摩擦系応答スペクトルにおける鉛直振動の影響(機械力学,計測,自動制御)

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For the past several years, seismic isolation systems have been focused in the seismic design of industrial facilities. This paper deals with the response reduction effect by friction. Friction is expected to decrease the relative displacement by dissipating the vibration energy. The relative displacement between structure and support becomes larger at long period in the case of linear system. Therefore, the response reduction effect by friction should be utilized positively in the seismic design. However, the response magnification of acceleration is used in the seismic design. The acceleration becomes larger by stick and slip motion. Therefore, the response reduction effect by friction is evaluated. In the past studies, the acceleration of earthquake for horizontal direction was used to obtain the maximum acceleration response. And the response reduction effect was evaluated for horizontal direction. However, the friction force depends on the vertical drag acting on the friction surface. The friction force varies by the vertical acceleration of the earthquake. Therefore, the acceleration response spectrum for seismic design should be proposed considering the vertical acceleration. In this paper, the effect of the vertical acceleration in friction response spectrum is suggested. At first in this study, the characteristics of actual earthquake wave such as maximum acceleration, correlation coefficient and peak frequency is shown. Next, the effect of vertical acceleration of actual earthquake is shown. In the last, the response reduction effect by vertical acceleration of the artificial earthquake wave calculated from the design spectrum is shown.
2010-11-25

摩擦系応答スペクトルにおける鉛直振動の影響(機械力学,計測,自動制御)

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