Seismic responses due to the dynamic coupling between a primary structure and secondary system connected to a structure are analyzed in this study. The seismic responses are compared based on dynamic coupling criteria and according to the error level in the natural frequency, with the recent criteria being reliant on the error level in the spectral displacement response. The acceleration responses and relative displacement responses of a primary structure and a secondary system for a coupled model and two different decoupled models of two degrees-of-freedom system are calculated by means of the time integration method. Errors in seismic responses of the uncoupled models are reduced with the recent criteria. As the natural frequency of the secondary system increases, error in the natural frequency decreases, but seismic responses of uncoupled models can be underestimated compared to that of coupled model. Results in this paper can help determine dynamic coupling and predict uncoupled models’ response conservatism.

A B S T R A C T
1. 서 론
2. 본 론
    2.1 연계 및 비연계 모델
    2.2 동적 연계기준 비교
    2.3 연계 및 비연계 모델의 지진응답 해석
3. 결 론
REFERENCES

• 정광섭(한국원자력연구원 연구로공학부) | Jung Kwangsub (Research Reactor System Design Division, Korea Atomic Energy Research Institute)
• 곽신영(한밭대학교 건설환경공학과) | Kwag Shinyoung (Department of Civil & Environmental Engineering, Hanbat National University)
• 최인길(한국원자력연구원 기계‧구조안전연구부) | Choi In-Kil (Mechanical and Structural Safety Research Division, Korea Atomic Energy Research Institute)
• 임승현(경북대학교 융복합시스템공 학부 플랜트시스템전공) | Eem Seunghyun (Major in Plant System Engineering, School of Convergence & Fusion System Engineering, Kyungpook National University) Corresponding author