摘要
对阻塞度为4.1%、6.1%、8.4%和10.1%的CAARC高层建筑标准模型在均匀风场中分别进行了测压试验,对比了各模型表面测点风压系数的根方差、功率谱、空间相关性和相干性,总结了矩形单体高层建筑脉动风压阻塞效应的主要规律,并从流场方面来解释。阻塞效应对模型绕流和尾流产生约束,改变了旋涡脱落形式,影响了建筑表面易产生分离、涡脱处的根方差脉动风压系数;建筑表面风压系数的功率谱、空间相关性和相干性也发生变化。
Pressure measurement tests of CAARC standard models of tall buildings with blockage ratios of 4.1％,6.1％,8.4％ and 10.1％ were performed,respectively in a uniform flow.Root-mean-square,power spectrum and spatial correlation and coherence of each pressure coefficient on surfaces of each building model were compared.The main laws of blockage effects of fluctuating pressures on a single rectangular tall building were summarized and explained from the flow field.The results showed that the blockage effects not only restrain flows around and behind the building,change the patterns of vortex shedding and influence the root-mean-square of fluctuating pressure coefficients of surfaces where vortex-separating and vortex-shedding are easy to appear,but also change power spectrum,spatial correlation and coherence of pressure coefficients on building surfaces.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第12期28-34,41,共8页
Journal of Vibration and Shock
基金
国家自然科学基金重大研究计划项目(91215302
90715040)
关键词
高层建筑
阻塞效应
脉动风压
功率谱
相关性
相干性
tall building
blockage effect
fluctuating wind pressure
power spectra
correlation
coherence
