【摘要】 提出了一种变边界约束结构分析的有效方法,导出了静力分析的扩充矩阵,建立了相应的非线性有限元方程,提出了用于变边界约束结构分析的强制约束法计算策略和整体稳定计算方法.作为工程实例,对采用这种设计理念的国家大剧院网壳结构进行了分析计算及比较,总结出该结构体系的优点,验证了方法的有效性.更多还原

【Abstract】 This paper presents an efficient computation method for analysis of structures with changed restrained boundaries in different stages.An expansion matrix is derived for the linear analysis.Nonlinear finite element equations are established considering geometric nonlinearity.A new compelling constraint computation technique and buckling analysis method are proposed.A case study is conducted on the loading behavior of the reticulated shell roof of the National Grand Theatre of China to verify the method in the paper.The characteristics and the advantages of the changed boundaries of the structure are concluded.更多还原