[논문]지반-구조물 상호작용이 면진 원전구조물의 지진응답에 미치는 영향 평가

이은행; 김재민; 주광호; 김현욱

doi:10.5000/eesk.2016.20.6.379

지반-구조물 상호작용이 면진 원전구조물의 지진응답에 미치는 영향 평가
Evaluation of the Soil-structure Interaction Effect on Seismically Isolated Nuclear Power Plant Structures 원문보기

한국지진공학회논문집 = Journal of the Earthquake Engineering Society of Korea, v.20 no.6, 2016년, pp.379 - 389

이은행 (전남대학교 대학원 건설환경공학과) , 김재민 (전남대학교 해양토목공학과) , 주광호 (한국수력원자력 중앙연구원) , 김현욱 (한국수력원자력 중앙연구원)

Abstract ▼ AI-Helper

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.

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가설 설정

Besides, for the soil profiles SC1 and SC2, it appears in Fig. 13(a) and 13(b) that the fixed-base response is very close to the SSI response at the natural frequency of the base isolation whereas the spectral acceleration response exhibits clear difference at the natural frequency of the superstructure and at frequency range higher than 2 Hz and that this difference accentuates with larger intensity of the seismic input. On the whole, it can be observed that the fixed-base response is smaller than the SSI response.

제안 방법

In a will to evaluate the conservativeness of the fixed-base analysis as compared to the soil-structure interaction (SSI) analysis for a base-isolated model, this study conducted nonlinear SSI analysis using BRM (Boundary Reaction Method) and fixed-base analysis on a seismically isolated model of a nuclear power plant. The reliability of BRM was secured through the verification of the numerical model with an equivalent linear base isolation model.
In this study, calibration of the boundary reactions was conducted for the equivalent linear problem prior to the time-domain nonlinear analysis by BRM (Fig. 11). The scale factor for the boundary reactions was determined with reference to the response spectrum of the superstructure obtained by the frequency-domain SSI analysis at the frequency of the base isolation (0.
In substructure (II) of BRM, need is for a program enabling to deal with the interface by means of a type of energy-absorbing boundary condition that is the PML element or damper-spring element within the analysis domain for the efficient treatment of the radial damping occurring in the SSI[27]. In this study, the boundary is modeled using damper-spring elements. The coefficients for the spring element and the viscous damper element at the boundary proposed by Deek and Randolph [36], Kellezi[37], and Liu[38] are adopted.
1) In view of the nonlinear displacement of the base isolation, the response provided by the fixed-base condition appeared to be larger and the difference tended to accentuate with higher intensity of the input ground motion. It can thus be stated that the analysis results for the seismically isolated structure assuming fixed base lead to conservative computation of the design displacement of the base isolation in the seismically isolated nuclear facilities.
Nonlinear SSI analysis using BRM and nonlinear time history analysis assuming a fixed-base without consideration of the soil profile were carried out for the seismically isolated structure. The BRM analysis model for the nonlinear SSI analysis is identical to the linear analysis model except for the nonlinear elements of the base isolation.

이론/모형

In a will to evaluate the conservativeness of the fixed-base analysis as compared to the soil-structure interaction (SSI) analysis for a base-isolated model, this study conducted nonlinear SSI analysis using BRM (Boundary Reaction Method) and fixed-base analysis on a seismically isolated model of a nuclear power plant. The reliability of BRM was secured through the verification of the numerical model with an equivalent linear base isolation model. Nonlinear SSI analysis was performed considering 3 types of soil profile and 5 different intensities of the seismic load.

성능/효과

1) In view of the nonlinear displacement of the base isolation, the response provided by the fixed-base condition appeared to be larger and the difference tended to accentuate with higher intensity of the input ground motion. It can thus be stated that the analysis results for the seismically isolated structure assuming fixed base lead to conservative computation of the design displacement of the base isolation in the seismically isolated nuclear facilities.
2) With regard to the floor response spectrum of the superstructure, both fixed-base condition and SSI condition were seen to provide similar results in case of hard soil and small input motion but the difference in the response increased with higher intensity of the input ground motion and softer soil. Moreover, the floor response spectrum under fixed-base condition was smaller than that under SSI condition.

후속연구

This study intends to evaluate the conservativeness of the fixed-base analysis as compared to the SSI analysis for the seismically isolated model of a nuclear power plant. For this purpose, the nonlinear seismic response of a seismically isolated NPP under fixed-base condition is compared to the one considering the SSI effect.

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