Wind tunnel test studying on roughness index of complex urban sites

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (5) : 149-154.

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Wind tunnel test studying on roughness index of complex urban sites

ZHOU Wenjun1, ZHENG Shixiong2, ZHU Donghong1, SHEN Guohui*2

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Abstract

Wind tunnel tests were conducted on a complex urban landform to obtain the mean wind velocity profile of 24 wind directions and fit the roughness power index to determine the ground roughness categories for each wind direction angle. Meanwhile, the influence of the upwind sector angle on the test results was investigated. The results indicate that upwind areas with mixed urban and mountainous landforms are more likely to develop into Category C landforms. The goodness of fit of the roughness power index values for 24 wind directions is greater than 0.95, indicating that the exponential law can effectively express the mean wind velocity profile of complex urban landforms. The upwind sector angle has a significant impact on the classification of urban ground roughness. The average wind speed profile and fitted power index are very close when the sector angle is between 70°and 180°, while the index decreases when the angle is between 30°and 60°. It can be determined that the minimum angle of the upstream sector is 70°, which is close to the 90° specified in ASCE and EN specifications. The upstream sector value of 180°, which is equal to a semicircle, regulated in the Load Code for the Design of Building Structures, seems to be too large.

Key words

exponential law / terrain roughness / wind tunnel test / wind angle / upwind sector angles

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ZHOU Wenjun1, ZHENG Shixiong2, ZHU Donghong1, SHEN Guohui2. Wind tunnel test studying on roughness index of complex urban sites[J]. Journal of Vibration and Shock, 2025, 44(5): 149-154

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