Author(s): Trine Lundamo; Basile Bonnemaire; Arnor Jensen; Ove T. Gudmestad
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Abstract: Studies on moored vessels in ice usually report on the mooring loads which reflect the structural response of the vessel and rarely on the actual ice load. In the present study, results from model tests of an Arctic Shuttle barge at the HSVA ice tank in 1999 are reanalyzed. A numerical model of the moored vessel is established to back-calculate the ice load applying on the vessel in both heave and surge. As the heave of the vessel was not measured, it was backcalculated using a numerical model of the mooring. The implementation of the dynamic model seems to give realistic time series for the ice load applying on the vessel. The surge components of the mooring and the ice loads present similar trends, but the vertical loads differ a lot in magnitude. The statistical properties of the signals differ as well. The longitudinal ice load presents a larger standard deviation, which is increasing during ice ridge interactions. The distribution of the measured and the calculated loads are also compared.
Year: 2008