大跨屋盖风荷载的频域特性试验研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 111-117.

论文

大跨屋盖风荷载的频域特性试验研究

陈伏彬1; 李秋胜1，2; 傅继阳3; 谢壮宁4

作者信息 +

Experimental investigation on frequency domain characteristics of wind loads on long span roof structure

Chen Fu-bin1; .Li qiu-sheng1,2 ; Fu ji-yang3 ； Xie Zhuang-ning4

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摘要

在大气边界层风洞中通过模拟大气边界层风场对广州国际会展中心模型进行测压试验，获得了测点的在36个风向角下的风荷载。对风荷载的功率谱、相关系数、相干函数进行了细致分析，讨论了风场对脉动风压频域特性的影响。得出一些结论：脉动风压功率谱表现很强的漩涡脱落特征，其斯脱罗哈数约为0.295；测点风压相关系数横风向强于顺风向，均随着测点间距的增大而减小，并且边缘区域测点的相关性高于中间区域测点；测点风压的相干系数随着测点距离的增大而减小，且顺风向高于横风向。

Abstract

A experiment study of wind pressure distributions on the Guangzhou International Convention & Exhibition Center has been carried out in a Boundary Layer Wind Tunnel. The Mean and Fluctuating wind loads in 36 wind directions were obtained from the wind pressure measurements. Then the power spectral densities, correlation coefficients and coherence functions are analyzed in detail. The influence of approaching wind on frequency domain characteristics of wind-induced pressures is discussed. The observations can be summerized as follows. The power spectral densities of fluctuating wind load have the characteristics of vortex shedding and the Strouhal numer is about 0.295; The across-wind load correlation coefficients are stronger than those of the along-wind, All of them decreased when the space of the measuring points increase, And the correlation coefficients at the edge points are stronger than those in the middle area; The coherence coefficients decrease when the space of the measuring points increase, And the along-wind loads coherence coefficients are greater than those of the across-wind loads.

导出引用

陈伏彬;李秋胜;傅继阳;谢壮宁 . 大跨屋盖风荷载的频域特性试验研究[J]. 振动与冲击, 2012, 31(5): 111-117

Chen Fu-bin;.Li qiu-sheng;;Fu ji-yang;Xie Zhuang-ning . Experimental investigation on frequency domain characteristics of wind loads on long span roof structure[J]. Journal of Vibration and Shock, 2012, 31(5): 111-117