Dynamic performance evaluation of a 492 m super high-rise building with active tuned mass dampers during four consecutive landfall typhoons within a month. (1st December 2022)

• Record Type: Journal Article
• Authors: Fu, Guoqiang; Quan, Yong; Gu, Ming; Huang, Zifeng; Feng, Chengdong
• Is Part Of: Journal of building engineering. Volume 61(2022)
• Publication Date: 2022-12-01
• Subjects: Field measurement -- Wind effects -- Super high-rise building -- Landfall typhoons -- Dynamic performance -- Active tuned mass damper; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.105259
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: Field measurement is the most reliable and intuitive method to assess the wind effects of super high-rise buildings. However, due to the different inherent characteristics of each typhoon, the observations may be different or even contradictory. Therefore, there is a need to conduct further analysis on the wind effects during typhoons to reveal more general results. In this study, wind-induced acceleration responses collected by the structural health monitoring system installed atop the Shanghai World Financial Center (SWFC) during the landfall of four consecutive typhoons (Ampil, Jongdari, Yagi and Rumbia) within a month are systematically investigated. The first five-order modal directions are determined based on the spectral method. The envelope random decrement technique is adopted to identify the natural frequencies and damping ratios, and the amplitude dependencies and time-varying characteristics of the structural dynamic properties are also analyzed. Furthermore, the control performance of active tuned mass damper (ATMD) system during typhoons is discussed. Finally, the serviceability of the skyscraper during typhoons is assessed, and the global damage evaluation is performed. The results show that the natural frequencies decrease with increasing amplitude and present V-shaped variation trends with time. The damping ratios almost increase with increasing amplitudes but do not show any noticeable variation trend with time. The time-varying environmental conditions may have considerable effects on the modal parameters, and those effects may be superimposed in a short time. The ATMD system can effectively mitigate wind-induced vibrations. The occupant comfort is satisfactory, and no evident structural damage is detected during typhoons. Highlights: Field monitoring of a 492 m super high-rise building during the landfall of four consecutive typhoons within a month. Amplitude dependencies and time-varying characteristics of the structural dynamic properties were systematically investigated. Control performance of the ATMD system and serviceability of the skyscraper during the four landfall typhoons were evaluated. Global damage evaluation of the skyscraper was performed to assess the wind effects of the four landfall typhoons. It is the first found that the time-varying effects of the environmental conditions on the dynamic properties may not dissipate completely but are superimposed in a short time.