多自应力模态索穹顶结构的几何构造分析

Geometrical construction analysis of cable dome with multi-selfstress modes

索穹顶结构是发展和推广 Fuller张拉整体结构思想后唯一实现的一种新型大跨空间结构 ,它的几何构造分析是一项非常重要的工作。本文在对一般空间杆件体系的分类、自应力模态和机构位移模态研究的基础上 ,从索穹顶结构特有的杆件拓扑关系入手 ,提出了单位整体可行预应力这一新概念 ,并最终解决了多自应力模态下该体系稳定性判定问题 ;通过对若干类型索穹顶结构的几何构造分析 。

Cable dome is a new type of long span structure which was realized by Geiger after developing Fuller's idea of tensegrity. On the base of studying the class of framework, determination of prestress and mechanism displacement model, the new conception of unit total feasible prestress is provided and the rule of stability is analyzed. Program has been developed to calculate different styles of cable domes and some useful conclusion is obtained.