Numerical simulation of wind veering effects on aeroelastic responses of thousand-meter-scale super high-rise buildings

Abstract

The atmospheric boundary layer (ABL) consists of the atmospheric surface layer (ASL) and the Ekman layer. In the Ekman layer, which typically accounts for the upper 90% of the ABL, the wind veering is generally remarkable along the height. In the wind-resistant design of thousand-meter-scale super high-rise buildings, it is of vital importance to consider the wind veering effects. However, the relevant research on this issue has been rare so far. In this study, based on the authors’ previous study on wind loads acting on thousand-meter-scale super high-rise buildings immersed in the veering wind field, the structural aeroelastic responses of a thousand-meter-scale square-section building model with an aspect ratio of 9:1 under various reduced wind velocities without considering wind veering at 0° wind direction and considering wind veering at 75° wind direction are numerically simulated by utilizing the commercial software ANSYS Workbench 19.1. The wind veering effects on structural aeroelastic responses are comprehensively analyzed. Additionally, the structural dynamic responses with and without considering aeroelasticity are compared. The effects of aerodynamic damping on wind-induced vibration responses are further discussed, and the underlying mechanisms are illustrated in the light of instantaneous flow fields.