某群体超高建筑的尾流激励效应及其减缓策略  

The wake excitation effect on a group of high-rise buildings and its mitigation strategies

作　　者：周子杰 石碧青[1] 谢壮宁[1] Zhou Zijie;Shi Biqing;Xie Zhuangning(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641

出　　处：《土木工程学报》2022年第9期17-24,77,共9页China Civil Engineering Journal

基　　金：国家自然科学基金(52078221)。

摘　　要：群体超高层建筑产生的尾流激励可能会明显增大下游建筑的结构风振响应而影响居住者的舒适性。文章以某位于华南海边的4栋高度在200m左右的超高层建筑群体为例,采用高频底座力天平方法对其中位于主导风向的上游建筑(T1和T2)对下游建筑(T3和T4)的风致干扰效应进行详细的风洞试验研究,分析了不同建筑相对布局以及建筑平面形状对尾流干扰效应的影响。结果表明:上游施扰建筑产生的尾流会使得下游受扰建筑加速度响应显著提高,相比单体情况,上游只有T2时可使T3和T4的峰值加速度分别增大167.2%和151.8%;逆时针旋转T3可以显著减小其峰值加速度,在旋转角度为18.5°时,10年和1年重现期峰值加速度比原布局分别降低了30.4%和64.4%;旋转上游T1的最佳工况可使T4的峰值加速度降低30.1%,但同时会增大T3的加速度响应;采用旋转T3和改变T4截面形状可以使得整个建筑群的风振加速度处于可接受和可进一步控制的范围。The wake excitation generated by high-rise buildings may significantly increases the wind-induced vibration response of the downstream buildings and affects the comfort level of occupants.Taking a group of 4 high-rise buildings with a height of about 200 m near the South China Sea as an example,this paper presents a detailed study of wind-induced interference effect between the upstream buildings(T1 and T2) and the downstream buildings(T3 and T4) in the dominant wind direction using the high-frequency-force-balance method.The influence of different relative layouts and sectional shapes of buildings on the interference effect was analyzed.The results show that the wake of upstream buildings will largely increase the acceleration response of downstream buildings.When there is only T2 upstream,the peak acceleration of T3 and T4 can be increased by 167.2% and 151.8% respectively compared with the case without interfering buildings.Rotating T3 counterclockwise can significantly reduce its peak acceleration,and especially when the rotation angle is 18.5°.The peak accelerations of the 10-year and 1-year return periods are 30.4% and 64.4% lower than that of the original layout case,respectively.The optimal working condition of rotating T1 can reduce the peak acceleration of T4 by 30.1%,but at the same time it will increase the acceleration response of T3.By rotating T3 and changing the sectional shape of T4,the wind-induced acceleration of the entire high-rise buildings can be brought into an acceptable and further controllable range.

关 键 词：群体超高层 风振舒适性 风洞试验 尾流激励 风振控制 

分 类 号：TU973.213[建筑科学—结构工程]