Development of seismic isolation system in vertical direction; Coupled response analysis of reactor building and common deck isolation system

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Study was made on the effect of dynamic interaction between reactor building and common deck isolation structure. Dynamic response analyses were made with a coupled and a decoupled model of the reactor building and the isolation structure. The effect of the dynamic interaction was evaluated by comparing these analysis results. The results of the study can be summarized as below; (1)Dynamic coupling effect between reactor building and the common deck isolation structure is not significant. This can be attributed to the fact that the isolation frequency is sufficiently lower than the fundamental frequency of the soil-structure system. (2)The decoupled analysis model was found to give response results with practically sufficient accuracy and slight conservatism. (3)The effect of the response of common deck isolation structure on the response of the reactor building is also negligible.