Various vibration attenuation methods such as a base isolation and a vibration control are suggested as seismic safety technique for large scale architectural and civil structure, and these methods have been practical used now. In recent years, these vibration reduction technologies begin to be applied to a small-scale structure. Application of seismic safety technology for a small-scale structure, however, is still remained a lot of developmental element yet. The enormous damage of overturning has been occurred in recent huge earthquakes including Great East Japan Earthquake. Therefore, the countermeasure technique should be an urgent task for huge earthquakes which are expected the occurrence in near future. In this study, a vibration attenuation system for lightweight structure with simple mechanism, good performance and low construction cost. This paper describes the fundamental design index of the overturning prevention mechanism for vending machine with a friction sliding from preliminary seismic response analysis, and new type simple mechanism using rotational support satisfied the specifications is examined from experimental and analytical verification.
This paper describes the results of the response analysis and the experimental tests on the newly developed earthquake isolation system based on the theory of friction pendulum. In Japan, many types of earthquake isolation device or system have been developed and utilized to protect computers, precision equipments and important works of art from the severe seismic attacks. Although the performance of isolation of the each every one of the systems is sufficient, cost of the system is considered generally higher than the user expected and the system requires enough surrounding space to obtain adequate isolation performance. When applying the isolation device to the objects such as display cabinets in museum, computer server racks, bookshelves in library and vending machines which are generally placed adjacent to the wall, it is desirable to set them as closer to the behind wall as possible without decreasing their performance of isolation very much. The friction pendulum type isolation device with poly-curvature has been developed to satisfy these requirements, and the response analysis and the shake table tests have been carried out to investigate the performance of the system.
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