Abstract: A spatial random convex polyhedron coarse aggregate model was established based on the traditional aggregate generation method, meanwhile, a solid interface transition zone with adjustable thickness was established. The mechanical behavior of three-dimensional mesoscopic concrete under quasi-static uniaxial compression and uniaxial tension was analyzed by finite element method. The simulation results of stress-strain relationship and damage failure mode were compared with the experimental results, which verifies the reliability of the three-dimensional mesoscopic finite element model. Then the influence of aggregate distribution, aggregate geometric change and interface transition zone thickness on the failure mode and stress-strain relationship of concrete were analyzed. The results showed that aggregate distribution has little effect on uniaxial compression damage, but had great influence on uniaxial tensile damage and stress-strain curve under uniaxial tension and compression load. With the increase of aggregate roughness, the damage area increased and the peak stress increased gradually under uniaxial compression. The damage and peak stress were less affected by uniaxial tension, and there was no obvious change rule. With the increase of the thickness of the interfacial transition zone, the peak stress of uniaxial tension and uniaxial compression decreased gradually.
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2025, Vol. 39 
