弦支穹顶初始预应力分布的确定及稳定性分析

Distribution of initial pre-stress and stability analysis of suspen-dome

弦支穹顶结构体系是基于索杆张力体系和单层网壳而形成的一种新型杂交空间结构体系.本文对这种结构的初始预应力确定方法及其稳定性能进行了深入的理论研究.提出并采用了基于将结构分块的分析方法——局部分析法,并结合弦支穹顶的拓扑关系对初始预应力分布的确定进行了简化.针对联方网格型弦支穹顶结构进行了静力稳定性能分析,结果表明同单层网壳相比,尽管其用钢量增加了近30%,但其极限载荷却提高了266%,结构体系更加合理,具有很好的应用前景.

Suspen-dome is a new hybrid space structure, composed of cable-strut tensile structure and single reticulated shell. In this paper, the initial pre-stress distribution and the static stability of suspen-dome was analyzed. A new method named local analysis method is first presented and adopted where the whole structure is divided into two parts: the upper structure and the lower structure. Combining the topological relation of suspen-dome, it can be used to simplify the distribution of initial pre-stress. Then the static stability of this kind of structure was investigated by the geometrical nonlinear finite element method. Compared to the single reticulated shell, although its steel quantity increases by 30 percent, its critical load improves 266 percent. And the structural system of suspen-dome is more rational and has a very good applied perspective.