Research for Suction Control on Roof Wind Pressure of Low-rise Building

International journal of structural and civil engineering research Pub Date : 1900-01-01 DOI:10.18178/ijscer.11.2.46-50

C. Qian, Changping Chen, Haitao Hu, Zhujun Li, D. Xia, Bifeng Liu

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Abstract

—With the application of boundary layer theory, the N-S equation in the boundary layer of the wall is simplified in this research. Combined with the boundary conditions, the relationship between the wall pressure gradient and the velocity gradient near the wall is obtained, therefore the roof pressure characteristics and the location of the separation point are analyzed. The rigid model of low-rise building with flat roof was fabricated. The combination of wind tunnel test and theory is utilized to analyze the distribution characteristics of roof pressure. The suction device is designed to complete the wind tunnel pressure test of the low-rise building model under active suction. The influence of the suction position on the roof wind pressure is studied, and the mechanism of the suction-to-wall turbulence control is proposed. Research results show that the arrangement of the suction device in the separation bubble area has a significant influence on the average wind pressure coefficient of the roof, which can greatly reduce the suction of the roof.

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低层建筑屋面风压吸力控制研究

-应用边界层理论，简化了壁面边界层的N-S方程。结合边界条件，得到了壁面压力梯度与壁面附近速度梯度的关系，从而分析了顶板压力特征和分离点位置。建立了平顶低层建筑的刚体模型。采用风洞试验与理论相结合的方法，分析了顶板压力的分布特征。该吸力装置是为完成主动吸力作用下低层建筑模型风洞压力试验而设计的。研究了吸力位置对顶板风压的影响，提出了吸力-壁面湍流控制的机理。研究结果表明，吸力装置在分离泡区布置对顶板平均风压系数有显著影响，可以大大降低顶板吸力。

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International journal of structural and civil engineering research

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