一种快速生成三维混凝土骨料模型的混合实现方法

摘要

The three-dimensional random aggregate concrete model is usually considered as a three-phase composite materials which are composed of aggregates,cement matrix and the interface layers.A hybrid realization method is proposed in order to rapidly obtain the concrete aggregate models with high volume fraction of spherical particles by combining Fortran and ANSYS software.The corresponding ellipsoid aggregate (pebble) model,the convex polyhedral aggregate (gravel) model and the mixed model with different shape aggregates are also generated.The results of several examples show that the relevant data of three-graded concrete model with spherical aggregate particles can be obtained rapidly and the corresponding aggregate content can reach about 65％.The hybrid realization method can easily separate the aggregate particles from the interface layers and thus the complex element attribute discrimination can be avoided in the finite element mesh.Finally,the validity of the proposed hybrid method is further verified by finite element numerical simulation for the ellipsoidal aggregate model and the convex polyhedral aggregate model.%三维随机骨料混凝土模型是由骨料、砂浆基体以及界面层组成的三相复合材料,基于Fortran和ANSYS软件提出了一种快速生成含高体分比球形骨料混凝土模型的混合实现方法,并在此基础上生成三维椭球形骨料(卵石)模型、凸多面体骨料(碎石)模型以及混合模型.算例结果表明,这种新方法可以快速生成三级配球形颗粒混凝土模型所需的骨料数据,相应的骨料投放含量能达到65％左右.混合方法可将骨料颗粒和界面层分离开来,在有限元网格剖分时避免了复杂的单元属性判别.通过对椭球形骨料模型和凸多面体骨料模型的有限元数值模拟,进一步验证了该混合方法的有效性.