Effects of the Turbulence Integral Scale on the Non-Gaussian Properties and Extreme Wind Loads of Surface Pressure on a CAARC Model
Publication: Journal of Structural Engineering
Volume 148, Issue 11
Abstract
To study the effects of the turbulence integral scale on the non-Gaussian properties and extreme wind loads of surface pressure, the surface pressures for two Commonwealth Advisory Aeronautical Research Council (CAARC) scaled models were measured in three turbulent flow fields with different turbulence integral scales. The results show that the surface pressure distribution on the windward surface is fundamentally Gaussian, while the surface pressures on the side and leeward surfaces are markedly non-Gaussian. The deviation from normality strongly depends on the ratio of the turbulence integral scale to the windward width (). With changing , the fluctuating pressure, skewness, kurtosis, probability density distribution, non-Gaussian peak factors, and extreme wind loads vary significantly. In addition, the surface pressure nonnormality becomes more evident for lower wind fields, increasing , , and the fluctuating pressure’s peak factor. In contrast, the fluctuating pressure decreases with decreasing wind-field , resulting in the underestimation of extreme wind loads. Further, the extreme wind load maximal error margin reaches 30.7% when the simulated turbulence integral scale error margin is 70%, even for nonnormal surface pressures. Hence, nonnormality of the surface pressure and the effects of the turbulence integral scale should be carefully considered when estimating extreme wind loads for CAARC standard tall buildings using wind-tunnel tests.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work was supported by the National Natural Science Foundation of China (Grant Nos. 51878580 and 52108477).
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Published In
Journal of Structural Engineering
Volume 148 • Issue 11 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Sep 16, 2021
Accepted: Jun 17, 2022
Published online: Aug 29, 2022
Published in print: Nov 1, 2022
Discussion open until: Jan 29, 2023
ASCE Technical Topics:
- Continuum mechanics
- Design (by type)
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Fluid mechanics
- Gaussian process
- Hydraulic engineering
- Hydraulic properties
- Hydrologic engineering
- Infrastructure
- Integrals
- Load factors
- Mathematics
- Pipeline systems
- Pipes
- Pressure distribution
- Pressure pipes
- Probability
- Solid mechanics
- Stochastic processes
- Structural design
- Structural dynamics
- Structural engineering
- Surface properties
- Turbulence
- Water and water resources
- Wind engineering
- Wind loads
- Wind pressure
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