Abstract
This paper presents the findings of a study on the air gap below deck of a typical six-column, double-pontoon semi-submersible in deep water. The writers present a method to predict the extreme air-gap by establishing the distribution of extreme air-gap response. In the case of linear incident wave, the proposed air-gap distribution suggested a better fits compared with that given by Rayleigh distribution. Moreover, the proposed approach is found to be an effective way to predict air-gap extremes within a specified duration. As a comparison, the fractile-based method cum Gumbel distribution is also applied to the same floating structure. Comparisons of the numerical results from these 2 different approaches show strong agreement in extreme air-gap response below deck.
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