（华南理工大学建筑设计研究院，广州510640）

［提要］介绍了大跨度轮辐式双层预应力索网结构中环形支承构件的受力机理，并且从稳定计算的一般原理（边缘纤维屈服准则）出发，结合稳定系数和Perry Robertson公式之间的内在联系，提出用考虑结构二类初始缺陷的方法来近似计算刚性环形支承结构稳定性问题的近似算法。通过工程实例进行的模拟计算结果表明，当结果具有足够的刚度时，各种初始缺陷的影响相对于结构的准确初始状态而言并非很大，从而说明此类结构具有很强的自适应变形的能力。

［关键词］轮辐式；索膜结构；缺陷；稳定计算

Seond-order Design Method of Circuit Supporting Sub-structure of Wheel-spoke Cable-net Structure with Prestress/Sun Wenbo,Wang Jianwen,Liu Yonggui(Architect Design and Research Institute, SCUT, Guangzhou 510640,China)

Abstract:The mechanism of the circuit supporting sub-structure of double-decked large-span wheel-spoke prestressed cable-net structure is introduced. According to the basic principle of buckling analysis(yielding criterion of cross sectional edge stresses)，together with the connection between the stability coefficient and formula Perry Robertson, an approximate method considering two kinds of imperfections on the rigid supporting sub-structure is preferred to imitate the analysis of stability. In terms of the simulative calculating results of a constructing structure, the difference between accurate model and model with imperfection is tiny when the model is stiff enough. Consequently, it shows that this kind of structures have strong facilities in self-adapting distortion.

Keywords:wheelspoke; cablemembrane structure; imperfection; stability analysis