A single mooring system with sag-extensibility and flexural rigidity applied to offshore platform |
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| Authors: | M-CTsai Hsien Hua Lee Jun-Yen Lee S-SHsiao |
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| Institution: | 1. Department of Marine Environment and Engineering, National Sun Yat-sen University,Kaohsiung 80424, China
2. Department of Harbor and River Engineering, National Taiwan Ocean University,Keelung 20224, China |
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| Abstract: | Floating platform system has been extensively used in ocean exploitation, particularly for a tension-leg platform (TLP) system in deep water. Most of the TLPs are multi-mooring systems, where multi-joints are connected to the tension-legs so that the platform is not allowed to twist freely and may subject to enormous force induced by large incident waves in the weak-direction of the structure. This study aims to exploit a single moored offshore platform system that may attract less force and can be operated with less effort. In our analysis, in addition to mechanical properties of the tether, two important properties are also taken into consideration for the single mooring tether with expanded cross sectional dimension and utilization of stronger material, namely, the sag-extensibility and the flexural rigidity. Finally, the dynamic structural behavior produced by the mechanical effects on the new system is investigated and compared with that of traditional design while the wave-structure interactions of large body are also accounted for. Our study finds that the neglect of sag-extensibility or the flexural rigidity of large, strong mooring cable may result in a conservative but not necessarily safe design. |
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| Keywords: | tention leg platform (TLP) single mooring platform system flexural rigidity sag extensibility wave-structure interactions |
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