Numerical simulation of concrete aggregates with arbitrary shapes and its application

作者：Du Cheng Bin; Sun Li Guo

来源：Journal of Hydraulic Engineering, 2006, 37(6): 662-667+673.

• concrete
• arbitrary shape of aggregate
• extension
• convexity condition
• aggregate content
• numerical simulation
• failure

A practical method for 2-D and 3-D modeling of concrete aggregates with arbitrary shapes is presented. In this method the basic aggregates of the same grade are generated once only and randomly extended to generate aggregates with arbitrary shapes. In 3-D modeling, the sizes of aggregates of the same grade is assumed in Gauss distribution. The extension mode and convexity condition of the added aggregates are established according to the constraint that the surface area of polyhedron must be smaller than the limited area and the volume of aggregates outside of the extended surface must not be zero. The aggregates intersections are checked by the test of the sum of aggregates volumes. Corresponding software 2D-RAS and 3D-RAS are developed. It is found that, by means of this method, the aggregate content to be generated in 2-D simulation may reach 65% and will be about 55% in 3-D simulation, which can meet the requirement of full-gradation concrete simulation. The failure processes of specimen for bending test with different aggregates shapes are numerically simulated. The results indicate that critical load capacity of the specimen with arbitrary polyhedron shape aggregates is greater than that of random spherical aggregates, and the deformation of the former is greater than that of the latter.

• 出版日期2006
• 单位河海大学