Evaluation of Vortex-induced Vibration of a Tower-supported Steel Stack under Strong Winds Based on Full-scale Measurement

The wind-induced vibration behavior of a tower-supported steel stack is not yet clarified due to a lack of data from full-scale observations. Therefore, we performed a wind response measurement of a tower-supported steel stack in a long term, and studied the effects of strong winds on the stack using the data including large vortex-induced vibrations. In particular, the growth pattern of vortex-induced vibration varies widely in a block of 10-minute duration, which is the standard averaging time of a mean wind speed used in Japan. In this paper, we discuss the structural properties of the tower-supported steel stack, such as aerodynamic and structural damping, as well as the influences of the averaging time of wind speed on the evaluation of its vortex-induced vibration growth. Additionally, we focus on the negative aerodynamic damping force acting on the stack