The Eradi Quake System (EQS) is a seismic isolation bearing system designed to minimize forces and displacements experienced by structures subjected to ground motion. The EQS dissipates seismic energy through friction of Poly Tetra Fluoro Ethylene (PTFE) disk pad. In general, a force-displacement relationship of EQS has post yield stiffness hardening during large inelastic displacement. In this study, seismic responses of seismically isolated nuclear power plant (NPP) subjected to design basis earthquake (DBE) and beyond design basis earthquakes (150% DBE and 167% DBE) are compared considering the post yield stiffness hardening effect of EQS. From the results, it can be observed that if the post-yield stiffness hardening effect of EQS is increased, the displacement response of EQS is reduced, and the acceleration and shear responses of containment structures of NPP is increased.

1. 서 론
 2. EQS 면진장치의 면진거동의 특성
 3. EQS가 적용된 면진 원전구조물의 지진응답 분석
  3.1 예제 원전구조물
  3.2 원전구조물에 대한 입력지진
 4. EQS의 항복 후 강성의 비선형 경화특성을 고려한면진된 원전구조물의 지진응답 분석
  4.1 EQS의 비선형모델을 위한 주요해석인자 평가
  4.2 EQS의 비선형 경화 특성의 변화에 따른 구조물의 응답 비교
  4.3 EQS의 비선형 경화 특성의 변화에 따른 설계초과지진에서의구조물의 응답비교
  4.4 EQS의 항복 후 강성에 대한 비선형 경화성분의 지수()에 따른 응답 비교
 5. 결 론
 / REFERENCES /

• 김병수(강원대학교 토목공학과) | Kim Byeong-Su
• 송종걸(강원대학교 토목공학과) | Song Jong-Keol Corresponding author