Improvement of Deformation Analysis for a Single-Deck Floating Roof under Accumulated Rain Water Condition

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  • シングルデッキ形浮屋根の雨水滞留による変形解析の高精度化
  • シングルデッキケイ ウキヤネ ノ ウスイ タイリュウ ニ ヨル ヘンケイ カイセキ ノ コウセイドカ

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Abstract

The floating roofs are used in large aboveground oil storage tanks to prevent evaporation of the content. The single-deck floating roofs, which are considered herein, consists of a thin circular plate called a deck attached to a buoyant ring of box-shaped cross section called a pontoon. Under the accumulated rain water condition, the deck is deflected largely, and both its edge part and the pontoon are compressed circumferentially. Since the load condition due to the rain water depends on the deflected deck shape, it is difficult to find the unique equilibrium condition. This paper describes the deformation analysis for the single-deck floating roofs under the accumulated rain water condition using the axisymmetric shell finite element method. The load incremental method, in which the equivalent nodal forces due to the rain water converges to identify to the rain water load derived from the deflected deck shape, is used.

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