混凝土二维参数化骨料模型的创建方法

THE APPROACH TO ESTABLISHING A TWO-DIMENSIONAL PARAMETERIZED AGGREGATE MODEL FOR CONCRERE SIMULATION

基于参数化骨料的特点,在混凝土二维参数化骨料模型的创建中,提出了让覆盖椭圆可以相互有重叠,骨料却相互分离的创建方法。该方法降低了骨料之间的相互排斥性,可以在创建的试件中缩小骨料之间的空隙,从而增加试件中骨料的含量,提高模型创建的速度。同时,在模型的创建中采用了按级配分级随机投放的方式,保证了骨料分布的合理性。实验表明:使用该方法能够比较快的按三级配生成含骨料75%以上的几何模型试件,可以满足大体积、全级配、高强度混凝土的骨料投放模拟要求。最后给出了力学分析实例,以说明该算法的有效性。

To establish a two-dimensional parameterized aggregate model for concrete simulation, we propose one method, which is based on the characteristics of the parameterized aggregate, such that the coverage ellipses can be overlapped while the corresponding aggregates are separated from each other. This method reduces the mutual repulsion between different aggregates. Therefore, the specimen generated with the proposed method have narrower gap between different aggregates and contain more content of aggregates. Furthermore, the computation speed for generating the model is also improved. Meanwhile, the aggregates are put in randomly in each grading with different gradations, which guarantees the rationality of the aggregates distribution in the specimen. Numerical experiments show that, with this method, the geometrical model of specimen with the property that the aggregates content is up to 75% according to three gradations can be generated in a relatively short time. Thusly, this method can be used to simulate aggregates putting-in model to generate concretes which are in a great mass, fully-graded and high-strength. Finally, the mechanical analysis of examples is given to illustrate the effectiveness of the proposed method.