Dynamic Behavior of Supertall Building with Active Control System during Super Typhoon Mangkhut

This paper presents observations of structural dynamic characteristics and wind-induced responses of a 600-m-high skyscraper installed with an active tuned mass damper (ATMD) system during super typhoon Mangkhut. The structural dynamic characteristics (i.e., natural frequency, damping ratio, and mode shape) of the skyscraper are estimated along the structural modal directions based on the measurements during the typhoon, which are in good agreement with those determined by the finite element method and forced vibration test. The wind-induced responses and damping ratios of the skyscraper with and without the operation of the ATMD system are investigated, and the results show that the ATMD system can suppress the structural responses by mitigating the vibrations of the fundamental sway modes. Global damage evaluation indicates that there is no evident structural damage occurred on the skyscraper during the violent typhoon event. This paper aims to further the understanding of wind effects on supertall buildings under extreme wind conditions and provide useful information for the wind-resistant design and development of vibration control techniques for future skyscrapers. (C) 2020 American Society of Civil Engineers.