Abstract
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 from the viewpoint of energy. The ratio between elastic energy and input energy is utilized. In this paper, "Response Reduction Map" based on energy for long period friction system is suggested. This map shows the range that energy response ratio is less than the ratio of the linear system. The response reduction map without complex non-linear time history calculation can easily obtain the proper parameters, such as natural period or friction force. At first in this study, the response reduction map by actual earthquake wave is shown. Next, the response reduction map by the artificial earthquake wave calculated from the design spectrum is shown.
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