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本文将混凝土视为含有微裂缝的单相随机介质,给出了混凝土破坏的全过程模拟.首先划分不规则的有限元单元并在相邻有限单元之间设置内聚单元用以将裂缝不连续场引入有限单元.进而考虑混凝土材料细观性质的随机性,采用新近发展的随机谐和函数方法,对混凝土断裂过程中断裂能随机场进行模拟.通过数值算例给出了混凝土单轴受拉试件不同破坏模式的模拟.引入概率密度演化方法,给出了混凝土应力应变曲线的概率密度演化过程.
In this paper, the concrete is regarded as a single-phase random medium containing microcracks, and the whole process simulation of concrete failure is given.Firstly, irregular finite element units are divided and inter-finite unit units are set up to separate the fractures The finite element is introduced into the field.Furthermore, considering the randomness of the microscopic nature of the concrete material, the random field of the fracture energy in the process of fracture of the concrete is simulated by using the newly developed stochastic harmonic function method.A numerical example is given for the uniaxial tension The simulation of different failure modes of specimens is introduced.The probability density evolution of concrete is derived by introducing the method of probability density evolution.