索穹顶结构的新形式及其初始预应力确定

索穹顶结构是美国工程师Geiger 根据Fuller 的张拉整体结构思想开发的一种新型预张力结构。现有的索穹顶结构形式主要有肋环型和联方型两种,并应用在不同的工程中。针对现有索穹顶结构形式存在的缺点提出了几种新型的索穹顶结构形式,并运用整体可行预应力概念对结构初始预应力进行了计算。算例分析表明杆件的正确分组是得到索穹顶结构整体平衡预应力分布的关键。本文的工作可以为该类结构的初始选型和设计提供依据。

NEW FORMS AND INITIAL PRESTRESS CALCULATION OF CABLE DOMES

The cable dome, proposed by Geiger after extending Fuller’s idea of tensegrity, is a new type of space structures. Two forms of cable domes have been applied into engineering projects by now. One is Geiger form and the other is Levy form. Considering the deficiencies in both forms, several new forms of cable domes are proposed in this paper. Based on the concept of integral feasible prestress, the initial prestress state of these domes are also calculated. Numerical results show that the proper grouping of members is the key point to obtain the correct initial prestress state. The present work may serve for the reference of initial design of cable domes.