浮遊式海洋構造物の洋上接合に関する技術開発 : その2 相対運動と衝撃荷重

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If an offshore structure is so large that it cannot be constructed in a dock, as will be expected in the near future, we have to divide it into several unit structures for construction and assemble them into one structure on the sea. But there exist various difficulties which prevent us from connecting the unit structures with each other on the sea, because they are exposed to environmental external forces. At the 60th biannual meeting of THE WEST-JAPAN SOCIETY OF NAVAL ARCHITECTS the authors showed that the wave forces and moments acting on the joints of an offshore structure composed of several unit structures could be estimated fairly precisely using a simple numerical method. On this paper the focus is on a transition period in which unit structures edge in with each other in order to be connected. At this stage relative motions of the unit structures and impact loads which will act on connecters (see Fig. 2) that are to restrict the relative motions have to be investigated. Experimental works were done for this purpose. The vertical relative motion of two unit structures at a connecting side in regular waves had a maximum value when the wave frequency coincided with the natural frequency of pitching motion of one unit structure because the corresponding wave length was nearly twice as long as the length of one unit structure. The impact loads which acted on connecters had a maximum value at the same frequency. Except at or around that frequency the relative motion and impact loads decreased very sharply. The maximum value of the impact loads was relatively small for impact. It is probably due to the relatively low stiffness of the upper deck of model units.
社団法人日本船舶海洋工学会の論文
1981-08-27

浮遊式海洋構造物の洋上接合に関する技術開発 : その2 相対運動と衝撃荷重

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