文档介绍：华中科技大学
硕士学位论文
四渡河特大悬索桥静力非线性研究
姓名:陈伟
申请学位级别:硕士
专业:结构工程
指导教师:李黎
20060430
华中科技大学硕士学位论文
摘要
悬索桥是一种受力特点鲜明的桥型,它具有极强的跨越能力,是特大跨桥梁的
首选桥型。悬索桥是一种强非线性的桥梁,但是由于非线性计算复杂、工作量大,
目前设计计算时常采用线性方法。本文以沪蓉西第十六合同段四渡河特大悬索桥为
背景,对其进行了详细的线性和非线性的分析与比较,得出了一些可供工程设计参
考的结论。
首先本文介绍了悬索桥非线性分析的常用方法——CR 列式法,进而介绍了非
线性方程的基本求解方法——增量法、迭代法和增量迭代混合法。
然后采用悬索桥施工过程结构分析系统,建立平面有限元计算模型,充
分考虑了不同施工阶段桥梁的荷载和刚度的变化以及鞍座的变形和顶推因素,考虑
几何非线性的影响,得出了施工过程的各阶段和施工阶段结束时(成桥状态)主缆
的线形以及主缆系、主塔、吊杆、加劲梁的内力和位移,并分析了在竖向荷载作用
下悬索桥的内力、位移变化规律。
最后本文以成桥状态为初始状态,利用桥梁结构专用分析软件 Midas/Civil,建
立空间杆系模型进行整体分析计算,分析了在运营阶段汽车荷载、温度荷载、静风
荷载三种荷载对结构内力和位移的影响,并着重比较了在运营阶段按线性方法计算
和按非线性方法计算所得结果的差异,计算结果表明,在运营阶段本悬索桥已经有
了较大的刚度,非线性效应不明显。
关键词:悬索桥非线性施工阶段运营阶段
I
华中科技大学硕士学位论文
Abstract
Suspension bridge distinguishes from other kind of bridge for its unique mechanical
behavior, and it is the preferabale choice for long span bridges due to its great spanning
capacity. Suspension bridge is a strongly nonlinear structure while it is analyzed by a
linear method in engineering caculation because of plexity and large workload of
nonlinear analysis. This pares the results of nonlinear analysis in detail with that
of linear analysis, based on the Siduhe Rive Suspension Bridge of Shanghai-Chengdu
Expressway. Some conclusions are obtained, which are useful references for engineering
practice.
First, Co-rational method, mon method used in suspension bridge nonlinear
analysis, is introduced in this thesis. And the algorithms of the nonlinear equations
(increment method, iteration method bination of increment and iteration method)
are reviewed also.
Then, construction stage analysis is performed. A planar FEM model is established
with Suspension Bridge Construction Control system . The change of the system
stiffness and loads in variable stages is fully considered and the movement and
deformation of the saddles are taken into account. Nonlinear finite element method is
employed in construction stage analysis. The shape of the main cab