连拱式大跨悬挑屋盖抗风气动措施研究

本文对连拱式大跨度悬挑屋盖进行了数值风洞试验，分别探讨了在屋盖悬挑前缘增设通风孔、导流板以及同时布设导流板与通风孔这三种气动措施对悬挑屋盖表面风荷载的影响及其作用机理．研究结果表明，同时布设导流板与通风孔的综合气动措施，能显著影响屋盖结构前缘气流的分离，从而减小屋盖的表面风压，并可减弱屋盖的风致振动．在此类屋盖结构设计中，运用综合气动措施可有效降低屋盖整体的升力系数与弯矩系数，对该类屋盖抗风设计较为有利．

Study on Pneumatic Measures of Continuous Cantilevered Roof

The numerical wind tunnel test was carried out for the multi-arch long-span cantilever roof, to study the influence of three aerodynamic measures, i.e., adding an air deflector, adding an aspirail, and simultaneously arranging an air deflector and an aspirail, on the wind load and action mechanism of the cantilever roof. The results show that the separation of air flow at the leading edge of the roof can be significantly affected by the integrated aerodynamic measures, which can reduce the wind pressure on the roof surface and reduce the wind-induced vibration of the roof. In the structural design of this kind of roof, the use of comprehensive aerodynamic measures can effectively reduce the overall lift coefficient and bending moment coefficient of the roof, which is beneficial for the wind resistant design of this kind of roof.