Abstract:Along-wind aerodynamic damping ratio is identified from wind-induced response of 37 aeroelastic models in a simulated turbulence wind environment using the random decrement technique (RDT). Their validity is examined through comparison with previous research achievements and the results evaluated by quasi-steady theory. Based on it, the characteristics of along-wind aerodynamic damping of isolated square high-rise buildings are studied. The effects of density ratio, generalized stiffness, structural damping ratio, aspect ratio, side ratio and terrain category on aerodynamic damping ratio of square high-rise buildings are investigated. Results indicate that: aerodynamic damping ratio increases monotonically with reduced wind velocity; structural damping ratio, density ratio, side ratio, reduced wind velocity and aspect ratio are very important parameters for along-wind aerodynamic damping, while no clear effect of generalized stiffness and terrain category on aerodynamic damping ratio is observed. According to the database, an empirical aerodynamic damping function for high-rise buildings is proposed.