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（華南理工大學建筑設計研究院，廣州510640）

［提要］介紹了大跨度輪輻式雙層預應力索網結構中環(huán)形支承構件的受力機理，并且從穩(wěn)定計算的一般原理（邊緣纖維屈服準則）出發(fā)，結合穩(wěn)定系數(shù)和Perry Robertson公式之間的內在聯(lián)系，提出用考慮結構二類初始缺陷的方法來近似計算剛性環(huán)形支承結構穩(wěn)定性問題的近似算法。通過工程實例進行的模擬計算結果表明，當結果具有足夠的剛度時，各種初始缺陷的影響相對于結構的準確初始狀態(tài)而言并非很大，從而說明此類結構具有很強的自適應變形的能力。

［關鍵詞］輪輻式；索膜結構；缺陷；穩(wěn)定計算

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