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機器上下免震構造に関する研究 原子炉建物 -免震構造の上下動連成振動解析-

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

森下 正樹 

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コモンデッキ方式機器上下免震構造の地震応答特性が,これを支持する原子炉建物との動的相互作用の影響を受ける可能性について,解析によって検討した。原子炉建物と免震構造の連成モデル及び非連成モデルによる応答解析を実施し,両者の加速度応答の比較によって影響の程度を検討した。検討の結果をまとめると以下のとおりである。(1)原子炉建物と機器上下免震構造の動的相互作用は顕著ではない。これは,免震振動数と地盤-建屋系の主要振動数が十分離れているためである。(2)非連成モデルによる結果は実用上十分な精度を与え,かつ若干安全側となる。(3)機器上下免震構造が原子炉建物の他の部位での振動挙動に与える影響も無視出来る程度である。

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.

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