混凝土细观层次损伤数值模拟——随机骨料结构的生成

目的在细观层次上对混凝土进行数值模拟,进而对混凝土的力学性能分析.方法应用蒙特卡罗方法,使用C＋＋语言编程开发二维三相混凝土随机骨料结构（RAS）模型.结果提出了避免产生不合常规骨料颗粒的控制措施,引入向量理论分析并去除凹点,弥补了现有方法中确定骨料多边形延伸率的缺陷;并在Visual C＋＋上模拟实现、生成了具有概率和统计意义的RAS.最后,通过一个数值算例验证了所提方法的有效性.结论笔者提出的RAS产生方法为进一步开发混凝土细观有限元模型打下了坚实的基础.

Numerical Simulation of Micro Mechanics of Concrete- Production of Random Aggregate Structure

In order to analyze the behavior of concrete in microscopic level,a 2-D concrete random aggregate structure(RAS) model is developed by Monte-Carlo method in C language in this paper.Some control measures are proposed to avoid creating unexpected aggregates;furthermore,vector theory is introduced to cut off concave points and offsets the drawbacks of determining extension ratio in current methods.Numerical simulation comes true on the basis of Visual C ,thus producing the random aggregate structure(RAS) with a sense of probability and statistical.Finally,a numerical example proves the validity of the method.The proposed method of production RAS provides a solid foundation for further development of the finite element model of concrete microscopic analysis.