Modeling method of fully-graded concrete three-dimensional mesoscopic model containing random defects

Abstract

The invention relates to a modeling method of a full-graded concrete three-dimensional mesoscopic model containing random defects. The modeling method mainly solves the important problems in the current concrete mesoscopic modeling process that (1) complex aggregate convexity judgment and aggregate intersection and overlapping judgment are difficult to avoid by most modeling methods; (2) a modeling method based on a traditional Voronoi technology is difficult to meet the requirement of aggregate grading; (3) random defects are difficult to introduce into the mesoscopic model; and (4) the modeling efficiency needs to be further improved. The method comprises the following steps: performing a random shrinkage process meeting aggregate grading requirements on each convex polyhedron cell element in a three-dimensional Voronoi graph by taking a corresponding nucleation point as a center, and generating a random aggregate model with four-grade distribution; and the random spherical pore defect with the required volume content is rapidly introduced outside the aggregate distribution area, and finally the full-graded concrete mesoscopic model containing the random defect is established. According to the modeling method, random defects are introduced. Meanwhile, the aggregate grading requirement can be accurately met, and the modeling method has the very obvious efficiency advantage.

Description

technical field [0001] The invention belongs to the research field of concrete mesoscopic modeling, in particular to a method for modeling a three-dimensional mesoscopic model of fully graded concrete with random defects. Background technique [0002] As a complex multiphase heterogeneous composite material, concrete's physical and mechanical properties are closely related to its internal complex mesostructure, such as aggregate shape, gradation, and randomly distributed internal defects. How to make the shape and distribution of the internal mesostructure of concrete more consistent with the real situation has become a hot research topic at present. [0003] At present, the three-dimensional mesoscopic modeling methods of concrete mainly contain two categories: one is the image processing method based on scanning imaging technology, such as the CT image recognition method adopted in the invention patent application (CN 109087396 A, CN 108932393 A); the other is based on com...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems that the aggregate gradation cannot be controlled, the degree is complicated and the stomatal defects of random distribution are not introduced in the existing method of building concrete three-dimensional mesoscopic model based on Voronoi technology, and to provide a concrete with random defects Modeling method of three-dimensional mesoscopic model of fully graded concrete

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