摘要
混凝土细观力学是研究混凝土材料性质的重要方法之一.首先,采用被占区域剔除法生成骨料,该方法能较快地完成高含量骨料的混凝土细观力学模型生成.然后,针对目前混凝土细观力学网格剖分的难题,提出了单元切割法,解决了全级配高含量骨料有限元网格剖分的难题,并且所产生的网格单元形状比较规则均匀.最后编写了三维细观混凝土试件等效弹模的数值计算程序.算例给出了湿筛二级配、三级配以及全级配混凝土的细观力学模型,并将单元切割法产生的网格应用于混凝土细观力学等效弹模的计算,数值计算结果与其他数学方法的结果接近,表明该方法具有较好的实用性.
Mesomechanics is one of the important methods for the concrete material mechanics research. Firstly, the method of excluding the occupied space is used to generate concrete aggregate; and then high content aggregate of concrete model is quickly obtained through the method. In view of the present mesh discretization problem of mesomechanics of concrete, a new method called element cutting method is proposed, which solves the finite element mesh discretization problem of high content aggregate of fully-graded concrete; and the generated elements are uniform and regular. Finally, a three-dimensional equivalent elastic modulus estimate program for fully-graded concrete is compiled. The wet sieve two-graded concrete model, three-graded concrete model and full-graded concrete model are shown in the numerical example. The generated mesh is applied to calculate the equivalent elastic modulus of concrete; the numerical calculation results are in agreement with other mathematical methods, so as to show that the method could have good practicability.
作者
丁建新
陈胜宏
DING Jianxin CHEN Shenghong(Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China)
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2017年第5期641-647,共7页
Engineering Journal of Wuhan University
基金
国家自然科学基金项目(编号:51079109)
中央高校基本科研业务费专项资金资助(编号:201120602020003)
关键词
水工结构
细观力学
网格剖分
单元切割法
等效弹模
hydraulic structure
mesomechanics
mesh discretization
element cutting method
equivalentelastic modulus
