茅草街大桥模型试验与受力性能分析-桥梁与隧道工程专业毕业论文.docxVIP

摘要随着钢管混凝土系杆拱桥修建的兴起，其在施工过程中与成桥阶段的静力分 摘要 随着钢管混凝土系杆拱桥修建的兴起，其在施工过程中与成桥阶段的静力分 析与稳定分析受到越来越多的关注。因此，开展对大跨度钢管混凝土拱桥的静力 分析与稳定性分析研究具有重要的理论意义和工程价值。 本文首先总结了国内外学者在钢管混凝土拱桥静力分析与稳定性分析方面 的研究成果，通过将ANSYS中的“单元的生死技术”以及结构的几何非线性引 入到拱桥空钢管合龙后施工阶段的正装仿真分析，从而使仿真分析得以简化，精 度得以提高。接着以湖南省益阳茅草街大桥模型试验为工程背景，建立了该桥的 有限元模型。通过对空钢管合龙后施工阶段与成桥状态静载试验所采集的试验数 据与仿真分析结果的对比，验证了仿真分析的正确性并且得出了一些规律性结 论。 然后简单阐述了钢管混凝土拱桥的稳定理论，运用线性屈曲分析方法对施工 过程于成桥运营阶段进行了稳定性分析，并讨论了施工过程中保留扣索对结构于 稳定性的影响。在对稳定性最差的成桥运营阶段进行了几何非线性与双重非线性 分析后，求出了在极限承载力分析中必须考虑双重非线性的必要性和重要性的结 论， 最后通过三种稳定性分析方法，对加载方式与风荷载对于结构极限承载能力 的影响进行了探讨，并得出了相关结论。 关键词：钢管混凝土拱桥；模型试验；空钢管合龙后的旋工阶段：静 力分析： 稳定极限承载力 AbstractWith Abstract With the rapid development of long-span concrete—filled steel tubular tie·-arch bridge，the static analysis and the stability analysis in construction stage and on the completion arc paid to more and more attention．Therefore，the research on the static analysis and the stability analysis of concrete—filled steel tubular tie·arch bridge has great engl’neering value and theory significance． In this thesis，the research resuIts of domestic and over．as scholars on static and stability of Concrete—Filled Steel-Tube Arch Bridge are roundly summarized．The technique On birth and death of element in ANSYS and geometrical nonlinear are applied to Forward-simulation analysis，as a result the simulation analysis be(：0mes more simple and accurate．Then on the basis of model of MAOCAOJIE Bridge of NANXIAN Country in HUNAN Province，the finite element model is constructed． The test dates which are collected from construction stage after steel tube closed and the static loading test are contrasted and analysed with the simulation analysis．As a result，it proves that the simulation analysis is accurate and gets a some regulation conclusion． Then the stability analysis theory is simpliedly introduced．The linear elastic stability analysis is applied theory to analyz the stabiltiy capacity of construction and completed stage and analyzs the effection on stability analysis if the cables are