원형 실린더 구조물의 풍방향 공력감쇠비 산정

Abstract

In the light of its positive damping property, along-wind aerodynamic damping is recognized to have a positive role so as to stabilize the wind induced vibration of tall building structure. The theoretical model developed to predicts aerodynamic damping under the assumption of quasi-steady state demonstrates the occurrence mechanism of aerodynamic damping and describes the influence factors affecting the formation of the damping. In this study, the along-wind aerodynamic damping identified from the measured acceleration responses acquisited through the aeroelastic model test with variant wind speed was compared with the theoretical damping in order to evaluate the reliability of the model. Aerodynamic damping was evaluated based on a virtual dynamic shaker method which is system identification technique developed recently. From the results of this study, it is found that the wind aerodynamic damping has a difference from the theoretical model, which is mainly attributed to the magnitude of the turbulence in different height and mean wind speeds.