This paper describes experimental studies on the motion, mooring tension and structural responses of a typical semisubmersible in regular waves. A 1/50-scale structural dynamic model of two-pontoon type was made of acryl and the tank tests were carefully carried out. The measured platforms motions of the model were compared with calculations and close agreement was obtained. As to the structural responses the measured values of the test model agree approximately with the calculated results of a full-scale model. The close experimental results of structural responses presented here are expected to be valuable for the design of similar types of semisubmersibles.

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