Sloshing response analysis of a floating roof of oil storage tank using nonlinear finite element analysis code

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  • 非線形解析コードによる石油タンク浮屋根のスロッシング応答解析
  • ヒセンケイ カイセキ コード ニ ヨル セキユ タンク ウキヤネ ノ スロッシング オウトウ カイセキ

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Due to long period ground motion, oil storage tanks were severely damaged in recent years, especially in the 2003Tokachi-Oki earthquake. After that, some sloshing response analyses of floating roofs using nonlinear commercial FEA code LS-DYNA have been reported. A part of the calculated results are adopted as a technical justification of the revised technical standards of the Fire Service Law regarding the sloshing with floating roof. But there are unknown factors in the analyses such as the damping ratio, boundary conditions and the formulation of the elements. It is not well known which parameter has significant effects on the damping in the sloshing calculation and how much is the value of damping ratio. In this paper, the effects of several parameters which are considered to have influence on damping in the analyses are investigated. Sinusoidal excitation analyses with varying parameters were performed with a finite element model of a 100, 000kl oil storage tank with a floating roof. Parameters investigated in this research are hourglass viscosity coefficient, time step and the amplitude of excitation. Of these parameters, the value of hourglass viscosity coefficient was found to have most significant effect in the calculation of sloshing. On that basis, several earthquake response analyses with the seismic wave of Tokachi-Oki earthquake were performed with varied hourglass viscosity coefficients and the result was compared with the ones which have been already reported. The behavior of the floating roof, such as ovalization of the pontoon in the analysis, was similar to the reported results, but the responses of the floating roof and liquid were smaller than reported results with known damping ratio. Because the results of LS-DYNA give smaller response, some precautions when applying LS-DYNA to sloshing analyses are shown.

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