Effects of twisted wind flow on the mean wind load characteristics of super high-rise buildings with different heights

Abstract

The phenomena of wind veering are frequently observed in the atmospheric boundary layer, and their influences have gradually attracted attention in the evaluation of wind effects of super high-rise buildings. However, most studies only focus on buildings with a certain height, and the wind load characteristics of buildings with different heights under twisted wind flows (TWFs) are not clear. This paper investigates the wind veering effects on mean wind load characteristics of square cross-sectional super high-rise buildings with different heights (1000 m, 800 m, 600 m) via wind tunnel test under TWFs. The mean wind pressure and aerodynamic force characteristics of three models under TWFs with different wind twist angles are analyzed, and the effects of wind twist angles on the aerodynamic forces and deviation phenomenon (including amplitude shift and angle shift) are discussed in detail. Finally, the effects of wind twist angle on amplitude and angle shifts in the longitudinal, lateral, and torsional directions are quantified, and the unfavorable layers are assessed. The results show that the effect of wind veering on the mean aerodynamic characteristics does not change monotonously with the wind twist angle, and the mean aerodynamic characteristics of models with different heights can be equivalent to wind twist angles at the top of building. When the wind twist angle is smaller than 6.2°, the wind veering effect can be ignored. The objective of this study is to explore the wind loads characteristics of super high-rise buildings with different heights under TWFs, furthermore, to provide useful information for further investigation and future wind-resistant design of skyscrapers.