文档介绍：分类号:U44,U45
10710-2011221022

专业硕士学位论文

高墩大跨径连续刚构桥施工阶段
非线性稳定研究

苗茂成

导师姓名职称黄安录副教授
专业学位类别
申请学位级别工程硕士建筑与土木工程
及领域名称
论文提交日期 2013 年 5 月 10 日论文答辩日期 2013 年 6 月 6 日
学位授予单位长安大学
Nonlinear Stability Analysis of Long-Span
Continuous Rigid Frame Bridge with High Piers at
the Construction Stage

A Dissertation Submitted for the Degree of Master

Candidate:Miao Maocheng

Supervisor:Associate Anlu

Chang’an University, Xi’an,
China
摘要

随着交通事业的发展,薄壁高墩大跨径连续刚构桥修建的越来越多。但此类
桥梁的稳定问题,尤其是最大悬臂施工阶段的非线性稳定问题日益突出。本文以
洛河大桥为依托工程,利用有 Midas Civil 建立有限元模型,对该大桥最大悬臂
阶段 T 构的稳定性展开分析。
本文查阅了大量的文献资料,回顾了桥梁结构非线性有限元分析方法及桥梁
稳定理论,提出实际工程结构中的稳定问题多为第二类稳定问题。以洛河桥为例,
对成桥结构进行失稳计算和自振模态分析。并以该桥 13 号墩施工至最大悬臂状
态时为研究对象,在最不利荷载组合下进行线性稳定分析,得出最大悬臂状态时
可能出现的屈曲模态和自振频率。对最大悬臂结构进行了三种荷载工况下几何非
线性稳定分析得出三种工况下的失稳模态和稳定特征值,并通过荷载—位移曲线
得出各工况下的屈曲荷载和稳定安全系数;引入温度效应的影响作为初始缺陷,
并对结构进行时变非线性分析,为今后连续刚构桥的设计和施工稳定性提供参
考。

关键词: 薄壁高墩,大跨连续刚构桥,非线性,稳定性
I
Abstract

Along with the development of transportation, more and more long-span continuous rigid
frame bridge with high piers were , the stability problem of the bridge,
especially in the stage of cantilever construction is more remarkable. Based on Luohe Bridge,
the text analyzed the stability of continuous rigid frame bridge with high piers during the
construction of cantilever by use of finite element program Midas Civil.
The text consulted a large number of literatures, reviewed the nonlinear finite element
analysis method of bridge structure and the investigation development on stability of bridges
and the existing status, and the thesis indicates most stability problems in practical
engineering structure belong to the second type stability problem.; Taking Luohe bridge as the
example, analyzed the stability an natural vibration of the whole the largest
cantilever construction stage of 13th pier as a research ob