改进悬臂型张弦梁结构理论分析及试验研究

Theoretical and experimental study of an improved cantilever string structure

借鉴张弦梁结构(BSS)的构成原理,提出一种改进悬臂型张弦梁结构(CSS),并进行了理论分析和试验研究。通过向上、向下荷载作用下的结构静力和几何非线性分析,得知这种结构以承受轴力为主,并具有良好的稳定性和抵抗不对称荷载的能力。为验证这种新型结构的力学性能,设计了一个直径为5.4m的试验模型,并设计了支承部件、可调索杆、连接节点的制作方案,进而全面考察了索的初始预应力分布以及模型在满跨、半跨加载两种荷载工况下的静力响应。理论与试验研究结果表明,在这两种荷载工况下,模型的静力响应与理论分析结果基本吻合,改进悬臂型张弦梁结构(CSS)受力合理,是一种适于大跨悬臂屋盖的新型结构形式。

An improved cantilever string structure（CSS） is proposed using the construction principle of beam string structure（BSS） for reference.It is shown by theoretical analysis that the members in CSS are mainly axial force components and the CSS has good performances of stability and resisting asymmetry loads.To investigate the structural mechanical behavior,a model with the diameter of 5.4m is designed.The schemes of supporting parts,cables with adjustable length and connection nodes are presented.Then the initial pre-stress distribution and the static responses of the model under full-span load and half-span load are investigated.Theoretic and experimental results indicate that the responses of CSS experimental model are consistent with those of theoretical analysis.The cantilever string structure（CSS） is a new type structure with rational load-resist performances for large span cantilever roof structures.