Review on finite element analysis of meso-structure model of concrete

With the development of finite element theory and computer technology, the application of numerical simulation methods to disclose the physical mechanisms of deformation and damage within the internal structure of concrete materials is of great significance for the study of static and dynamic mechanical properties at the microscopic level. This paper provides a comprehensive overview of the current research status concerning the numerical simulation of fine-scale mechanics in concrete. The emphasis is on the research advancements in fine-structure modeling of concrete and two-phase materials within the transition zone between aggregates and interfaces, particularly in relation to concrete deformation, damage, and the occurrence of fracture damage. Furthermore, an account is given of the research frontiers in fine-scale numerical simulation of concrete, encompassing domains such as fine-structure modeling of concrete, damage mechanisms, size effect, and so forth. The research findings demonstrate that, through numerical simulation by taking into account the multiphase nature and non-uniformity of concrete materials at the microscopic level, the influence of aggregates and interface transition zones on the macroscopic performance of concrete can be effectively analyzed. The employment of microscopic mechanical models for concrete is conducive to enhancing the accuracy of the microscopic mechanical analysis of concrete. The combination of X-ray computed tomography (X-CT) and finite element numerical simulation yields predictions that exhibit high consistency with experimental measurements, manifesting greater accuracy and a closer approximation to real-world conditions in contrast to traditional models. In conclusion, the article highlights the unresolved issues and prospective directions for further research in the microscopic concrete finite element simulation.