Shaking Table Test of Simple and Affordable Seismic Isolation

Abstract eng:
Seismic isolation is one of very effective ways to mitigate damages to building/houses caused by earthquakes. However, the application is still limited to specific buildings and houses. The research and development project for disaster mitigation of developing countries started from 2006 by Building Research Institute Japan (BRI) in cooperation with the network of research institutes in earthquake prone area. The development of simple and affordable seismic isolation was selected as one of the study components in this project. For the purpose to evaluate possibility of simple and affordable isolation for developing countries, shaking table tests of two isolation systems were conducted in Building Research Institute. The Isolator systems were selected from viewpoint of feasibility for developing counties such as cost and simplicity, etc. One is sliding type base isolator made of stones. Several combinations of different stone types and surface finishing for upper and lower plates were tested. Another is laminated rubber bearing type device that was formed using layer of scrap tire pads (STP). Load-deformation curves of stone isolators and STP devices were obtained by the shaking table and cyclic loading tests. The performances of stone and STP devices were reasonable. Applicability of these devices on the seismic isolation system considering cost benefit was clarified.

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