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建立了混凝土的细观力学模型,考虑骨料、砂浆和界面的3相组成,利用Weibull概率分布对各相材料的力学参数进行随机赋值,体现出材料的细观特征和不均质特性.基于混凝土弹脆性损伤模型,对混凝土开裂进行数值模拟,以单轴压缩和3点弯曲梁实验对该方法进行了验证,同时提出了通过宏观性质演算细观参数的方法,最后,模拟了寒潮工况下早龄期混凝土在不同保温条件下的开裂.结果表明:该方法能较好地模拟混凝土材料中微裂纹的萌发和扩展,能较好地反应混凝土材料在温度荷载下开裂的全过程.
The meso-mechanics model of concrete is established, and the three-phase composition of aggregate, mortar and interface is considered, and the mechanical parameters of each phase are randomly assigned by Weibull probability distribution to reflect the mesoscopic characteristics and heterogeneous characteristics of the materials. The brittleness damage model of concrete is used to simulate the cracking of concrete. The method is verified by uniaxial compression and 3-point bending beam test. At the same time, the method of calculating the meso-parameters by macroscopic properties is proposed. Finally, The results show that this method can simulate the germination and propagation of microcracks in concrete, and can well reflect the whole process of concrete cracking under temperature.