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  • 标题:セミサブ型海洋構造物の疲労解析について
  • 本地全文:下载
  • 作者:沢柳 政弘 ; 福岡 哲二
  • 期刊名称:日本造船学会論文集
  • 印刷版ISSN:0514-8499
  • 电子版ISSN:1884-2070
  • 出版年度:1982
  • 卷号:1982
  • 期号:152
  • 页码:450-458
  • DOI:10.2534/jjasnaoe1968.1982.152_450
  • 出版社:The Japan Society of Naval Architects and Ocean Engineers
  • 摘要:

    There are many semi-submersible offshore structures working in deep waters in the world and many semi-submersible rigs have been built in Japan. Still more, a design of a semi-submersible rig with larger variable deck load has been required and planned for activities in deeper and far waters, and a design condition for a semi-submersible offshore structure has become more severe. Consequently, the importance of a fatigue strength evaluation has been increasing. In this paper, first of all, a fatigue analysis is performed for a semi-submersible rig with 3, 400 tonage variable deck load by a direct calculation method. The direct calculation consists of a motion analysis in regular sine waves, a 3-dimensional frame work analysis and a long-term prediction of stress amplitudes induced in each members of the structure. Subsequently, design wave conditions are proposed for the semi-submersible rig, and the results obtained by the design wave method are compared with the results of the direct calculation. As a result, it is shown that the stress amplitudes calculated for the design wave conditions well correspond to the maximum expected values of stress amplitudes for the probability of 10-8 obtained by the long-term prediction, and the average shape parameter of the longterm distributions of the member stress amplitudes is 1. 1 when Weibull distributions are.applied to.

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