大跨度屋盖结构的多级抗风设计

Multi-levels wind-resistance design methods of large-span roof structures

结合风灾破坏的实地调查结果,对我国荷载规范中基本风压的取值规定进行了探讨;借鉴建筑抗震设计标准和规范,提出适合于大跨度屋盖的多级抗风设防标准和设计方法,并结合北京奥运乒乓球馆屋盖结构进行了抗风分析,得到的主要结论是:基本风压的取值决定了建筑物抗风设防的标准;现行规范中我国部分地区的基本风压取值有所偏低;对于大跨度屋盖结构而言,可以引入抗震设计思想和方法,进行多级抗风分析与设计。最后探讨了一些适合大跨度屋盖的抗风概念设计方法,以供设计和建造时参考。

Based on field investigations of the large-span roofs＇ damage, the main factors affecting the wind-resistance capability of large-span roofs are analyzed and the basic wind pressures provided by Chinese Load Code are discussed. Using the earthquake-resistance criterion and code for reference, the wind-resistance design methods and multi-criterions are proposed, which is applied for the Peking Olympic Game ping pong gymnasium roof structure. The problems about design and construction of large-span roofs are analyzed and discussed. Several conclusions are made as follows： The wind-resistance protected standard of buildings is determined by the value of the basic wind pressures. The basic wind pressures provided by Chinese Load Code are lower than practical values in some regions. As for large-span roof structures, the multi-levels wind- resistance analysis and design is feasible and effectual. The conceptual design methods are proposed and the results indicated in this paper may be useful for future design and construction.