FraMCoS 6 2007 Catania, Italy

Plastic modeling with nonlocal damage of concrete subject to mechanical loading

Damage due to growth of microcracks is the essential failure mechanism in concrete. Different damage models (phenomenological and micromechanical approaches) have been developed for damage modelling in concrete under mechanical loading. Due to heterogeneity of microstructure, local tensile stresses can…

First page of: Plastic modeling with nonlocal damage of concrete subject to mechanical loading
Year 2007
File Size 187 KB
Download PDF (187 KB)

Abstract

Damage due to growth of microcracks is the essential failure mechanism in concrete. Different damage models (phenomenological and micromechanical approaches) have been developed for damage modelling in concrete under mechanical loading. Due to heterogeneity of microstructure, local tensile stresses can be generated during loading leading to growth of microcracks and failure. In this paper, we present an elastoplastic model with non- local damage for the description of mechanical behavior and failure process in concrete due to mechanical loading. The non-local formalism is used in order to describe material behaviour after onset of strain localization. After the calibration of the model from typical laboratory data, comparison between experimental data and numerical simulations are presented. The proposed model is implemented in a FEM code. The failure process of a concrete beam subjected to vertical point force applied on the top surface is analysed. Both local and non-local analyses are performed. The results show that the non-local formalism is capable of regularizing the strain localization and failure process.