混凝土非线性有限元分析中的网格尺寸效应  

Mesh size effect in nonlinear finite element analysis of concrete

作　　者：崔焕平[1] 崔燕平[2] 王宗敏[2] 

机构地区：[1]河南财经学院工程管理系,河南郑州450002 [2]郑州大学环境与水利学院,河南郑州450002

出　　处：《混凝土》2007年第6期27-29,共3页Concrete

摘　　要：对混凝土结构进行非线性有限元分析时,存在网格尺寸效应。通过对简支梁划分不同网格尺寸进行分析,讨论了单元尺寸大小对荷载-位移关系及极限荷载等计算结果的影响,提出了把极限拉应变作为网格尺寸的函数,以保证混凝土开裂单位面积吸收的能量唯一,从而有效地消除混凝土非线性有限元分析中的网格尺寸效应。The problem of mesh size effect is encountered in nonlinear finite element analysis of concrete structures.The influence of mesh size on different behavior aspects of simply supported concrete beam including the load-displacement and ultimate load are discussed with different mesh size.A simple formula for calculating the ultimate tensile strain of concrete was proposed.The ultimate tensile strain as a function of the element size,to sure the energy release rate is constant.The proposed model has eliminated the mesh size effect in non-linear finite element analysis of concrete effectively.

关 键 词：混凝土 有限元 网格尺寸 极限拉应变 

分 类 号：TU528.01[建筑科学—建筑技术科学]