混凝土三维参数化骨料模型的创建方法

在混凝土细观结构试件的模拟中，为了降低骨料之间的相互排斥性，缩小骨料之间的空隙、提高骨料的含量、加快试件的创建速度，提出混凝土三维参数化骨料模型的创建方法。该方法充分利用骨料的参数方程，给出了骨料内外的判别方法，以及点到骨料的距离的快速计算方法和误差估计，可以有效地控制骨料之间的空隙，从而提高试件中骨料的含量。实验表明这是一个有效的方法，可以按二级配生成含不规则骨料体积达55%以上的试件，完全达到了实际混凝土的骨料含量要求，为对混凝土进行细观力学分析提供了创建数值模型的方法。

The approach to establishing a three-dimensional parameterized aggregate model for concrete simulation

In the numerical simulation of specimen of concretes in meso-level, to reduce the repellency and distances between aggregates as well as to improve the content of the aggregates and the computational speed of generating the specimen, the method of establishing a three-dimensional parametric aggregates model is developed. This method makes use of the parametric equation of the aggregates, presents a rule to determine whether a spatial point is inside the aggregates. Moreover, the fast algorithm for computing the distance between the spatial points and the generated aggregates is presented and the corresponding error analysis is given. Based on these facts, the space between aggregates can be controlled and therefore, the content of aggregates in the specimen can be improved. Numerical results show that this is an effective method, with which the concrete specimen with more than 55% irregular aggregates in volume can be generated according to two gradation. This is very close to content of aggregates in practical concrete. Therefore, an aggregate model of concretes in meso-level for further mechanical analysis is developed.