Elastic Buckling of Pontoons of Single Deck Floating Roofs subjected to Circumferential Compressive Load

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  • 圧縮を受けるシングルデッキ形浮屋根ポンツ-ンの弾性座屈強度
  • アッシュク オ ウケル シングル デッキケイ ウキヤネ ポンツーン ノ ダンセイ ザクツ キョウド

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Abstract

The 2003 Tokachi-Oki earthquake caused severe damage to oil storage tanks due to liquid sloshing. Seven single-deck floating roofs had experienced structural problems as evidenced by sinking failure in large diameter tanks at the refinery in Tomakomai, Japan. The pontoons of the floating roofs might be buckled due to circumferential bending moment during the sloshing. The content in the tank was spilled on the floating roof from small failures which were caused in the welding joints of pontoon bottom plate by the buckling. Then the floating roof began to lose buoyancy and submerged into the content slowly. The authors had reported the buckling strength of the pontoons subjected to circumferential bending load and to both circumferential and radial bending load in the previous papers. This paper presents the buckling strength of the pontoons subjected to both circumferential bending load and circumferential compressive load. The axisymmetric shell finite element method is used in the analysis. Linear elastic bifurcation buckling analysis is carried out and the buckling characteristics of the pontoon both with and without ring stiffeners are investigated.

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