随着科学技术的发展和施工工艺的进步,各种外形美观、结构新颖的大跨度空间结构得到了广泛的应用。这类结构往往对风荷载十分敏感,其屋面几何形状对表面风压分布有着重大影响。不同形式的屋面,表面风压分布有很大区别;即使屋面整体形式相同,但由于其矢跨比(f/D)、长跨比(L/D)等几何参数的不同,也会使屋面风压分布发生较大变化。对此,目前尚无详细规范可依。本文回顾了几类典型空间结构的风洞试验,总结了这几类结构的屋面几何形状与风压分布之间的变化规律,为大跨空间结构风压分布规律确定及气动优化设计研究提供参考。
With rapid development of the science and technology in structural design and construction methods,many kinds of large-span spatial structures are becoming more and more widely used due to their attractive appearance and creative structural system.However,such kinds of structures are often very sensitive to wind action,and the geometrical parameters of the roofs may have fundamental effect on the wind pressure distribution on their surfaces.Even if the basic shape is the same,the local or even overall distribution of wind load may be greatly different with the change of the rise-span ratio(f/D),length-span ratio(L/D),as well as the wind attack angle of approach flow.For these differences,there is no related provision in details in the codes used currently in China.In this paper,a series of the finished wind tunnel tests for several typical kinds of large-span roofs are reviewed and discussed,and the relationship between the geometry parameters of the roofs and the wind pressure distributions are summarized,which can be referred to further investigation on wind pressure distribution of other spatial structures and even their aerodynamic optimization design in the near future.