船体梁极限强度的近似计算

船体梁的总纵强度是反映船舶结构安全可靠的最基本的强度指标。船体结构极限强度评估对于船舶结构初步设计、使用、维护和维修都非常重要，因此船体梁极限强度研究成为近几十年来船舶工程界的热点研究课题之一。到目前为止有两种典型的加筋板和船体梁的极限强度分析方法，它们是直接计算法和逐步破坏分析法。本文基于加筋板单元的平均应力应变曲线和逐步破坏分拆方法，提出了加筋板和船体梁极限强度的简化分析方法，考虑了初始挠度和残余应力对加筋板单元极限强度的影响。数值结果表明，采用本文简化方法得到的结果与有限元计算结果或其它逐步破坏分析结果比较符合。

Estimation of Ultimate Strength of Ship's Hull Girders

The longitudinal strength of a ship' s hull is the most fundamental strength for ship structures.The assessment of the ultimate strength of a ship structure is very important not only for the initial designbut also for the operation, maintenance, and repair of the structure. Consequently the ultimate strength ofship' s hull girders has been an area of active research domain in the last several decades. There exist twotypical methods to assess the ultimate strength of stiffened panel and hull girder. One is the direct formula-tion and the other is the progressive collapse analysis. In this paper, a simplified method is presented to pre-dict the ultimate strength of stiffened panel and hull girder based on the basic stress - strain relationship ofstiffened plate columns and the progressive collapse analysis. The model accounts for the effect of initial de-flections and residual stresses on the ultimate strength of stiffened plate columns. The numerical examplesshow that the results obtained from the present method are in good agreement with numerical results by finiteelement analysis and the different progressive collapse analysis.