In this paper a submerged floating structure with tension legs is dealt with, the hydro-elastic response of which in long waves is investigated as a part of basic studies on marine space utilization structures. The analytical method is applied to the submerged floating structure. Then, the hydro-elastic characteristics of a floating structure model with a submerged plate and tension legs in regular long waves are investigated numerically. Next, in order to demonstrate the validity of theoretical results an experimental study is carried out for a basic model in regular waves. It was found that experimental results for the frequency response amplitude are in good correspondence to theoretical results in the low frequency range. Finally, characteristics of hydro-elastic responses of a 1,000m-class submerged floating structure under trial design are also investigated applying the above method.
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