摘要
对一组阻塞比为1.7%~10.9%的高层建筑标准模型在均匀低湍流强度风场和均匀高湍流强度风场中进行了多点同步测压试验,研究了不同风场下阻塞效应对高层建筑风致响应和等效静力风荷载的影响。结果表明:当阻塞比不大于4.5%时,可以忽略高层建筑风致响应和等效静力风荷载的阻塞效应;当阻塞比大于4.5%时,在均匀低湍流强度风场中,高层建筑的风致响应和等效静力风荷载均随阻塞比的增大而增大;在均匀高湍流强度风场中,湍流强度的增大不同程度地削弱了阻塞效应的影响。基于试验结果,提出了高层建筑顶部平均位移、位移均方根和加速度均方根的阻塞效应修正公式,可应用于修正等效静力风荷载,修正效果较好。
In order to investigate the influence of the blockage effects on the wind-induced responses and equivalent static wind loads(ESWLs)of tall buildings,the synchronous multi-pressure sensing system(SMPSS)has been adopted for measurement tests of a series of standard tall building rigid models with different blockage ratios(1.7%,3.1%,4.5%,6.3%,8.6%and 10.9%)in smooth and grid turbulence flows,respectively.Results show that the blockage effects have little influence on the wind-induced responses and ESWLs of standard tall buildingswhen the blockage ratio is less than 4.5%.However,when the blockage ratio is larger than 4.5%,the blockage effects have different degrees of influence on the wind-induced responses and ESWLs of standard tall buildings in the smooth flow.The increasing of turbulence intensity wakens the influence of the blockage effects in the grid turbulence flow.Based on the test results,correlation formulas for the blockage effects on mean displacement,RMS displacement and RMS acceleration at the top of tall buildings have been proposed,which can be applied to the blockage effects correction for ESWLs on tall buildings.
作者
李永贵
李茂杰
谭文俊
李毅
Li Yonggui;Li Maojie;Tan Wenjun;Li Yi(Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control,Hunan University of Science and Technology,411201,Xiangtan,China;School of Civil Engineering,Hunan University of Science and Technology,411201,Xiangtan,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2020年第4期1649-1655,I0018,I0019,共9页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51878271,51508183,51708207)
湖南省教育厅开放基金(15K044)。
关键词
阻塞效应
高层建筑标准模型
风洞试验
风致响应
等效静力风荷载
blockage effects
standard tall building model
wind tunnel tests
wind-induced response
equivalent static wind load
