摘要
采用非线性有限单元法 ,将各种管单元局部损伤进行有限元网格细分 ,通过刚度矩阵的静力凝聚方法 ,将损伤单元统一为等效的非线性梁单元 ,然后再与整体平台结合进行重分析 ,获得损伤后平台的极限强度。本方法对局部损伤的形式不附加任何限制 ,并可方便地求解整体结构的后屈曲破坏结果 ;准确地反映了损伤所引起的弯曲与轴向耦合刚度的变化。
In this paper,nonlinear finite element method is used to simulate various local defects of tubular members as equivalent nonlinar beam elements.This procedure can be applied to any form of local damage deformation with no additional limitation.It is rather convenient to implement with nonlinear finite element program to yield post collapse result of the whole structure.The equivalent beam model can reflect the nonlinear characteristics of compressing stiffness with change of loads acting on the damaged member.A computer program was developed to predict the load deflection behaviors,equivalent nonlinear beam stiffness for damaged tubular member and to calculate the ultimate load.post collapse curve of the whole offshore platform.
出处
《中国海洋平台》
2001年第3期5-11,共7页
China offshore Platform