SLOSHING IN A CYLINDRICAL LIQUlD STORAGE TANK WITH A SINGLE-DECK TYPE FLOATING ROOF WITH CENTER PONTOON SUBJECTED TO SEISMIC EXCITATION

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  • MATSUI Tetsuya
    Dept. of Architecture, Faculty of Science and Technology, Meijo Univ.

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Other Title
  • センターポンツーン付シングルデッキ型浮屋根を有する円筒液体貯槽の地震時スロッシング応答
  • センター ポンツーン ツキ シングル デッキガタ ウキヤネ オ ユウスル エントウ エキタイ チョソウ ノ ジシンジ スロッシング オウトウ

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Abstract

An analytical solution is presented to predict the sloshing response of a cylindrical liquid storage tank with a single-deck type floating roof under seismic excitation. The floating roof is considered to be composed of an inner deck stiffened with outer and center pontoons. The deck is idealized as an isotropic elastic plate with uniform stiffness and mass, while the outer and center pontoons are modeled as an elastic curved beam and a rigid circular plate, respectively. The contained liquid is assumed to be inviscid, incompressible and irrotational. The dynamic interaction between the floating roof and the liquid is taken into account exactly within the framework of linear potential theory. By expanding the response of the coupled deck-pontoon system into free vibration modes in air and employing the Fourier-Bessel expansion technique in cylindrical coordinates, the solution is obtained in an explicit form which will be useful for parametric understanding of the sloshing behavior and preliminary study in the early design stage. Numerical results are provided to investigate the effect of the presence of the center pontoon on the sloshing response of the floating roof.

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