垂直地震動による緊張係留浮体の応答

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The tension leg platform (TLP) has been studied since the 1970s by Paulling et al., but has not been used so practically excepting Hutton TLP in the North Sea. The main reason is reliability on the strength of the tether. Therefore, most studies on TLP have related to the strength of the tether. The wave response of TLP and the tension of the tether were studied by Paulling, and Yoshida. Since TLP has been said to be an aseismatic structure, the earthquake force has not been considered on designing as an external force to the tether. It is true that the horizontal component of the earthquake can be ignored because the flexural stiffness of the tether is nearly zero. However, the tension fluctuation of the vertical component of the earthquake is an important factor on designing. Studies on the earthquake load of TLP is only little described in Penzien's paper, but it has not yet been clarified. The authors have made for years theoretical and experimental investigations on the earthquake response of TLP. In TLP motion analysis, the problem is usually simplified by idealizing the tether as simple springs. While this approximation appears to be generally adequate for shallow waters. The relative weight ratio (tether/platform) increases very rapidly as the water depth increases. Thus, it is necessary to treat the TLP under the earthquake as a continuous system rather than as a rigid body. In this study, motion equations on a tension leg buoy (TLB), taking the tether weight into consideration, were prepared to clarify the earthquake response.
社団法人日本船舶海洋工学会の論文

垂直地震動による緊張係留浮体の応答

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