上部吸气控制下超高层建筑的平均风荷载特性研究  

Experimental Research on the Characteristics of Mean Wind Loads of High-rise Buildings Controlled by Upper-surface Suction

作　　者：郑朝荣[1] 任凯[1] 武岳[1] 冯畅达[1] 

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,哈尔滨150090

出　　处：《武汉理工大学学报》2015年第6期60-65,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51108142);中国博士后科学基金(2011M500672;2013T60377)

摘　　要：为减小超高层建筑的风荷载,改善结构的抗风性能,设计了一套吸气控制系统,完成了上部吸气控制下超高层建筑刚性模型的测压风洞试验,研究了不同风向角下吸气控制的几何参数和流量参数对模型的平均风荷载特性的影响规律。结果表明：吸气控制对吸气孔高度范围内的平均风压系数和层阻力系数的折减要显著大于非吸气控制段的风荷载折减;吸气流量系数CQ越大,吸气控制段的风荷载折减越显著,当CQ绝对值从0.004 57增大到0.017 4时,模型上部8~10层（吸气孔高度范围内）的层阻力系数最大折减值由0.094增大到0.231;在不同来流风向角下,吸气控制效果差异较大。因此,为实现吸气减阻,应根据建筑所在地的主导风向角确定最佳开孔方案。In order to reduce wind loads and improve wind-resistance performance of a super high-rise building,a suction control system was designed for implementing wind tunnel test of the super high-rise building model controlled by upper-surface suction.Based on the experimental results,effects of both orifice geometrical parameter and suction flux parameter on characteristics of mean wind loads of the model under different wind directions were analyzed.The experimental results show that reduction of the mean pressure coefficient and level drag coefficient within the suction-controlled zone are more significant than those are far away from the suction-controlled zone.Besides,reduction of wind loads in the suction-controlled zone is more significant under larger flux coefficient.And when absolute value of the flux coefficient is changed from 0.004 57 to 0.017 4,the level drag coefficient of the model＇s upper-surfaces could be increased from 0.094 to 0.231.Finally,effect of suction control is quite different under different wind direction,and the drag could even be increased in some directions.Therefore,the optimal location of suction orifice to acquire effective drag reduction should be determined by dominant wind direction of the on-site building.

关 键 词：超高层建筑 吸气控制 风洞试验 风荷载折减系数 

分 类 号：TU973.2[建筑科学—结构工程]