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针对混凝土裂纹破坏模式,从混凝土基本损伤机理出发,基于连续损伤理论,采用受拉损伤因子和受剪损伤因子来分别反映混凝土拉压状态下微观损伤对材料宏观力学特征的影响,提出了一种新的混凝土塑性损伤模型.将描述混凝土塑性部分的屈服准则和流动法则建立在有效应力空间上,以便于分离塑性和损伤过程以及材料参数拟合.同时塑性演化可用向后欧拉隐式算法求解而损伤演化可显式求解,使模型存在稳健积分算法,便于有限元数值计算.通过与大量的试验结果对比分析表明,该模型可以有效模拟混凝土在多轴应力状态下非线性力学特征,可以在实际工程中应用.
According to the damage mechanism of concrete, based on the theory of continuous damage, the tensile damage factor and shear damage factor are used to reflect the influence of microscopic damage on the macroscopic mechanical properties of concrete under tension and compression conditions respectively. A new model of plastic damage in concrete will be described in which the yield criterion and flow law of the plastic part of the concrete are established on the effective stress space in order to facilitate the separation of plasticity and damage processes and the fitting of material parameters.The plastic evolution can be solved by the backward Eulerian implicit algorithm The damage evolution can be solved explicitly, and the model has a robust integral algorithm to facilitate the numerical calculation of finite element.Comparison with a large number of test results shows that the model can effectively simulate the nonlinear mechanical characteristics of concrete under multiaxial stress conditions, Practical application of the project.