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http://dx.doi.org/10.5000/EESK.2020.24.2.087

Analysis of Seismic Response due to the Dynamic Coupling Between a Primary Structure and Secondary System  

Jung, Kwangsub (Research Reactor System Design Division, Korea Atomic Energy Research Institute)
Kwag, Shinyoung (Department of Civil & Environmental Engineering, Hanbat National University)
Choi, In-Kil (Mechanical and Structural Safety Research Division, Korea Atomic Energy Research Institute)
Eem, Seunghyun (Major in Plant System Engineering, School of Convergence & Fusion System Engineering, Kyungpook National University)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.24, no.2, 2020 , pp. 87-93 More about this Journal
Abstract
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.
Keywords
Dynamic coupling criteria; Seismic analysis; Primary structure and secondary system; Effects of interaction; Mass and frequency ratio;
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