engleski

Strength analysis of large container ships by using a beam model according to the classification rules

The structural design of large container ships, due to their lower torsional stiffness, should be based on hydroelastic analysis. This problem is not yet completely investigated and therefore quasi static approach for strength analysis is still used. For that purpose beam structural model or 3D FEM model can be employed, with rather simple rule formulas for determining wave sectional forces. In this paper standard procedure for structural design of large container ships ordinary used nowadays is described. Then, application of an advanced beam model, developed for hydroelastic analysis, is illustrated for strength analysis as a main part of the design procedure. Sectional forces specified by classification rules are used for determining distribution of wave load along the beam model. The results obtained by the modified program DYANA for static analysis are twist angle and its variation, which may be further used for cross-section stress distributions calculation as well as for determining hatch deformations important for container safety.

Container ship; Beam model; Rule based strength assessment

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