考虑方向效应的钢纤维混凝土损伤破坏数值分析

Numerical analysis of damage and failure of steel fiber reinforced concrete considering orientation coefficient

钢纤维的平均方向效应系数是表征纤维综合取向性对混凝土性能影响的一个重要因素。为了从细观层次探究平均方向效应系数对钢纤维增强混凝土复合材料损伤开裂的影响,本研究基于有限元软件参数化语言,建立了由钢纤维、水泥砂浆以及界面过渡区三相材料构成的二维钢纤维混凝土模型,并模拟了不同平均方向效应系数下钢纤维混凝土单轴拉伸破坏的全过程。结果表明:混凝土的抗拉强度随着平均方向效应系数的增大而提高;钢纤维对混凝土的阻裂增韧效应也随之增强,进一步揭示了钢纤维混凝土在单轴拉伸条件下混凝土的损伤破坏机理。

The average orientation coefficient of steel fiber is an important factor to characterize the influence of fiber comprehensive orientation on concrete performance.In order to explore the influence of average orientation coefficient of steel fiber on the damage and cracking of steel fiber reinforced concrete composites in microscopic level,in this paper,a two-dimensional finite element model of steel fiber reinforced concrete composed of steel fiber,cement mortar and interface transition zone of three-phase materials was established based on the parametric language,and the whole process of uniaxial tensile failure of steel fiber reinforced concrete under different average orientation coefficient was simulated.Results show that the tensile strength of concrete increase with the average orientation coefficient;the crack resistance and toughening effect of steel fiber on concrete is also enhanced,which further reveals the damage mechanism of steel fiber reinforced concrete under uniaxial tension.