某大跨度网壳结构的稳定性分析

STABILITY ANALYSIS OF A LONG-SPAN LATTICED SHELL

  • 摘要: 稳定性分析是网壳结构,特别是单层网壳结构设计中的关键问题。该文以某大跨度球类馆为工程实例,采用非线性有限元法针对承载力计算时的11种工况进行整体稳定计算,考虑了材料和几何非线性,对实际工程进行了第一类和第二类稳定分析,其中,第二类稳定分析采用截面边缘纤维屈服准则,该文给出了两种典型工况的第一类稳定屈曲模态和两类稳定系数。结果表明:该网壳结构的第一类稳定符合相关规范的要求;其第二类稳定性较差。因此,第二类稳定分析应该受到重视。

     

    Abstract: The stability analysis is the key problem in the design of latticed shells, especially in single-layer latticed shells. A long-span ball gymnasium is adopted as a practical work, and it is analyzed by nonlinear finite element method under the first and the second kinds of stability problems. The holistic calculation aimed at 11 conditions in bearing capacity, material and geometric nonlinearity are considered. The second kind of stability is analyzed by the yielding criterion named the boundary edge fiber. The first kind of bucking modes and two kinds of stability factors under two typical conditions are given. The results show that the first kind of stability of this latticed shells accords with the requirements of correlative specifications; the second kind of stability is poorer. Therefore, the analysis of the second kind of stability should be paid attention.

     

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