摘要

Along-wind aerodynamic damping ratios were identified from wind-induced acceleration responses of 37 aeroelastic models in a simulated turbulence wind environment using the random decrement technique (RDT). Their validity was examined through comparing them with previous research achievements and the results evaluated with quasi-steady theory. Based on them, the characteristics of the along-wind aerodynamic damping of isolated rectangular high-rise buildings were studied. The effects of mass density ratio, generalized stiffness, structural damping ratio, aspect ratio, side ratio and terrain category on the aerodynamic damping ratio of rectangular high-rise buildings were investigated. Results indicated that aerodynamic damping ratio increases monotonically with reduced wind velocity; structural damping ratio, mass density ratio, side ratio, reduced wind velocity and aspect ratio are very important parameters for along-wind aerodynamic damping, while no obvious effect of generalized stiffness and terrain category on aerodynamic damping ratio is observed. According to these results, an empirical aerodynamic damping ratio formula for high-rise buildings was proposed.

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