%0 Journal Article
%T An investigation of meso-scale crack propagation process in concrete beams using topology optimization
%J Amirkabir Journal of Civil Engineering
%I Amirkabir University of Technology
%Z 2588-297X
%A permanoon, ali
%A Akhaveissy, Amir Hoshang
%D 2022
%\ 02/20/2022
%V 53
%N 12
%P 5281-5306
%! An investigation of meso-scale crack propagation process in concrete beams using topology optimization
%K crack growth
%K meso-scale
%K Topology optimization
%K Finite elements method
%K extended finite element method
%R 10.22060/ceej.2021.18771.6958
%X The current research seeks to investigate a novel method for reducing the computational costs of concrete modeling in the meso-scale. Two separate scales, macro and meso, were used to evaluate concrete behavior. As the stress distribution at the macro scale can be a good indicator to determine the crack critical zones (onset and growth of crack), the numerical model is analyzed at the macro scale using the extended finite element method (XFEM), and then, critical zones are specified in each step using macro-optimization. Afterward, the sum of the zones is modeled in the main model at the meso-scale. At the meso-scale, the three parts of aggregate are modeled with linear behavior, and cement mortar and transfer zone with nonlinear behavior. Aggregates are distributed in cement mortar by a random algorithm and Fuller curve in a circular shape. For meso-scale discretization, the piecemeal discretization method was used, considering the adhesive zone for all elements. Using this method, crack onset and growth are properly modeled. To validate this method, two numerical examples were examined in 2D. The numerical analysis results were in perfect agreement with the laboratory results, and the volume of the calculations was reduced by an average of 35% while maintaining accuracy.
%U https://ceej.aut.ac.ir/article_4289_f24f0a76390ef1a91358bd17deecf882.pdf