方 秦, 张锦华, 还 毅, 张亚栋. 全级配混凝土三维细观模型的建模方法研究[J]. 工程力学, 2013, 30(1): 14-21,30. DOI: 10.6052/j.issn.1000-4750.2011.06.0398
引用本文: 方 秦, 张锦华, 还 毅, 张亚栋. 全级配混凝土三维细观模型的建模方法研究[J]. 工程力学, 2013, 30(1): 14-21,30. DOI: 10.6052/j.issn.1000-4750.2011.06.0398
FANG Qin, ZHANG Jin-hua, HUAN Yi, ZHANG Ya-dong. THE INVESTIGATION INTO THREE-DIMENSIONAL MESOSCALE MODELLING OF FULLY-GRADED CONCRETE[J]. Engineering Mechanics, 2013, 30(1): 14-21,30. DOI: 10.6052/j.issn.1000-4750.2011.06.0398
Citation: FANG Qin, ZHANG Jin-hua, HUAN Yi, ZHANG Ya-dong. THE INVESTIGATION INTO THREE-DIMENSIONAL MESOSCALE MODELLING OF FULLY-GRADED CONCRETE[J]. Engineering Mechanics, 2013, 30(1): 14-21,30. DOI: 10.6052/j.issn.1000-4750.2011.06.0398

全级配混凝土三维细观模型的建模方法研究

THE INVESTIGATION INTO THREE-DIMENSIONAL MESOSCALE MODELLING OF FULLY-GRADED CONCRETE

  • 摘要: 根据混凝土材料细观结构特点,采用混合同余算法生成随机数,模拟混凝土骨料在形状和空间分布方面具有的随机性特点。按照混凝土级配理论,分析了不同级配混凝土细观组成特点,研究了不同粒径骨料的含量和分布规律,提出了一种高效的三维骨料生长和凸性判定算法,研究了骨料生长过程中的形状控制技术,避免了尖角、薄片状骨料的出现;在骨料投放过程中采用综合投放算法,大幅度提高了骨料一次性投放成功率和骨料体积含量,缩短了计算时间。在三维细观有限元网格剖分方面,采用向量判别法,优化了材料属性判定,提高了计算效率。算例表明,该文提出的细观模型,在模拟混凝土静力特性和冲击破坏特性方面具有较高的可靠性。

     

    Abstract: Based on the meso-structure of concrete, the mixed congruential algorithm to generate a random number was applied to simulate the randomness of aggregate in shape and spatial distributions. According to the law of composition and distribution of different gradation aggregates with different sizes, a highly efficient algorithm of three-dimensional aggregate growth and convex judgment were proposed. In order to avoid the emergence of a sharp corner and thin sheet aggregate, a new method of aggregate shape control was developed. The proposed integrated packing algorithm has highly efficiency in increasing the good rate of first packing and the volume content of aggregate, and reduces the computational time greatly. In the process of three-dimensional finite element mesh, the proposed vector method could improve the computational efficiency of the discrimination of material attributes. The examples show that the proposed mesoscale model has a high reliability in simulating the static and impact responses of concrete.

     

/

返回文章
返回