船体结构总纵极限强度的简化逐步破坏分析  

A Simplified Progressive Collapse Analysis of Ultimate Longitudinal Strength of Ship Structures

作　　者：何福志[1] 万正权[1] 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《船舶力学》2001年第5期21-35,共15页Journal of Ship Mechanics

摘　　要：本文基于梁 -柱理论、理想弹塑性假设、平面假设和塑性铰理论建立了拉伸和压缩加筋板单元的标准应力 -应变关系曲线 ,开发了船体结构总纵极限强度的简化逐步破坏分析方法。应用该简化方法编制的计算程序较为详细地分析了五条船截面/箱型梁模型的总纵极限强度 ,结果表明本文开发的简化逐步破坏方法和计算程序是正确可靠的 。A simplified procedure is developed for predicting the ultimate strength of hull girder based on the basic progressive collapse method. The normalized stress - strain relationship of structural element is introduced by applying beam - column theory, elastoplastic assumption, and plastic joint theory. The total bending moment is obtained by integrating the contribution of all elements, and the ultimate bending moment is defined by the moment corresponding to the point with zero or negative slope in the moment - curvature relationship. The complete procedure has been coded into a FORTRAN program and tested against four ship/box girder sections. The results obtained from the present program appear to be quite satisfactory. It shows the advantage of present method to predict the ultimate strength of hull girder in ship design.

关 键 词：船体结构 极限强度 应力-应变关系 结构设计 结构应力 

分 类 号：U661.43[交通运输工程—船舶及航道工程]