Linear and Nonlinear Analysis of the Thin Plate Block for a Cruise Ship's Superstructure during Lifting
The linear,material nonlinear,geometric nonlinear and double nonlinear methods were used to analyze the stress and displacement for a typical block of a cruise ship's thin plate structure.Based on the reinforced structural model,the ultimate outfitting/structure weight ratio was calculated for linear finite element method could be applied.The results showed that the effect of double nonlinearity should be considered in the lifting analysis of thin plate structure;the result of linear calculation is larger than that of double nonlinear calculation,so the result of linear calculation will cause structure more secure for reinforce-ment,which is unfavorable to cost control.The maximum displacement of the structure is determined by the local stiffness of the joint between the lifting eye and the block structure.The weaker the local stiffness at the joint,the more obvious the geometric nonlinearity of the structure.If the reinforcement at the joints of lifting eyes and the block are sufficient,linear analysis can be used when the outfitting/structure weight ratio of the block is less than 103%,but the stress is larger about 10%.
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