As a new high performance shipform, the structural form of trimaran is special and the stress concentration of its cross-deck structure is serious. According to the Rules for Classification of Trimaran Ships developed by Lloyd’s Register, the global finite element model of a trimaran is built. Main factors such as Thickness of bulkhead and wet deck, transitional forms and strengthening forms, which affect the stresses at local details are compared and discussed. Then the best structural form of trimaran cross-deck is given. The result can offer the reference for the trimaran’s design and development.

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