Seismic Isolation Devices

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Seismic Isolation Devices

Seismic Isolation Devices

Abstract

In a base-Seismic Isolation Devices building, the rubber bearings, being as protectors of the superstructure, sometimes should also be protected from failure because the failure of rubber bearings may result in serious damage to superstructure. In this paper, three failure-prevention approaches of rubber bearings are proposed. The simplest way is to limit maximum stroke of rubber bearings with stoppers and buffers. This is called soft pounding protection. Another way is to arrange additional stiffness components at abutments in certain distance from the protected rubber bearings, which is called stiffness variable protection. The third way is to install backup supporters with friction sliding plate on their top beside rubber bearings. This is called soft landing protection. The principle, working mechanism and analytical models for these safeguard devices are studied. The effectiveness of these approaches for protecting rubber bearings is discussed by examples.

Seismic Isolation Devices

Conclusion

When we use seismic isolator in the structure the structure  behaves like earthquake resistant structure. A seismic isolator device absorbs the shock and reduces the stiffness as well as damping in the structure. It is most effective for low to medium rise structure which is constructed on hard soil. Seismic isolation serves further step onward for improved seismic safety. The construction cost mainly depends on the design force level of conventional building and the location of the plane of isolation. The construction cost increases in very lesser amount to achieving a structure which will have a considerably better seismic performance during major earthquakes. The dominant problem in comparing the costs and benefits of a conventional and an isolated structure is the significant difference in their performance characteristics.