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通过对某超高层写字楼进行测压试验,得到平均风压系数、脉动风压系数以及建筑表面的风压分布。研究了建筑表面的脉动风压在时域内的水平和竖向相关性系数、频域内的水平和竖向相干函数。采用Davenport提出的经典相干函数公式对脉动风压在频域内的相干函数计算结果进行拟合,得到相干性衰减系数,并与相关性系数进行对比,发现两者变化规律相似:除了背风面的相关性没有明显变化外,其他各面的相干性和相关性均随着高度增加而增加;侧风面的水平相干性和相关性从前缘至后缘逐渐减小。
Through the pressure test on a super high-rise office building, the average wind pressure coefficient, fluctuating wind pressure coefficient and the wind pressure distribution on the building surface are obtained. The horizontal and vertical correlation coefficients of fluctuating wind pressure on the building surface in the time domain and the horizontal and vertical coherence functions in the frequency domain are studied. By using the classical coherent function formula proposed by Davenport, the coherence attenuation coefficient of the fluctuating wind pressure in the frequency domain is fitted and compared with the correlation coefficient. The correlation between the two is similar except for the lee surface There was no obvious change in sex, but the coherence and relativity of other aspects increased with the height increasing. The horizontal coherence and correlation of crosswinds decreased gradually from the leading edge to the trailing edge.