大跨度公轨两用钢桁梁斜拉桥结构静力性能仿真分析.pdf

Simulation Analysis of Static Behaviors of Long-span
bined Highway and Railway Steel Truss
Cable-stayed Bridge


A Dissertation Submitted for the Degree of Master




Candidate:Yuan Ming
Supervisor:Prof. Di Jin




Chang’an University, Xi’an, China
摘要
随着轨道交通的发展,公轨两用钢桁梁斜拉桥得到了越来越广泛的应用。该类桥型
承受了较大的恒载和活载,其受力比公路斜拉桥更加复杂。本文以重庆红岩村嘉陵江大
桥为依托工程,运用空间有限元分析软件 MIDAS/CIVIL2010 建立基于梁单元、板单元
和桁架单元的全桥空间有限元模型,对桥梁结构静力性能进行了以下研究:
首先,选取最大双悬臂阶段、边跨合龙阶段以及成桥阶段这三个最不利施工阶段,
对施工阶段结构主桁、桥塔以及斜拉索的位移和受力进行分析,并检验了施工阶段结构
受力的合理性。
其次,在运营阶段考虑了汽车荷载、列车荷载、温度变化、风荷载和支座沉降作用,
计算分析了结构在各单独工况以及各种荷载组合工况作用下的受力和变形,并将计算结
果同相关规范进行了比较,检验了结构的承载能力。
最后,对影响公轨两用钢桁梁斜拉桥静力性能的荷载参数做敏感性分析,考虑结构
整体温度变化、基准风速值和支座沉降量,将参数控制在一定范围内变化,研究各参数
变化对结构受力性能的影响规律。
通过对大跨度公轨两用钢桁梁斜拉桥的静力性能进行仿真分析,总结归纳了该类桥
型的受力性能,并提出了需要做进一步研究的问题。

关键词:公轨两用钢桁梁斜拉桥;有限元模型;静力性能;参数敏感性分析









I
Abstract
With the development of the railway transport, bined highway and railway steel
truss cable-stayed bridge have been increasingly used. The dead loads of the first and second
phase of the bridge overweigh much than general highway cable-stayed bridge. Therefore, the
stress of bination bridge is much plicated than general bridge. This essay is
based on the bination of highway and railway bridge of Chongqing, using
the spatial finite element analysis software MIDAS/CIVIL2010. Space of the whole bridge
finite element model, which is based on the element of beam, plate and cable, is built to carry
out the following study on the static behaviors of long-span bined highway and
railway steel truss cable-stayed bridge:
Firstly, the three most unfavorable construction stages, which are the largest cantilever
system transformation, side span closure and finishing the bridge, are selected to analysis the
stress of structure of the main girder, bridge tower and the lasso. And the stress of the
structure in the construction stage is examined to be reasonable.
Secondly, considering t