Wind and Structures

Techno-Press (테크노프레스)
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Application of probabilistic method to determination of aerodynamic force coefficients on tall buildings

  • Yong Chul Kim (Department of Engineering, Tokyo Polytechnic University) ;
  • Shuyang Cao (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University)
  • Received : 2022.12.16
  • Accepted : 2023.04.07
  • Published : 2023.04.25
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Abstract

Aerodynamic force coefficients are generally prescribed by an ensemble average of ten and/or twenty 10-minute samples. However, this makes it difficult to identify the exact probability distribution and exceedance probability of the prescribed values. In this study, 12,600 10-minute samples on three tall buildings were measured, and the probability distributions were first identified and the aerodynamic force coefficients corresponding to the specific non-exceedance probabilities (cumulative probabilities) of wind load were then evaluated. It was found that the probability distributions of the mean and fluctuating aerodynamic force coefficients followed a normal distribution. The ratios of aerodynamic force coefficients corresponding to the specific non-exceedance probabilities (Cf,Non) to the ensemble average of 12,600 samples (Cf,Ens), which was defined as an adjusting factor (Cf,Non/Cf,Ens), were less than 2%. The effect of coefficient of variation of wind speed on the adjusting factor is larger than that of the annual non-exceedance probability of wind load. The non-exceedance probabilities of the aerodynamic force coefficient is between PC,nonex = 50% and 60% regardless of force components and aspect ratios. The adjusting factors from the Gumbel distribution were larger than those from the normal distribution.

Keywords

Acknowledgement

This research was supported by the State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University (Project No. SLDRCE21-05). The authors gratefully acknowledge this support.

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