A Method for Estimating Collapse Strength and Reliability of VeryLong Box-type Floating Platforms under Extreme Wave Loads

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  • 極限波浪中における長大箱型浮体構造の崩壊強度評価の一方法
  • キョクゲン ハロウ チュウ ニ オケル チョウダイ ハコガタフタイ コウゾウ ノ ホウカイ キョウド ヒョウカ ノ イチ ホウホウ

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Abstract

This paper deals with a method for estimating collapsing behavior and reliability of very long box-type floating platforms (VLFP) under extreme wave loads. First, a simplified estimation method is presented for collapsing behavior of VLFP by using hexahedral element models. The dominant limit state modes are obtained from a previously developed system combined with finite element method and plastic node method using hexahedral element models. Next, a simplified estimation method is shortly introduced for the dynamic response of the structure in irregular waves. Finally, the features of the collapsing behavior and reliability level are investigated by a numerical example applied to a 5,000m-class VLFP under trial design. Effects of combined bending moment, shearing force and lateral pressure on dominant collapse modes and reliability levels are also investigated.

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