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池末 俊一*; 岩崎 晃久*; 佐郷 ひろみ*; 横井 忍*; 山本 智彦
Proceedings of the ASME 2024 Pressure Vessels & Piping Conference (PVP 2024) (Internet), 9 Pages, 2024/07
During an earthquake, sloshing occurs in a cylindrical tank when a frequency component close to the natural frequency of sloshing is included in the seismic wave. When high amplitude sloshing occurs, the free liquid surface level fluctuates greatly in the tank, and the liquid surface collides with the roof of the tank. In tank design, it is important to evaluate the sloshing load acting on the roof. In this study, we extended this method to deal with seismic wave excitation. In seismic wave excitation, the tank is excited by irregular wave, and the phenomenon of sloshing becomes more complicated than sinusoidal excitation. To simplify this complicated phenomenon, we proposed a concept of equivalent growth wave number. This number represents the magnitude of the increase in the peak of liquid surface level, during seismic wave excitation. We proposed a method to quantitatively evaluate this number from seismic response analysis. In addition, we proposed a method to evaluate the vertical load on the roof during seismic wave excitation, by introducing this number into the predictive evaluation method.
池末 俊一*; 森田 英之*; 佐郷 ひろみ*; 横井 忍*; 山本 智彦
Proceedings of the ASME 2023 Pressure Vessels and Piping Conference (PVP 2023) (Internet), 10 Pages, 2023/07
When a cylindrical tank is excited by seismic waves, the motion of free liquid surface, called sloshing, may occur inside the tank. When the high-amplitude sloshing occurs, the free liquid surface collides with the roof of cylindrical tank, and the impulsive vertical load acts on the roof. In this study, the cause of this extremely large load was discussed by analyzing the CFD analysis result. As a result, it was showed that the previous weak roof collision deformed the liquid surface into a flat shape and the flat liquid surface collided with the roof. The phenomenon caused the extremely large load acting on the roof. From this result, it was clarified that the history of roof collision has a large influence on the vertical load acting on the roof.
池末 俊一*; 森田 英之*; 石井 秀和*; 佐郷 ひろみ*; 横井 忍*; 山本 智彦
Proceedings of ASME 2021 Pressure Vessels and Piping Conference (PVP 2021) (Internet), 8 Pages, 2021/07
本論文では、円筒形タンクの非線形スロッシング条件に対して、屋根に作用する垂直荷重と側壁に作用する水平荷重を評価できる新しい方法を提案した。この方法は、過去の研究で提案された液面レベルと速度の簡略化された方程式と、既存のモデルから変更された新しい圧力モデルの組み合わせである。この方法は簡略化された方程式で構成されているため、CFD解析のような長い計算時間は必要ない。この方法の有効性は、CFDおよび試験と比較することによって確認した。そして、その結果から、この方法の改善に関する今後の課題が明らかとなった。
