Abstract

Info

Title:: Meso Stochastic Fracture Model for Concrete Based on Implicit Gradient Theory

Author(s):: LI Ping; REN Xiao-dan; LI Jie; School of Civil Engineering, Tongji University

Keywords:: concrete; implicit gradient; nonlocalization; meso stochastic fracture model

Abstract:: Based on the basic concept of multiscale mechanics, authors combined the gradient nonlocal theory with seriesparallel spring model and developed a meso stochastic fracuture model for concrete. By introducing the fracture strain as a lognormal stochastic variable, uncontrollability of microfracture for concrete material was validated. Avoidance of layer sensitivity in traditional seriesparallel spring model was achieved with nonlocalization theory. Moreover, the authors analyzed the models from several aspects, such as the characteristic parameter, evolution of local strain and damage, as well as layer sensitivity. Finally, the analysis based on the model were compared with experimental data, to verify the correctness of the model. The study results show that the model has a high efficiency, and can be realized in computer software.