Study on seismic base isolation of LWR plants

In the tests of isolator elements and base isolation systems, the hysteresis characteristics and the energy adsorption capability of isolator elements, and the response characteristics of base isolation systems subjected to horizontal two directional input excitation were obtained. As for the seismic response characteristics of a horizontally base isolated building, it was found that, in some cases, the maximum relative displacement was slightly increased due to the effect of orthogonal directional input excitations. In the tri-axial shaking table test results, the effects of orthogonal horizontal input excitation and vertical input excitation on the acceleration response were not clearly shown in the test results. (author)