Forced vibration tests on the reactor building of a nuclear power station, 2

Simulation analyses of forced vibration tests on the reactor building of Tsuruga Unit No.2 Nuclear Power Station were performed in order to explain the features appearing in the test results in more detail. The analysis models were characterized by the technique to evaluate the stiffness of the Inner Concrete Structure and a three-dimensional model of the Reactor External Building. Factor analyses on the vibration characteristics of the structure were also performed using these models and a number of important properties were revealed. The effects of flexibility of the base mat on vibration characteristics of the structure were also investigated. More reasonable design models were proposed reflecting the results of the investigations, and earthquake response analyses were performed using these new design models, which gave much better results. (author)