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Smart Structures and Systems
  Volume 25, Number 1, January 2020 , pages 81-96
DOI: https://doi.org/10.12989/sss.2020.25.1.081
 


Wind-induced responses and dynamic characteristics of a super-tall building under a typhoon event
X.G. Hua, K. Xu, Y.W. Wang, Q. Wen and Z.Q. Chen

 
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.
 
Key Words
    field measurements; wind characteristics; crosswind responses; modal identification; Canton Tower
 
Address
(1) X.G. Hua, K. Xu, Z.Q. Chen:
Key Laboratory forWind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, 410082 Changsha, Hunan, China;
(2) Y.W. Wang:
Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China;
(3) Q. Wen:
Hunan Provincial Key Laboratory of Structural Engineering forWind Resistant and Vibration Control, Hunan University of Science and Technology, 411201, Xiangtan, China.
 

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