Establishment and numerical simulation method of concrete three-dimensional multiphase mesoscopic model

Abstract

The invention relates to an establishment and numerical simulation method of a concrete three-dimensional multiphase mesoscopic model, which comprises the following steps: firstly, establishing a concrete three-dimensional random aggregate model, expanding an interface transition area layer in a geometric model, and setting an inner and outer grid transition surface to effectively reduce the number of units; on the basis, considering the non-consistency of an interface transition area, and establishing a concrete three-dimensional multiphase mesoscopic model; defining a tensile plastic damage constitutive relation of the concrete test piece material; a displacement loading method is used for carrying out numerical simulation on the three-dimensional failure damage process of the concrete test piece, simulation analysis is carried out on the damage fracture condition in the concrete, and the model established based on the method can more clearly display the damage evolution process of the concrete as a three-dimensional space structure.

Description

technical field [0001] The invention relates to a method for establishing a three-dimensional multiphase mesoscopic model of concrete and a numerical simulation method, belonging to the field of numerical simulation of concrete materials. Background technique [0002] In recent years, my country's urbanization process has continued to advance, and major infrastructure construction and engineering construction are in a stage of rapid development. There is a close connection, and the construction of modern engineering also puts forward higher requirements on the performance of concrete materials. As one of the most widely used building materials, the safety and reliability of concrete directly affect the safety of building structures. [0003] The heterogeneity of concrete itself and its complex internal structure make its failure mechanism very complicated. According to different research emphases, scholars have established various concrete mesoscopic models. The multiphase...

AI Technical Summary

Problems solved by technology

Due to the limitations of computer capabilities in 3D mesoscopic analysis, problems such as too many simplification steps and unreasonable analysis process inevitably exist, resulting in unsatisfactory analysis results of 3D models

In order to facilitate the establishment of models, many 3D models simplify the aggregate shape to a spherical shape, but this is an ideal simplification; some 3D mesoscopic studies only regard concrete as a two-phase material, while ignoring the interface transition zone Most studies did not take into account the inconsistency of the interface transition zone, but treated the interface transition zone outside different aggregates as the same material, which inevitably affected the calculation results

Images