混凝土破裂过程的三维数值模型

利用混合同余法产生了随机变量,将混凝土中的骨料简化为球体,采用循环比较法将随机变量赋给球心坐标(X,Y,Z),实现了混凝土骨料的空间随机分布,最终建立了三维混凝土数值模型。对模型整体进行单元剖分,将骨料、砂浆、界面层分别投影到该有限元网格中,采用多次网格划分技术完成模型网格划分。通过对算例进行有限元计算,结果表明该模型基本上反映了混凝土骨料分布的实际情况,较好地模拟了混凝土的不均匀性与各向异性,验证了建立该模型的方法是可行的。

3D numerical simulation of failure process of concrete

The random variable is generated by mixed congruence method and the aggregate of concrete is simplified as sphere.Then,the spatial location of the sphere(X,Y,Z) is endowed with random variable through the cycled comparing method and the 3D random distribution of concrete aggregate is realized.Moreover,the 3D concrete numerical model is established.Further,the 3D model is meshed.The aggregate,matrix and interface are respectively projected in the FEM mesh.Simultaneously,the model is meshed by means of meshing technique time after time.The result of calculating example proves that this model basically presents the true distribution of aggregates and simulates the inhomogeneity and anisotropism of concrete.Finally,the method of making model is proved feasible.