩稳定性问题尤为突出
本文首先对目前桥梁结构稳定研究的现状及存在的问题进行了评述探讨了桥
梁结构两类稳定问题的基本理论研究了桥梁结构非线性有限元计算过程与计算方
法分别采用梁单元和壳单元建立龙潭河特大桥施工和成桥阶段的空间有限元模型
并分别对两种模型进行动力特性分析静力分析及线性稳定分析
其次针对日照对桥梁结构变形的影响采用热结构耦合分析的方法计算
该桥在单边日照下的偏位以此作为初始缺陷进行非线性稳定分析其中非线性
稳定分析包括几何非线性和双重非线性几何材料非线性稳定分析两个方面
在几何非线性方面采用
BIN39 多线性单元即多弹簧模型 MS 模型来模拟墩底塑性铰区
BIN40 双线性弹簧单元模拟墩底塑性铰以上两种非线性方程均
采用弧长法求解
最后对几何非线性和双重非线性的稳定分析结果进行了比较得出非线性因
素对于该桥稳定性的影响
通过全文的分析得到了对于该桥高墩设计十分重要的参数包括施工和成桥各
工况的临界荷载及稳定安全系数并提出了分析中还有待解决的问题
关键词刚构桥高墩稳定性非线性临界荷载
II
Abstract
With the development of the long-span bridge structure, more and more high strength
materials are put into application, bridge tower es dominant and the wall of the box
girder es much thinner. As a result, the stability of bridge es more important.
The bridge stability plays the same important role as the strength especially for high-pier
and long-span bridge. In this paper, an engineering case Long Tan He Great Bridge is
considered the bridge is a long span continuous rigid frame bridge with thin-wall
high-piers, built on Hu-Rong national highway in the west of Hubei province. The
stability of the high-piers is analysed by using the current FEM software ANSYS. Long
Tan He Great Bridge processes the highest pier at present, the stability problem of high
pier caused by this is particularly outstanding.
Firstly, the paper summarizes the investigation development on stability of bridges
with high-piers and some existing process; discuss two kinds of basic theories of stability
about bridge structure; further studies the nonlinear pution technique and
process of the nonlinear stability problem. By utilizing the current finite element program
ANSYS, two types of finite element m