大跨度拱式曲折型输水管的稳定分析

Structural Stability Analysis of Long Spanned Water Pipelines in Folded Arch Shape

本文用有限单元法和近似法,解决了由圆管加焊槽钢所组成的具有双对称轴的三闭室截面构件建造而成的大跨度折拱式输水管的稳定分析问题。导出上述三闭室构件的圣维南扭转常数和剪切变形截面形状系数的表达式,以供计算使用。并根据多种不同设计方案的分析比较,提出提高这种输水管整体稳定性所可采用的具体措施。

In this paper the problem of structural stability analysis of a long spanned water pipeline in folded arch shape has been solved by means of the finite element method and art approximate method. The pipeline is constructed of members, which are welded pipes and channel bars, with three cells and two symmetrical axes in its section. The formulae of St. Venant torsion constant and the section shape coefficient of shear deformation about the previous members are developed and they can be used in calculations. Some specific adoptable measures are developed, with a comparison made among different design schemes, in order to advance the structural stability of the pipeline.