作　　者： ; ;

机构地区： 同济大学土木工程学院土木工程防灾国家重点实验室

出　　处： 《建筑结构学报》 2014年第10期122-129,共8页

摘　　要： 基于同步测压技术,对阻塞度为4.1%、6.1%、8.4%和10.1%的矩形单体高层建筑模型在均匀风场中分别进行了阻塞效应试验研究。对比了各模型层脉动风力随高度的变化、层风力功率谱密度、相关性和相干性。研究结果表明:随着阻塞度的增大,层脉动阻力和升力系数均增大,升力系数增幅更为显著;层阻力功率谱在2倍斯托罗哈数处出现谱峰;层升力功率谱峰值更加突出,且斯托罗哈数有所增大;层升力的竖向相关性和相干性以及层阻力的竖向相干性均增强;而在建筑1/2高度以上的层阻力竖向相关性降低。 Blockage effects of isolated rectangular tall buildings whose blockage ratios are 4. 1%,6. 1%,8. 4% and10. 1% were respectively investigated in the uniform wind flow using the synchronous wind pressure measurement technique. Fluctuating forces along height and power spectral density,correlation and coherence of forces on each layer of models were compared. The results show that with the increasing of blockage ratio,fluctuating drag and lift of each layer increase,and the increase of fluctuating lift is more obvious. Peaks appear in power spectra of drag of each layer at the frequency which is two times of the Strouhal number. Peaks of lift power spectra are more prominent,and the Strouhal number increases. The correlation and coherence of lift of each layer increase as well as the coherence of drag of each layer. However,above half height of the building,the correlation of drag of each layer decreases.

关 键 词： 高层建筑 阻塞效应 脉动风力 功率谱 相关性 相干性

领　　域： [建筑科学]