冲击荷载作用下混凝土缺陷模型细观损伤演化定量分析  

Quantitative analysis for mesoscopic damage evolution of a concrete model containing defects under impact load

作　　者：覃源[1] 柴军瑞[1,2] 党发宁[1] 

机构地区：[1]西安理工大学陕西省西北旱区生态水利工程重点实验室,西安710048 [2]三峡大学土木水电学院,湖北宜昌443002

出　　处：《振动与冲击》2014年第11期172-177,共6页Journal of Vibration and Shock

基　　金：水利部公益性行业科研专项(201201053-03);国家自然科学基金项目(50879069);教育部博士点基金(20096118110007);西安理工大学博士科研启动基金(106-211306);陕西省重点科技创新团队(2013KCT-15)

摘　　要：通过对传统数字混凝土模型的改良,建立了带有内部缺陷的数字混凝土模型,在对内部缺陷分区的基础上,结合双折线损伤演化模型,对试件在三种速率冲击荷载作用下的细观损伤、应力和应变的分布规律进行了讨论,并对结果进行了定量描述,建立了混凝土材料细观损伤与宏观裂纹演化之间的联系,为混凝土材料的物理试验和在工程中的应用起到了辅助作用。A numerical model of concrete containing internal defects was established based on the traditional random aggregate model.The model was partitioned into three parts,and based on the conduplicate-line damage evolution model,the distribution law of damage,strain and stress under three different kinds of impact load was discussed,and the results were described quantitatively.The relationship between mesoscopic damage and macroscopic crack evolution was built.The results provided a reference for both physical tests and engineering application of concrete material.

关 键 词：混凝土 冲击荷载 数值试验 内部缺陷 三点弯试验 

分 类 号：TU528[建筑科学—建筑技术科学]