産業施設を対象とした免震構造の応答特性に関する研究

Abstract

The nuclear power generation does not produce greenhouse gas. In addition, even an aspect of the generation cost is a superior generation method. However, seismic condition in Japan is severe. Therefore seismic design is important for nuclear power facilities. It is useful to adapt a seismic isolation system into nuclear power facility because the seismic loading can be reduced. Because of improvement of horizontal isolation characteristics and restraint of the cardinal number of laminated rubber bearing, the current laminated rubber bearings are used in the longer period and the high surface pressure. In this case, the stiffness of the laminated rubber bearing in the vertical direction decreases. As the result, the response is increased in natural frequency of the principal components. In this paper, we examined the response acceleration of the principal components in the horizontal/vertical frequency of the laminated rubber bearing. The seismic response analysis with one lumped mass model was carried out. The input seismic waves used Kashiwazaki wave and Onagawa wave. As a result of examination, we confirmed that the response amplification of the principal components of the nuclear power facilities was inhibited by using the laminated rubber bearing with the seismic isolation specification of approximately 20 Hz in the vertical frequency and approximately 2 seconds in the horizontal period.