摘要
为准确分析混凝土损伤开裂的跨尺度演化过程,提出了一种自适应宏细观递进有限元分析方法.将分析模型划分为单一宏观尺度和宏细观多尺度2个区域,建立自适应分析尺度转换准则以动态更新区域范围.通过自适应建立与宏细观多尺度区域内宏观积分点关联的耦合体积细观有限元模型,实现非均匀宏观网格条件下的宏细观递进有限元分析.基于提出的分区均匀化的宏观损伤表征方法,实现混凝土损伤演化的跨尺度模拟.利用ABAQUS用户材料子程序接口UMAT,编制计算程序.结果表明,自适应宏细观递进有限元分析的自由度数量和CPU耗时分别约为全细观数值模拟的8.35%和17.57%.所提方法可在考虑混凝土细观结构的前提下,实现混凝土损伤开裂跨尺度演化的高效模拟.
An adaptive macro-meso-scale hierarchical finite element(FE)analysis method was proposed to accurately simulate the evolution process of concrete trans-scale damage and cracking.The entire FE model was divided into the single macroscale region and the macro-meso-scale region.An adaptive criterion was put forward to dynamically update the scopes of the two regions.The macro-meso-scale FE analysis under the condition of irregular macro-mesh was carried out by adaptively generating the coupled volume meso-level models assigned to the macro-level integration points in the macro-meso-scale region.A partition-based homogenization scheme was presented to quantify concrete macro-damage and was utilized in the simulation of concrete trans-scale damage and cracking.The proposed method was numerically implemented by using the user material subroutine(UMAT)in ABAQUS.The results show that the number of degrees of freedom and the CPU time of the proposed method are only about 8.35%and 17.57%of those of the full mesoscale simulation,respectively.Therefore,the proposed method can realize an efficient simulation of the trans-scale damage and cracking of concrete with the consideration of its mesostructure.
作者
徐磊
姜磊
王绍洲
任青文
Xu Lei;Jiang Lei;Wang Shaozhou;Ren Qingwen(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Power China Kunming Engineering Co.,Ltd.,Kunming 650051,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第6期1052-1062,共11页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51739006,51979092,U1765204)。
关键词
混凝土
损伤开裂
宏细观
递进多尺度
自适应
concrete
damage and cracking
macro-meso scale
hierarchical multiscale
adaptive
