Effect of the combined aerodynamic control on the amplitude characteristics of wind loads on a tall building. (15th October 2021)

• Record Type: Journal Article
• Authors: Zheng, Chaorong; Wang, Zhaoyong; Zhang, Jitong; Wu, Yue; Jin, Zhao; Chen, Yong
• Is Part Of: Engineering structures. Volume 245(2021)
• Publication Date: 2021-10-15
• Subjects: Tall building -- Wind load -- Wind tunnel test -- Combined aerodynamic control -- Shape modification -- Air suction; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.112967
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A combined aerodynamic control, consisting of shape modification and air suction, is proposed to mitigate the wind loads on a tall building. Experimental investigation of the amplitude characteristics of wind loads on a tall building under combined aerodynamic control is conducted. Control effects of shape modification and suction flux coefficient on the wind pressure coefficients and aerodynamic force coefficients are analyzed. The combined aerodynamic control is proved to be more effective in mitigating wind loads than simple passive or active aerodynamic control. Abstract: Experimental investigation of the amplitude characteristics of wind loads on a square cross-sectional tall building under the combined aerodynamic control, which consists of the shape modification and air suction, has been conducted, and the effects of the suction flux coefficients C Q and wind direction angles on the wind pressure coefficients and aerodynamic force coefficients of five test models (includes a square cylinder and its corner modifications such as recession and chamfer, tapered cylinder and Y-shaped cylinder, and they are denoted as the Models 1–5 respectively) with and without air suction control have been analyzed. The Model 1 without suction control is defined as the benchmark model. The results show that the shape modifications have significant control effects on the mean and RMS pressure drag coefficients ( C D and C σD ) as well as the RMS pressure lift coefficient C σL of the Models 2, 3 and 5 at 0° wind direction, with the maximum reduction rates ( C DR, C σDR and C σLR ) of 39.2%, 44.0% and 38.4% for the Models 2, 5 and 2 respectively. When compared with the benchmark model, the most significant control effects of the combined aerodynamic control on C DR, C σD and C σL of the Models 2–5 with the suction speed of 9 m/s are also at 0° wind direction, with the maximum reduction rates of 61.8%, 65.8% and 5.7% for the Models 2, 2 and 5 respectively, which indicates that the combined aerodynamic control is more effective on the drag reduction than the passive or active aerodynamic control individually, and the Model 2 with suction control has the best wind-resistant performance. This study contributes to an effective aerodynamic measure to control the amplitude characteristics of wind loads on tall buildings, which can be an important reference for further studies or potential engineering applications of the combined aerodynamic control in mitigating the wind loads and wind-induced responses of tall buildings.