Due to the limited enclosed area, container ships with large openings indeck are subject to torsional failure as well as bending failure.Specifically, both moments contribute measurably to the ultimatestrength in the scenario of ships travelling in oblique seas. This paperfocuses on the ultimate strength of container ship subject to combinedmoments of bending and torsion, and the modelling scope is limited tothe longitudinal structures between two adjacent frame girders toreduce the calculation cost. The limit state of failure for a 3100 TEUcontainer ship is derived through Minimum Square Error (MSE)technique based on a series of Nonlinear Finite Element Analysis(NFEA). On the other hand, corrosion takes place in the life cycle ofcontainer ships, resulting in degradation of structural strength. Thus,corrosion effects with uncertainty on ultimate strength regarding topure bending moments, pure torsional moments and combination ofboth are studied, which can be a useful reference for the scheduledmaintenance of container ships.
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