Abstract: The seismic responses of soil-pile-isolation pedestal-nuclear island structure and soil-pile-nuclear island structure were studied by large-scale simulated shaking table test. In the test, rubber lead-zinc bearing was used as foundation isolation and placed between pile foundation cap and upper nuclear island structure. The foundation soil was uniform silty clay from an engineering site. The ground motion time history was fitted by RG1.60 response spectrum designed by Nuclear Power Corporation of the United States. The test results show that the isolation bearings can not only change the frequency of the superstructure, reduce the acceleration and the magnitude of the response spectrum, but also dwindle the bending moment of the lower pile, which can reduce the reaction isolation of the superstructure. However, the use of isolation bearings will change the bending moment distribution of pile foundation, thus special seismic design should be made for pile foundation stress and deformation in nuclear power engineering to ensure the seismic stability of the whole soil-pile-superstructure system

Key words: nuclear power, pile foundation, vibration isolation technology, structural dynamic response