一类梁系结构线性稳定性分析的简化处理

本文给出了旋转壳与支承支柱系统组合结构线性稳定性分析的简化处理方案,即将空间梁系结构每根梁的单元刚度阵及几何阵按离散富氏系数变量叠加得等效刚度阵及几何阵。从所给算例知,这一简化处理是成功的,也说明稳定性分析反映的是结构的总体效应,局部区域的简化处理对整体结构临界载荷影响不大,但可使计算量大大减少。本文的计算方案及程序已应用于实际的冷却塔设计。

An approximate linear buckling analysis for a sort of beam system

An approximate method is developed for linear buckling analysis of cooling tower shell attached to a beam system. The generalized nodal displacements and forces of the beam system are approximately transformed into their harmonic series. Let the 2nd variation of total energy be equal to zero. Linearizing the resulting equations leads to generalized eigenvalue problem for linear buckling analysis. Good numerical results are obtained with less CPU time and data input. The developed theoretical analysis and computer program for personal computer have been used in practical design of cooling tower.