Design and Analysis of Isolation Effectiveness for Three-dimensional Base-seismic Isolation of Nuclear Island Building
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In order to investigate the application of 3D base-seismic isolation system in nuclear power plants(NPPs), comprehensive analysis of constitution and design theory for 3-dimensional combined isolationbearing (3D-CIB) was presented and derived. Four different vertical stiffness of 3D-CIB was designed toisolate the nuclear island (NI) building. This paper aimed at investigating the isolation effectiveness of3D-CIB through modal analysis and dynamic time-history analysis. Numerical results in terms of dynamicresponse of 3D-CIB, relative displacement response, acceleration and floor response spectra (FRS)of the superstructure were compared to validate the reliability of 3D-CIB in mitigating seismic response. The results showed that 3D-CIB can significantly attenuate the horizontal acceleration response, and afair amount of the vertical acceleration response reduction of the upper structure was still observed. 3DCIBplays a significant role in reducing the horizontal and vertical FRS, the vertical FRS basically do notvary with the floor height. The smaller the vertical stiffness of 3D-CIB is, the better the vertical isolationeffectiveness is, whereas, it will increase the displacement and the rocking effect of superstructure. Although the advantage of 3D-CIB is that the vertical stiffness can be flexibly adjusted, it should bedesigned by properly accounting for the balance between the isolation effectiveness and displacementcontrol including rocking effect. The results of this study can provide the technical basis and guidance forthe application of 3D-CIB to engineering structure.
Abstract
In order to investigate the application of 3D base-seismic isolation system in nuclear power plants(NPPs), comprehensive analysis of constitution and design theory for 3-dimensional combined isolationbearing (3D-CIB) was presented and derived. Four different vertical stiffness of 3D-CIB was designed toisolate the nuclear island (NI) building. This paper aimed at investigating the isolation effectiveness of3D-CIB through modal analysis and dynamic time-history analysis. Numerical results in terms of dynamicresponse of 3D-CIB, relative displacement response, acceleration and floor response spectra (FRS)of the superstructure were compared to validate the reliability of 3D-CIB in mitigating seismic response. The results showed that 3D-CIB can significantly attenuate the horizontal acceleration response, and afair amount of the vertical acceleration response reduction of the upper structure was still observed. 3DCIBplays a significant role in reducing the horizontal and vertical FRS, the vertical FRS basically do notvary with the floor height. The smaller the vertical stiffness of 3D-CIB is, the better the vertical isolationeffectiveness is, whereas, it will increase the displacement and the rocking effect of superstructure. Although the advantage of 3D-CIB is that the vertical stiffness can be flexibly adjusted, it should bedesigned by properly accounting for the balance between the isolation effectiveness and displacementcontrol including rocking effect. The results of this study can provide the technical basis and guidance forthe application of 3D-CIB to engineering structure.
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