Experimental Study on Sloshing Behavior of Floating Roofs by using Small-scale Cylindrical Tank

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  • 小規模タンクを用いたスロッシング時の浮き屋根の揺動に関する実験的研究
  • ショウキボ タンク オ モチイタ スロッシングジ ノ ウキヤネ ノ ヨウドウ ニ カンスル ジッケンテキ ケンキュウ

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The Tokachi-oki Earthquake (M8. 0) caused the sever damage of oil storage tanks at Tomakomai such as fires and sinkage of floating roofs. The cause of damage is liquid sloshing of oil storage tanks excited by the long-period strong ground motions. It is thought that the pontoons of oil storage tanks of 40m-diameter were damaged by the first sloshing mode and tanks of 80m-diameter suffered damage to the intersection parts between the deck and the pontoons. <br> After the earthquake, the technical standard of the Fire Service Act regarding the sloshing of floating roof tanks were revised in consideration of the circumstances of damage of the floating roof tanks. <br> However, it is difficult to say that dynamical behavior of sloshing of a floating roof due to liquid sloshing was not verified thoroughly with a real-scale storage tank. Especially, there were not so many researches about sloshing behavior considering real floating roof, which is not rigid but elastic. <br> There is more need to examine the formulations of the sloshing with large wave height and the effect of the second sloshing mode when floating roofs are involved<br> In this study, in order to examine the formulations of the behavior of non-linear liquid sloshing with floating roof and the deflection of a deck plate by the second sloshing mode of oil storage tanks defined in the Fire Service Act, we conducted a shaking experiment by using a large shaking table and a small-scale floating roof tank of 7. 6m-diameter, which is comparatively large tank however. <br> We concluded that the formulations of the behavior of non-linear liquid sloshing and the deflection of a deck when floating roofs are involved are adequate in considering the results obtained from the experiments.

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