蘑菇形悬挑屋盖风洞试验研究  

Wind Tunnel Test on a Mushroom-Type Cantilevered Roof

作　　者：叶高宏 赵仕兴 金波 阳升 余志祥[1] 赵雷[1] YE Gaohong;ZHAO Shiring;JIN Bo;YANG Sheng;YU Zhiriang;ZHAO Lei(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Provincial Architectural Design and Research Institute Co.,Ltd.,Chengdu 610095,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]四川省建筑设计研究院有限公司,成都610095

出　　处：《建筑钢结构进展》2023年第6期68-74,共7页Progress in Steel Building Structures

摘　　要：以海口“雨林之心”项目为背景,针对其蘑菇形悬挑屋盖,采用1∶40大比例尺刚性模型,开展了大型风洞试验,得到其平均风压系数和脉动风压系数,并以此分析了该结构屋盖的风压分布规律以及脉动风特性;进而给出屋盖的分块体型系数,可直接用于屋盖结构抗风设计;最后就地形对风荷载的影响进行分析。试验结果表明:该蘑菇形悬挑屋盖在风荷载作用下整体受到向上的风吸作用;3个建筑间存在较强的相互影响作用;屋盖悬挑边缘位置在来流的直接撞击下,对风荷载较为敏感,呈现为较大的风压变化梯度和较大的脉动风压;A、C建筑处于迎风侧时,由于山坡对流场的影响,悬挑迎风侧的风荷载相较B建筑更不利。针对以上问题,在设计时应重点关注。Based on the project of the Heart of the Rainforest in Haikou,a wind tunnel test was carried out on a l:40 scaled rigid mushroom-type cantilevered roof.The mean and fluctuating wind pressure coefficients were obtained,and the wind pressure distribution and fluctuating wind characteristics of the roof were analyzed.Then the corresponding block shape coefficients of the roof were proposed,which can be used in the wind-resistant design of roof structures.Finally the influence of terrain on wind load was analyzed.The results show that the mushroom-type cantilevered roof is subjected to upward wind suction and overturning under wind load.The interaction among the three buildings is strong.The edge of the roof is sensitive to wind load due to flow separation,and this presents a large wind pressure gradient and a large fluctuating wind pressure.Cantilevered edge of building A and C have more unfavorable wind load than B when the building is on the windward side due to the influence of hillside on convection field.The above behaviors need special attention in the future design.

关 键 词：悬挑屋盖 风洞试验 平均风压 脉动风压 体型系数 

分 类 号：TU312.1[建筑科学—结构工程]