周边高层建筑对大跨度曲面屋盖的气动干扰

结合无锡新区科技交流中心的风洞试验,分析了有无周边建筑两种情况下的风压分布,并对梅花形屋盖的花蕊、花瓣凹弧面和花瓣凸弧面3个典型部位的风荷载体型系数进行了研究,获得周边高层建筑对大跨度曲面屋盖气动干扰的相关结论:虽然受扰建筑的最不利风向角和风压发生很大变化,但是最危险部位始终处于檐口附近,而且是负风压为主;在"兜风效应"的作用下,受扰建筑的风压会急剧增大;在"阻挡效应"的作用下,受扰建筑的风压存在由负压向正压变化的趋势;屋盖凹弧面的槽向与风向角一致时,存在涡流作用与"兜风效应"叠加的现象,受"吸"破坏力极大,在曲面屋盖设计中应予以重视。

AERO-INTERFERENCE OF SURROUNDING HIGH RISE BUILDINGS ON LARGE-SPAN CURVED ROOF

Based on wind tunnel test of Wuxi New District Science and Technology Communication Center,the wind pressure distribution was analyzed under the condition of with and without surrounding buildings.Moreover,the shape coefficients of three typical regions of the plum-blossom-shaped roof were studied.Several conclusions about aero-interference of surrounding high-rise buildings on large-span curved roof were provided.Although the most disadvantageous wind direction and wind pressure have changed while aero-interference occurred,the roof of the interfered building still mainly bear negative wind pressure and the most fragile location is still along eaves.Wind pressure of the interfered building is acutely increased under the action of wind-catching effect.Wind pressure of the interfered building changes from negative to positive value under the action of wind-obstructing effect.The concave of roof will bear the greatest sucking load when the direction of its trough is identical to wind direction because eddy currents cooperate with wind-catching effect,which should be focused in the design of the curved roof.