船体结构极限强度的影响参数与敏感度探讨  

Influence Parameters and Sensitivities for Ultimate Strength of Ship Structures

作　　者：白勇 徐向东[2] 崔维成[2] 

机构地区：[1]挪威斯塔万格大学 [2]中国船舶科学研究中心

出　　处：《船舶力学》1998年第5期35-43,共9页Journal of Ship Mechanics

摘　　要：本文采用非线性有限元方法计算了船体结构在两种失效模式下的极限强度：一是加筋板格的非线性失稳极限强度；二是船体在中拱及中垂弯曲下的总纵屈服极限强度。较全面系统地探讨了计算中各种因素对第一种极限强度的影响，并对这两种极限强度中的主要影响参数，包括屈服应力、杨氏模量、初始缺陷、焊接残余应力、板厚等变化的敏感度作了计算，为船体结构的可靠性分析与设计提供了科学依据。Ultimate strength of ship structures with two kinds of failure modes is calculated using nonlinear FEM. One is nonlinear buckling strength of stiffened panels and the other is longitudinal yielding strength of ship structures subjected to hogging and sagging bending moment.The influences of all parameters on the ultimate strength are studied using a stiffened panel example and foe sensitivities of the main parameters, including yielding stress, young's modulus, initial deformation, welding residual stress, thickness of plates etc., to the two kinds of ultimate strengths are calculated. These results provide a scientific basis for the reliability - based analysis and design of ship structures.

关 键 词：船体结构 极限强度 影响系数 敏感度 可靠性 

分 类 号：U661.43[交通运输工程—船舶及航道工程]