双体船大开口角隅节点疲劳强度优化方法研究

摘要

与同样吨位的单体船相比，双体船具有更大的甲板面积、更大的舱容。在双体船大开口角隅位置，由于应力集中，更容易引起疲劳损伤的迅速积累。因此，在结构设计中，角隅位置的疲劳强度一直是工程界关心的部分。本文使用谱分析方法研究双体船角隅节点的疲劳强度。在疲劳校核基础上对角隅位置进行优化设计，研究增加板厚和增设肘板对角隅处疲劳强度的影响。在此基础上分析不同优化方法的适用性，为船舶设计与安全性能提供适当的建议。%Compared to mono hull ship, the catamarans with the same tonnage have many advantages such as bigger deck area and bigger cargo cubic. The stress concentration at the corner spots of catamaran's large opening, easily result in the rapid accumulation of fatigue damage. Thus, fatigue strength at the corner spots causes a lot of concern of engineering in the ship structure design. Based on fatigue strength assessment results, optimization methods are considered to research the effect of adding plate thickness or bracket to fatigue strength of corner spots. Then the appropriation of these different meth-ods is analyzed to provide references for the catamaran's design and safety.