Icebreaking trimaran is a new, promising concept, which is under development in Aker Arctic. As a part of this development project, the dimensioning loads for the cross-deck structure were evaluated. There is no previous experience of multihull ships operating in ice. Thus the dimensioning loads are derived from theoretical analyses and calculations based on measured full-scale ice loads. The loads and structural response are analysed for an example trimaran, which operates in the Baltic Sea. Global loads on the cross-deck are evaluated in icebreaking, beaching on an ice ridge, compressive ice and maneuvering. For comparison purposes the open-water loads are also estimated. Based on these calculated loads, stresses in the cross-deck are calculated and the dimensioning scenarios are selected. The results suggest that the cross deck structure of an icebreaking trimaran similar to the example ship can be feasibly built. The methods presented can be used to dimension the cross-deck of an icebreaking trimaran for a first-year ice conditions.
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