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Wind and Structures Volume 23, Number 3, September 2016 , pages 231-251 DOI: https://doi.org/10.12989/was.2016.23.3.231 |
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Wind tunnel tests of 3D wind loads on tall buildings based on torsional motion-induced vibrations |
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Lianghao Zou, Guoji Xu, C.S. Cai and Shuguo Liang
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| Abstract | ||
| This paper presents the experimental results of the wind tunnel tests for three symmetric, rectangular, tall building models on a typical open terrain considering the torsional motion-induced vibrations. The time histories of the wind pressure on these models under different reduced wind speeds and torsional amplitudes are obtained through the multiple point synchronous scanning pressure technique. Thereafter, the characteristics of both the Root Mean Square (RMS) coefficients and the spectra of the base shear/torque in the along-wind, across-wind, and torsional directions, respectively, are discussed. The results show that the RMS coefficients of the base shear/torque vary in the three directions with both the reduced wind speeds and the torsional vibration amplitudes. The variation of the RMS coefficients in the along-wind direction results mainly from the change of the aerodynamic forces, but sometimes from aeroelastic effects induced by torsional vibration. However, the variations of the RMS coefficients in the across-wind and torsional directions are caused by more equal weights of both the aerodynamic forces and the aeroelastic effects. As such, for the typical tall buildings, the modification of the aerodynamic forces in the along-wind, across-wind, and torsional directions, respectively, and the aeroelastic effects in the across-wind and torsional directions should be considered. It is identified that the torsional vibration amplitudes and the reduced wind speeds are two significant parameters for the aerodynamic forces on the structures in the three directions. | ||
| Key Words | ||
| tall buildings; wind tunnel test; torsional motion-induced vibration; wind loads; aeroelastic effects | ||
| Address | ||
| Lianghao Zou: School of civil engineering, Wuhan University, 299 bayi Road, Wuhan, 430072 China; Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge,Louisiana 70803 USA Guoji Xu, C.S. Cai: Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge,Louisiana 70803 USA Shuguo Liang: School of civil engineering, Wuhan University, 299 bayi Road, Wuhan, 430072 China | ||