摘要
现有弥散裂纹模型在模拟混凝土细观干缩开裂时,存在收敛性差、易出现裂纹"误判"的局限。针对此不足,该文提出了等效断裂能开裂破坏准则,用以改进弥散裂纹模型;并应用允许材料破坏的有限元显式解法,模拟了单骨料、随机骨料结构混凝土试件的二维干缩开裂,所得裂纹分布与对比试验观察结果基本吻合,显示了改进弥散裂纹模型在混凝土干缩开裂模拟中的适用性。
The traditional fracture energy cracking criterion in a smeared cracking model,with the limitation of poor convergence and misjudgement of micro-cracks,is not applicable in the meso-level simulation of drying shrinkage micro-cracking in concrete.A modified smeared cracking model with an equivalent fracture energy cracking criterion is proposed and employed in the simulation of drying shrinkage micro-cracking in concrete specimens using an explicit method available in the commercial software ABAQUS.The micro-crack patterns from simulations of single-aggregate and random-aggregate-structure specimens agree well with the experimental results,showing the applicability of the modified smeared cracking model in modeling the meso-level drying shrinkage micro-cracking in concrete.
出处
《工程力学》
EI
CSCD
北大核心
2011年第12期65-71,共7页
Engineering Mechanics
基金
国家自然科学基金项目(90715041)
十一五支撑计划项目(2008BAB29B05)
关键词
混凝土
干缩微裂纹
细观层次
等效断裂能
弥散裂纹
显式解法
concrete
drying shrinkage micro-cracking
meso-level
equivalent fracture energy
smeared cracking
explicit method
