Ultimate Strength of Composite Steel-Concrete Structure of Sandwich System

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  • 鋼板とコンクリートから成るサンドイッチ式コンポジット構造の最終強度
  • コウハン ト コンクリート カラ ナル サンドイッチシキ コンポジット コウゾ

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Recently, various kinds of arctic offshore structures have been constructed corresponding to the promising oil industry.<BR>In designing such structures, the designers have to pay particular attention how to overcome the ice loads.<BR>One of solutions for strength against ice loads is the application of composite steel-concrete structure.<BR>In this paper, selecting five feasible composite models where concrete is placed inbetween steel plates, the elastic-plastic behaviour and their ultimate strength are investigated by both theoretical and experimental approaches.<BR>The theoretical analysis has been performed by finite element method which is newly developed to incorporate non-linearity of concrete and interaction between steel and concrete.<BR>In addition, thermal fatigue, i. e. recurrence of freezing and thawing of concrete, is experimentally investigated anticipating real environmental condition in arctic area.<BR>As the results of our investigations, followings can be concluded.<BR>1) Our newly developed computer program can predict the elastic and plastic behaviour and ultimate strength of composite structure with due accuracty.<BR>2) Most benefitial combination of steel and concrete can be found.<BR>3) The recurrence of freezing and thawing do not give an appreciable influence on the strength of structure.

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