ABSTRACT
The increase of cruise ship tonnage causes the design load gradually close to hull girder ultimate strength. Therefore, evaluating residuals strength after collision and grounding damage becomes more important. However, at present it is difficult to find relevant research achievements and it is urgent to evaluate residual strength in design stage. In this paper, one cruise ship is selected as the research object with assuming a reasonable Damage extent. The finite element modeling method of whole ship is discussed and nonlinear finite element method is used to analyze the effect of collision and grounding damage on residual strength. And also, the influence of superstructures on the failure mode and failure sequence of hull girder is studied in detail. Then, considering the superstructures effectiveness the incremental iteration method is modified to evaluate cruise ship residual strength. At last, a principled method for determining the effectiveness value after collision and grounding damage is proposed, so as to provide reference for evaluating cruise ship residual strength in the early design stage.
