Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Evaluation of the Soil-structure Interaction Effect on Seismically Isolated Nuclear Power Plant Structures

지반-구조물 상호작용이 면진 원전구조물의 지진응답에 미치는 영향 평가

  • Lee, Eun-haeng (Department of Civil and Environmental Engineering, Chonnam National University) ;
  • Kim, Jae-min (Department of Marine and Civil Engineering, Chonnam National University) ;
  • Joo, Kwang-ho (Central Research Institute of KHNP) ;
  • Kim, Hyun-uk (Central Research Institute of KHNP)
  • 이은행 (전남대학교 대학원 건설환경공학과) ;
  • 김재민 (전남대학교 해양토목공학과) ;
  • 주광호 (한국수력원자력 중앙연구원) ;
  • 김현욱 (한국수력원자력 중앙연구원)
  • Received : 2016.03.22
  • Accepted : 2016.07.06
  • Published : 2016.11.01
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Abstract

This study intends to evaluate the conservativeness of the fixed-base analysis as compared to the soil-structure interaction (SSI) analysis for the seismically isolated model of a nuclear power plant in Korea. To that goal, the boundary reaction method (BRM), combining frequency-domain and time-domain analyses in a twofold process, is adopted for the SSI analysis considering the nonlinearity of the seismic base isolation. The program KIESSI-3D is used for computing the reaction forces in the frequency domain and the program MIDAS/Civil is applied for the nonlinear time-domain analysis. The BRM numerical model is verified by comparing the results of the frequency-domain analysis and time-domain analysis for the soil-structure system with an equivalent linear base isolation model. Moreover, the displacement response of the base isolation and the horizontal response at the top of the structure obtained by the nonlinear SSI analysis using BRM are compared with those obtained by the fixed-base analysis. The comparison reveals that the fixed-base analysis provides conservative peak deformation for the base isolation but is not particularly conservative in term of the floor response spectrum of the superstructure.

Keywords

References

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