【作者】 郭艳军；

【导师】 赵雷；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 主要从非线性有限元角度阐述了工程结构第二类稳定的求解方法、斜拉桥稳定性计算原则、稳定性判别准则及评价方法、材料本构关系的简化,提出了针对独塔混凝土斜拉桥稳定性计算的模型处理方法。以在建的泸州泰安长江大桥为工程背景,主要分析考虑几何非线性以及几何与材料双重非线性对稳定的影响。文章对结构施工过程中的最大双悬臂工况、边跨合龙工况、最大单悬臂工况、主跨合龙工况、二期恒载工况几个典型工况的稳定特点进行分析。在考虑其他影响斜拉桥稳定因素分析中,主要对最大双悬臂和最大单悬臂两个典型工况梁段的整个施工过程进行分析,对模型按设计坐标一次生成和考虑施工过程所计算出的稳定安全系数进行分析比较;对最大单悬臂阶段在各种几何非线性影响下稳定安全系数进行计算分析;考虑边界条件、双悬臂状态不对称施工、边跨结构形式、混凝土弹性模量的影响进行分析,得出相应结论。更多还原

【Abstract】 The methods of calculating the second kind of stability problems are expatiated using the nonlinear finite element method. The computational principle, judgement criterion and method of stability and the simplification of constitutive relation are illustrated. The model of the stability computation and the computational process of the stability case of the single-tower concrete cable-stayed bridge are proposed.Based on the Luzhou Taian Yangtze River Bridge, which is on construction, The stability of the construction in which considered the geometric nonlinearity only and considered both geometric nonlinearity and material nonlinearity is analyzed. The buckling configuration of the longest double cantilever stage, longest single cantilever stage and second term dead load stage are paid great attention to.considering the stability of the cable-stayed bridge other factors, The buckling configuration the entire construction process of the longest double cantilever stage, longest single cantilever stage are analyzed.The result of the modal generated by designed coordinates and the modal considering construction process are compared. The buckling configuration of the longest single cantilever stage in which considered the entire geometric nonlinearity is analyzed.Consider boundary conditions, asymmetric double-cantilever construction, and at the inter-structure, the elastic modulus of concrete impact analysis, the corresponding conclusions.更多还原