Smart Structures and Systems

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Wind-induced responses and dynamic characteristics of a super-tall building under a typhoon event

  • Hua, X.G. (Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University) ;
  • Xu, K. (Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University) ;
  • Wang, Y.W. (Department of Civil and Structural Engineering, Hong Kong Polytechnic University) ;
  • Wen, Q. (Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control, Hunan University of Science and Technology) ;
  • Chen, Z.Q. (Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University)
  • Received : 2018.12.01
  • Accepted : 2019.10.13
  • Published : 2020.01.25
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Abstract

Wind measurements were made on the Canton Tower at a height of 461 m above ground during the Typhoon Vincente, the wind-induced accelerations and displacements of the tower were recorded as well. Comparisons of measured wind parameters at upper level of atmospheric boundary layer with those adopted in wind tunnel testing were presented. The measured turbulence intensity can be smaller than the design value, indicating that the wind tunnel testing may underestimate the crosswind structural responses for certain lock-in velocity range of vortex shedding. Analyses of peak factors and power spectral density for acceleration response shows that the crosswind responses are a combination of gust-induced buffeting and vortex-induced vibrations in the certain range of wind directions. The identified modal frequencies and mode shapes from acceleration data are found to be in good agreement with existing experimental results and the prediction from the finite element model. The damping ratios increase with amplitude of vibration or equivalently wind velocity which may be attributed to aerodynamic damping. In addition, the natural frequencies determined from the measured displacement are very close to those determined from the acceleration data for the first two modes. Finally, the relation between displacement responses and wind speed/direction was investigated.

Keywords

Acknowledgement

Supported by : National Science Foundation of China

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