摘要
提出了三维随机凹凸型碎石骨料生成方法,利用ANSYS/LS-DYNA有限元软件进行数值骨料投放模拟,得到了混凝土三维随机凹凸型碎石骨料几何模型。采用"基本单元模型"在投放区域生成立方体网格单元,结合新的空间点与随机多面体空间相对位置判定方法,判定出各单元材料属性,最后生成混凝土三维随机凹凸型碎石骨料有限元模型。以上混凝土细观有限元模型生成方法较好地控制了骨料粒径、数量和级配,生成的数值模型中骨料体积率在55%左右,处于真实混凝土骨料体积率的范围中。生成的数值骨料与真实碎石骨料形状接近。提出的细观混凝土有限元模型为对混凝土力学性能进行细观数值研究奠定了基础。
A practical method for 3 D modeling of concrete aggregates with arbitrary shapes was put forward in this paper. Polygon aggregates were packed by using ANSYS/LS-DYNA infinite element analysis software. Hexahedron mesh was done to the packed zone. The relative space position of point and polyhedron was analyzed with the new method, by which the material properties of all the elements were defined. Finally, three-dimentions numerical model of mesoconcrete with arbitrary shapes was established. Based on the above method, the quantity, the size, and the gradation of aggregates are effectively controlled, the aggregate content to be generated will be about 55%, which can meet the re quirement of full-gradation concrete simulation. The shape of numerical samples of meso-aggregate generated is similar to real aggregate. The mesoscale numerical model of concrete lays solid foundations for further study on static and dynamic mechanical performance of concrete in the mesoscopic level.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第12期89-94,121,共7页
Journal of Wuhan University of Technology
关键词
混凝土
细观模型
随机凹凸多面体
骨料
concrete
mesoscale model
random convex polyhedron
aggregate
