Structural Engineering and Mechanics

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Dynamic characteristics monitoring of a 421-m-tall skyscraper during Typhoon Muifa using smartphone

  • Kang Zhou (College of Civil Engineering, Hefei University of Technology) ;
  • Sha Bao (Shanghai Branch, China Construction Eighth Engineering Division Co., Ltd.) ;
  • Lun-Hai Zhi (College of Civil Engineering, Hefei University of Technology) ;
  • Feng Hu (College of Civil Engineering, Hefei University of Technology) ;
  • Kang Xu (School of Civil Engineering, Central South University) ;
  • Zhen-Ru Shu (School of Civil Engineering, Central South University)
  • Received : 2023.03.13
  • Accepted : 2023.07.27
  • Published : 2023.09.10
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Abstract

Recently, the use of smartphones for structural health monitoring in civil engineering has drawn increasing attention due to their rapid development and popularization. In this study, the structural responses and dynamic characteristics of a 421-m-tall skyscraper during the landfall of Typhoon Muifa are monitored using an iPhone 13. The measured building acceleration responses are first corrected by the resampling technique since the sampling rate of smartphone-based measurement is unstable. Then, based on the corrected building acceleration, the wind-induced responses (i.e., along-wind and across-wind responses) are investigated and the serviceability performance of the skyscraper is assessed. Next, the amplitude-dependency and time-varying structural dynamic characteristics of the monitored supertall building during Typhoon Muifa are investigated by employing the random decrement technique and Bayesian spectral density approach. Moreover, the estimated results during Muifa are further compared with those of previous studies on the monitored building to discuss its long-term time-varying structural dynamic characteristics. The paper aims to demonstrate the applicability and effectiveness of smartphones for structural health monitoring of high-rise buildings.

Keywords

Acknowledgement

The work described in this paper was fully supported by grants from the National Natural Science Foundation of China (52208475, 51978230, and 52278495), and a grant from the Natural Science Foundation of Anhui Province (2108085J29).

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