Dynamics & Design Conference
Online ISSN : 2424-2993
2017
セッションID: 238
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3 次元免震を適用した重要産業施設のロッキング振動に関する研究
*富田 紀昭藤田 聡
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会議録・要旨集 フリー

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Many earthquakes have occurred in Japan and Japanese design seismic wave for several plants have become more severe after strong earthquakes. Especially, since vertical seismic conditions have became more severe, it is difficult to ensure the safety margin of the seismic evaluations in industrial facilities. As a way to ensure the margin of seismic evaluations, it is effective to adopt the vertical seismic isolation system. When the vertical frequency with the vertical isolation system becomes low frequency range, the rocking vibration will occur. By using the seismic isolation system of approximately 3 Hz in vertical frequency, the response in vertical direction is reduced without large rocking vibration. However, variations of a specification in seismic isolation system may occur in actual isolation device. Therefore, in this paper, the vibration characteristic including the rocking vibration is discussed, and also an analysis method is evaluated in consideration of the variation of vertical stiffness. Then, using the proposed analytical method, the tendencies of the vertical frequency variation and the rocking vibration response are confirmed. The rocking vibration occurs because of the deviation between the center of gravity and center of stiffness. Therefore, it is necessary to control the decentering between the center of gravity and rigidity.
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© 2017 一般社団法人 日本機械学会
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