Study On Wind Veering Effects On Super-tall Buildings

With the depth study of wind characteristics, understanding of profile on windspeed and direction is more comprehensive and wind direction is found to changewith height. What will be generated on the structural response of impact since windveering? Based on the above background, numerical simulation methods to studythe response of super-tall buildings which were applied rotational wind loads. Mainresearch contents include:Based on classical Ekman (three force model), Geostrophic MomentumApproximation (four force model) and Gradient-wind Momentum Approximation(five force model), established three kinds of wind profiles theoretical model.Measured the wind profile characteristics during Typhoon Nuri and Hagupit werecompared with the theoretical value. Indicated direction veered along the height andveered35°at500m height.Based on ANSYS-CFX platform, LES method was used to complete numericalsimulation on square cross-section high-rise structure. Entrance contains theaverage and pulsating air inlet two cases, eight wind angle of16numericalexamples to study the structure of the surface pressure coefficient distributioncharacteristics, wind coefficient characteristics. Through different direction,different heights, using the combination way to similar research wind loadcharacteristics. Indicated veering direction considered, the wind load on structuresurface is reduced.Based on ANSYS platform, time history analysis method was used to study thesquare super high-rise structure wind-induced responses, including whether toconsider rotating wind, and aerodynamic damping including12numerical examplesto study the structure top displacement and acceleration response. Indicated veeringdirection considered, the overall response of the structure becomes smaller, butthere is a certain increase in crosswind.