LAUSR

There have been a great demand for a suitable and convenient method in the field of buckling analysis of stiffened ship structures, which is essential to structural safety assessment and is significantly time-consuming. Modeling, buckling behaviors and ultimate strength prediction of stiffened panels were investigated. The modeling specification including nonlinear finite element model and imperfections generation, and post-buckling analysis procedure of stiffened plates were demonstrated. And a software tool using set-based finite element method was developed and executed in the MSC. Marc environment. Different types of stiffen panels of marine structures have been employed to investigate the buckling behavior and assess the validity in the estimation of ultimate strength. A comparison between results of the generally accepted methods, experiments and the software tool developed was demonstrated. It is shown that the software tool can predict the ultimate capacity of stiffened panels with imperfections with a good accuracy.摘要船体结构屈曲分析是其安全性评估的重要环节但步骤繁杂耗时, 船舶结构设计领域迫切需要一 种准确而简便的分析方法或工具。本文采用非线性有限元方法对加筋壁板的物理建模、屈曲分析和极 限强度预测进行研究。考虑壁板初始缺陷, 建立了整体加筋壁板的非线性有限元分析模型, 提出了一 种壁板后屈曲问题求解的建模和分析规范。基于MSC.Marc 软件平台, 开发了一种基于集合的壁板参 数化建模和屈曲分析的软件系统。采用不同类型的船体结构加筋壁板, 研究了壁板线性屈曲及后屈曲 行为, 并对非线性有限元求解屈曲问题的有效性进行了评估。将解析法、实验测试法以及本文所提出 方法进行后屈曲分析所获得的结果对比表明, 本文提出的壁板屈曲分析方法和开发的船舶结构屈曲分 析软件系统, 能够较准确地预测带有初始缺陷的壁板的极限强度。