六杆四面体双曲扁网壳的构形及受力性能分析

Configuration & Mechanical Performance Analysis of Hyperbolic Flat Latticed Shells Composed of Six-bar Tetrahedral Units

摘要:

提出了由六杆四面体单元组成的新型装配式双曲扁网壳结构，介绍其基本结构体系，并结合边界条件讨论加强结构体系及周边索桁架加强体系的结构构形。对周边支承条件下的正交斜放型和正交正放型双曲扁网壳结构进行静力分析和稳定性分析，考察结构受力性能，分析中考虑全刚接和部分刚接部分铰接两种杆件连接形式。进一步研究结构参数变化对网壳结构静力性能和稳定性能的影响，为结构选型和工程设计提供依据。结果表明：周边支承的六杆四面体双曲扁网壳结构具有良好的受力性能；正交斜放型结构的稳定性优于正交正放型结构，部分刚接部分铰接的杆件连接形式对结构稳定性有一定削弱；结构的跨度、矢高和网格参数的变化对结构静力性能和稳定性能均有不同程度的影响；结构的厚度对结构稳定性能有一定影响，但对结构静力性能影响很小。

Abstract:

A new prefabricated hyperbolic flat latticed shell composed of six-bar tetrahedral units was presented. The basic structure was introduced， followed by a discussion on the configurations of the reinforced structure and the peripheral cable truss reinforced structure considering boundary conditions. Static analysis and stability analysis were carried out on the diagonal and orthogonal hyperbolic latticed shells with the peripheral support， considering fully or partially rigid connection of members. The influence of structural parameters on static and stability properties of the latticed shell was further studied to provide suggestions for the structure selection and engineering design. The results show that the six-bar tetrahedral hyperbolic latticed shell with peripheral support has good mechanical properties. The stability of the diagonal structure is better than that of the orthogonal structure， while the partially rigid connection weakens the stability of the structure. The span， height and mesh parameters of the structure have different effects on the static and stability properties of the structure. The thickness of the structure has more significant effect on the stability of the structure than the static property.