外伸板对高层建筑横风向风致响应影响研究  

Effects of arrangements of facade appurtenances on crosswind response of high-rise buildings

作　　者：杨庆山[1,2] 娄泽辉 回忆 吴俊 YANG Qingshan;LOU Zehui;HUI Yi;WU Jun(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Chongqing's Key Laboratory of Wind Engineering and Wind Resource Utilization,Chongqing University,Chongqing 400045,China;Zhejiang Jiangnan Project Management Co.,Ltd.,Hangzhou 310013,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学风工程及风资源利用重庆市重点实验室,重庆400045 [3]浙江江南工程管理股份有限公司,浙江杭州310013

出　　处：《建筑结构学报》2023年第5期28-37,共10页Journal of Building Structures

基　　金：国家自然科学基金专项基金重点国际(地区)合作与交流项目(51720105005);国家自然科学基金面上项目(52078087);教育部、国家外国专家局111项目(B18062);重庆市科技计划项目科技人才培养计划(cstc2020yszx-jcyjX0007)。

摘　　要：高层建筑风荷载与风致振动是高层建筑抗风设计中的两个控制性因素。已有研究表明,外伸板可以有效降低结构风荷载,但其对结构风致振动的影响并未得到系统研究。选取6种不同的外伸板布置方案,分别开展刚性模型测压试验与气弹模型测振试验,针对布局不同的外伸板对高层建筑横风向风致响应的影响开展对比分析。结果表明:当折减风速不大于11时,外伸长度为7.5%B(B为建筑迎风面宽度)的竖直外伸板可使建筑的横风向位移标准差最多减小26%,外伸长度为12.5%B、相邻两层外伸板间距为8%H(H为建筑高度)的水平外伸板,能够使建筑横风向位移标准差最多减小37%;而当折减风速大于13时,外伸板反而会增大建筑结构的横风向风致响应,从而对建筑结构安全产生不利影响。对于采用外伸板的降载减振设计,当折减风速低于6时,气弹效应对建筑结构横风向风致响应基本没有影响;当折减风速介于6~11之间时,气弹效应能够进一步抑制横风向风致响应;而当折减风速大于13时,气弹效应会引起明显的气动负阻尼,加剧横风向风致响应。The wind load and wind-induced response are two vital factors in the design of high-rise buildings.Previous research shows that facade appurtenances can reduce the wind load on the structure,but there is little research on how they affect the wind-induced response of the structure.In this study,how facade appurtenances affect the crosswind response of high-rise buildings were analysed by pressure measurement wind tunnel tests and single-degree-of-freedom rocking-vibration model tests.The results show that when the reduced wind speed is not over 11,the vertical plates whose extensional depth is 7.5%B(B is the width of the building)can reduce up to 26%of the standard deviation of the crosswind displacement of the building,and the horizontal plates whose extensional depth and vertical separation are 12.5%B and 8%H(H is the height of the building)respectively can reduce the standard deviation of the crosswind displacement of the buildings by up to 37%.By contrast,when the reduced wind speed is over 13,the facade appurtenances may increase the displacement of the building structure,which can have negative effects on the safety of the building structure.The results also illustrate that when the reduced wind speed is under 6,the aeroelastic phenomenon can be neglected;when the reduced wind speed is between 6-11,the aerodynamic damping caused by the aeroelastic phenomenon can reduce the crosswind response of the structure;and when the reduced wind speed is over 13,the crosswind response of the structure can become larger due to the negative aerodynamic damping caused by the aeroelastic phenomenon.

关 键 词：高层建筑 外伸板 刚性模型测压试验 气弹模型测振试验 风致响应 

分 类 号：TU973.213[建筑科学—结构工程]