典型超高层建筑横风向气动力谱的构成分析

通过风洞试验得到典型超高层建筑的横风向脉动风荷载分布,将横风向脉动风荷载作用分解为横向紊流及旋涡脱落2种作用机理的共同作用,分析了横风向气动力谱的构成成分,并将分析结果与高频动态测力天平的结果进行了对比研究．结果表明:横向紊流对横风向气动力谱的贡献较小,而旋涡脱落激励对总横风向气动力谱的贡献较大;在不同风场中这些贡献量会发生改变．根据同步测压试验分解横风向气动力谱的方法可以清楚地解释超高层建筑横风向气动力谱的构成成分．

Amplitude Characteristics of Wind Pressure on Super High-rise Buildings

This article obtained the distribution of across-wind fluctuating loads on typical super high-rise buildings by simultaneous pressure measurement in wind tunnel tests, which was the result of combined function of lateral turbulence and wake excitation, and then analyzed the components of power spectra of across-wind loads. The comparison between the analysis result and those from another wind tunnel tests on the same building models using the high frequency force balance technique show that the contribution from the lateral turbulence to across-wind load is relatively small; while the contribution of the wake excitation is dominant in the across-wind loads. The contribution quantities will be varied in different terrain conditions. The present results can explicitly explain the composing mechanism of spectra of across-wind loads on super high-rise buildings.