A method which allows for the random structure of aggregates in the numerical simulation of fully graded concrete at a mesoscopic level was developed. Two dimensional geometrical model and the finite element model were automatically generated by coupling the commercial software COMSOL with MATLAB. The generation process was based upon the proposed numerical image processing technology and the different interfacial embedding criterions wherein the aggregate particles were generated from a certain aggregate size distribution and then placed into the concrete specimen in such a way that there was no intersection between the particles. The effectiveness of the proposed method had been assessed by simulating four kinds of coarse aggregate shapes. It is shown that a high efficiency can be achieved in placing aggregates and automatic meshing preprocess for high volume fractions of aggregates in fully graded concrete.
[1]SCHLANGEN E,GARBOCZI E J.Fracture simulations of concrete using lattice models:Computational aspects[J].Engineering Fracture Mechanics,1997,57(2/3):319 332.
[2]MOHAMED A R,HANSEN W.Micromechanical modeling of concrete response under static loading part 1:Model development and validation[J].ACI Materials Journal,1999,96 (2):196 203.
[3]BAZANT Z P,TABBARA M R.Random particle model for fracture of aggregate or fiber composites[J].Journal of Engineering Mechanics,1990,116(8):1686 1705.
LIU Guangting,WANG Zongmin.Numerical simulation study of fracture of concrete materials using random aggregate model[J].Journal of Tsinghua University:Science and Technology,1996,36(1):84 89.(in Chinese)
[5]唐春安,朱万成.混凝土损伤与断裂——数值试验[M].北京:科学出版社,2003:24 43.
TANG Chunan,ZHU Wancheng.Damage and fracture for concrete—Numerical tests[M].Beijing:Science Press,2003:24 43.(in Chinese)
[6]ZUBELEWICZ A,BAZANT Z P.Interface element modeling of fracture in aggregate composites[J].