Development of Mesoscale Simulation Approach of Concrete Material and Structural Behavior with Physical Damages with RBSM

Abstract

This paper introduces the development of mesoscale modeling approach with Rigid Body Spring Model (RBSM) for concrete with damages for the multi-scale modeling of concrete and concrete structures with damages. The development works have been conducted by the team, including the authors, at Hokkaido University. The mesoscale modeling is with the generic model applicable for various damage/deterioration. The main concept for the mesoscale modeling is explained first with the literature review to show the necessity of the mesoscale modeling. As the simulation results, macroscale stress-strain relationships and crack propagation in compression and tension under static, sustained, and cyclic loadings, mesoscale damage evolution under freeze thaw cycles (FTCs), and FTCs combined with fatigue loadings and the resulting macroscale stress-strain relationships under compression and tension, and macroscale chloride diffusion of concrete with frost damages are presented. Using the numerical parametric study with the mesoscale simulation, the macroscale stress-strain relationships in compression and tension of concrete with frost damages are presented and applied to the macroscale FEM analysis for concrete beam with frost damage. The analytical results show the applicability of this multi-scale modeling approach. Meanwhile, the remaining tasks for the developed mesoscale modeling approach with RBSM are summarized, which are development of 3D models, extension of generic mesoscale model to other damage/deterioration cases, interface model between concrete and reinforcement, model for materials other than cement concrete, microscale modeling of materials, multi-field analysis, modification of the inaccuracy with modeling by RBSM as well as the experimentation in mesoscale.