論文・報告
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大型振動台実験のデータを用い、加振中に損傷を生じたRC造建物の固有振動数の推移について、等価な一自由度系の荷重変形関係とみなされる性能曲線を用いて考察した。時々刻々の固有振動数の推定値は、応答振幅の増大とともに低下し、損傷を生じた場合には応答が収束しても元の値には戻らない傾向を示した。性能曲線の各点と原点とを結ぶ勾配として求めた等価な振動数は、固有振動数と良く対応することが分かった。また、振幅の小さな領域の固有振動数の変化傾向を説明する非線形モデルを提案した。 キーワード: 大型振動台実験、固有振動数、性能曲線 |
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Using data obtained with the large-scale shaking table experiments, changes of the natural frequencies of RC buildings damaged during the shaking test were discussed by denoting the "performance curve" which is a load-deformation relationship for an equivalent one-degree-of-freedom system. When damage occurred during the shaking, the estimated natural frequencies decreased and did not return to its initial value at the end of the tests. The identified natural frequencies were also found to correspond well to the equivalent frequencies obtained as the gradient connecting each point of the performance curve and the origin. In addition, a nonlinear model was proposed to explain the tendency of the natural frequencies to changes at the range of small amplitudes. Key Words: Large-scale shaking table test, Natural frequency, Performance curve |
論文