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提出了一种新型球面网壳,它由投影为四边形平面的六杆四面体单元集合组成,网壳的成形构造简单,便于工业化预制生产和装配化施工.这种杆件数和节点数相对较少、网格抽空的球面网壳,也能发挥双层网壳的作用.文中给出并讨论了新型球面网壳的基本结构体系和加强结构体系.为提高结构的刚度和稳定性,网壳的上、下弦节点可采用刚接节点、半刚接半铰接节点和铰接节点,可形成四种节点布置方式和杆件特性,即四种不同计算模型的球面网壳.本文作了竖向荷载作用下的受力特性分析,获得了基本与加强结构体系、四种节点布置方式的网壳内力、位移的基本规律和相互差异,为工程设计和结构选型提供了依据.
A new type of spherical reticulated shell is proposed, which consists of a collection of six-rod tetrahedron elements projected into a quadrilateral plane. The reticulated shell has a simple structure and facilitates the industrial prefabrication and assembly construction. The number of such rods and nodes is relatively small , The spherical grid shell evacuated by the grid can also play the role of double reticulated shell.The basic structural system and strengthening structural system of the new spherical reticulated shell are given and discussed in this paper.In order to improve the rigidity and stability of the structure, For the upper and lower chord nodes, four types of node arrangement and rod characteristics can be formed, ie, four kinds of different reckoning models of spherical reticulated shells, Under the stress characteristics analysis, the basic regularities and mutual differences of the internal forces and displacements of the reticulated shell with the basic and reinforced structure system and the four kinds of node arrangement are obtained, which provide the basis for engineering design and structure selection.