波浪中における構造応答と疲労解析(浮遊式海洋構造物の実海域実験その2 研究報告)

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Recently some concepts of very large floating structures have been proposed for one of applications such as floating airports and floating cities. Most of such large structures are supported by a large number of columns piercing the free surface. Therefore the fatigue analysis and the hydrodynamic interaction between multiple columns are importantconsiderations for this kind of structures in waves. At-sea experiment using prototype model named "POSEIDON" had been carried out for inspections of various elemental technologies concerning the construction of such very large structures from 1986 to 1990 at the coast of the Japan Sea. The POSEIDON is a semisubmersible offshore structure with l2legs that was built as a part model of a huge structure. In this experiment,strains induced by waves have been measured at 12 points of main structural members which are related to the fatigue strength while there have been various another measuring items. This paper describes the effects of the hydrodynamic interaction between multiple legs on structural responses in waves and that of some factors on the estimation of the fatigue life of the structural members. Hydrodynamic forces acting on the structure have been estimated by the three dimensional source distribution method taking the interactions into account. Further the results of hydrodynamic calculations were applied to the structural analysis. Structural response functions were solved in the frequency domain by F.E.M.. The effect of the hydrodynamic interaction against structural responses was confinned by comparison of predicted results with experimental data. Both the spectral method and the discrete method were used in order to analyze the fatigue life of structural members. Particularly, the wave directional function was taken into account in the spectral method. From the results of studies described above, we may conclude that the hydrodynamic interaction and wave spectrum shapes dependent on frequency and directional functions respectively influence considerably on the prediction of the fatigue life.
独立行政法人海上技術安全研究所の論文
1994-12-28

波浪中における構造応答と疲労解析(浮遊式海洋構造物の実海域実験その2 研究報告)

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波浪中における構造応答と疲労解析(浮遊式海洋構造物の実海域実験 その2 研究報告)

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波浪中における構造応答と疲労解析(浮遊式海洋構造物の実海域実験その2 研究報告)