EFFECTS OF NATURAL FREQUENCY RATIO OF ACROSS-WIND TO TORSION ON WIND-INDUCED RESPONSES OF A HIGH-RISE BUILDING

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  • 高層建築物の風応答における風直角方向と捩れの固有振動数比の影響に関する研究
  • コウソウ ケンチクブツ ノ カゼオウトウ ニ オケル カゼ チョッカク ホウコ

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Abstract

The effects of the natural frequency ratio n_θ/n_x of the across-wind to the torsional vibration on wind-induced responses of a high-rise building has been investigated in wind tunnel tests using a multi-degree-of-freedom aeroelastic model with a side-span ratio of 2 and an aspect ratio of 5. The across-wind response displacement increases steeply as the natural frequency of across-wind vibration close to that of torsional vibration. This phenomenon is caused by the increasing natural frequency component of torsional vibration in the across-wind direction. It is also inherent in motion-induced wind forces in the across-wind direction accompanied by the torsional vibration. However, n_θ/n_x has small effects on the aerodynamic damping ratios and the motion-induced wind forces in the across-wind direction. The difference in the wind response in the across-wind direction due to changing n_θ/n_x is generated by the difference in the magnification factor in the across-wind direction.

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