凹角与吸气控制下高层建筑平均风荷载特性试验研究  

Experimental investigation on characteristics of mean wind loads of high-rise buildings controlled by corner recession and air-suction

作　　者：郑朝荣[1] 张继同 张智栋[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,黑龙江哈尔滨150090 [2]山东同圆设计集团有限公司,山东济南250101

出　　处：《建筑结构学报》2016年第10期125-131,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(51108142);中国博士后科学基金特别项目(2013T60377)

摘　　要：为减小高层建筑的风荷载,改善其抗风性能,基于等高度等体积的原则,设计了刚性基准模型、凹角模型和凹角吸气模型等三种高层建筑模型,通过对三种模型的同步测压风洞试验,研究风向角和吸气流量系数C_Q对模型平均风荷载特性的影响规律。结果表明：不同风向角下,三种模型的平均风荷载特性差异较大;在0°~35°风向角范围内,凹角与凹角吸气模型均有助于减小顺风向风荷载,且0°风向角（模型表面与风向垂直）时控制效果最佳。吸气流量系数绝对值越大,吸气控制区域各表面的风压折减越显著,整体/层气动力折减效果越好。当C_Q=-0.035 7时,整体气动力系数折减最大达62%,表明凹角与主动吸气控制结合具有良好的风荷载减阻效果。In order to reduce wind loads and improve the wind-resistant performance of high-rise buildings,three rigid high-rise building models,including a baseline model with the square cross-section,a corner recessed model,and a corner recessed and air-suction controlled model,were made based on the principle of the same-height and samevolume,and then experimentally investigated by the wind tunnel test method to study the influences of wind direction and suction flux coefficient CQon the characteristics of mean wind loads. The results show that the characteristics of mean wind loads for the three models are quite different from each other under various wind directions. Both the corner recession and the air-suction are very effective on reducing the along-wind loads of the high-rise building under the wind direction of 0° ~ 35°,and their control effects are the optimal under the wind direction of 0°. For the suctioncontrolled models,with increasing increments of the absolute value of suction flux coefficient,the mean pressure reduction on surface of the models becomes more significant,and the reduction of the overall / level aerodynamic forces also increases more rapidly. The maximum reduction of the overall aerodynamic coefficient is about 62% under the dimensionless suction flux coefficient of- 0. 0357,indicating that the combination of corner recession and air-suction is an effective technique to reduce the mean wind loads on high-rise buildings.

关 键 词：高层建筑 凹角 吸气控制 风洞试验 风荷载减阻 

分 类 号：TU973.213[建筑科学—结构工程]