水利学报2019，Vol.50Issue(4)：448-462,15.DOI:10.13243/j.cnki.slxb.20181061
基于内聚力模型的混凝土细观拉压统一数值模拟方法
A unified meso-scale simulation method for concrete under both tension and compression based on Cohesive Zone Model
摘要
Abstract
The application of Cohesive Zone Model is extended to concrete compression fracture simulation at meso-scale. The unity of concrete tension and compression has been realized. Referring to the previous experimental study and the characteristic of Cohesive Zone Model, different fracture behavior under tension and shear, mixed fracture criterion is defined to cohesive elements, and global interaction behavior is defined to the model. Specimens with different mesh accuracy are modeled for mesh sensitivity study. The cause of mesh sensitivity in concrete tension and compression simulation are discussed. The whole deformation process of concrete under tension and compression is simulated. A parametric study of fracture energy, interface strength, aggregate shape and aggregate material properties is conducted. The influence of concrete fracture and interaction behavior on the whole mechanic properties are discussed based on the analysis of failure mode and mechanic performance. The study results show that the compression simulation of concrete is more sensitive to the mesh's precision compared with tension simulation, and for the coarse mesh would restrain the internal force redistribution of concrete. The mixed-mode fracture partial to mode I fracture is the main failure mode of concrete under uniaxial tension. The mixed-mode fracture energy caused by the difference of mode I and mode II fracture energy comprises 48.2％ of the whole tension fracture energy of the specimen. The smoothness of aggregate has a positive effect on uniaxial tension strength, while it would reduce the mechanical occlusion between particles and lead to a higher strength degradation rate.关键词
混凝土/细观/数值模拟/内聚力模型Key words
concrete/meso-scale/simulation/Cohesive Zone Model分类
建筑与水利引用本文复制引用
熊学玉,肖启晟..基于内聚力模型的混凝土细观拉压统一数值模拟方法[J].水利学报,2019,50(4):448-462,15.基金项目
国家自然科学基金项目(51578400,5178328) （51578400,5178328）
