Numerical Simulation of the Uniaxial Failure of Three-grading Concrete Based on Micro Damage

摘要

With complete computational micro-mechanics method, the whole failure process of uniaxial tension and compression specimen of three-grading concrete of Dongjiang arch dam is carried out. Monte Carlo simulation method is used to generate the random aggregate model, and the number of aggregate of different diameter is determined according to the actual gradation. The maximum tensile stress criterion and the linear Mohr-Coulomb criterion are adopted in the uniaxial tension and uniaxial compression specimen, respectively. The results indicate that concrete macro mechanical performance is much related with the composition of internal structure. The results also show that the interface is the weakest part, in which cracks under tension or yielding under compression is usually observed at first.