Although isotropic damage models are considered for a first approximation to simulate the deformation behavior of concrete, micro-cracking of concrete occurring due to the sequential and multi-directional loads necessitates an anisotropic description of damage for a reliable representation of damage in concrete. The present paper discusses modeling aspects of mechanical degradation behavior of concrete based on continuum damage theory. The model characterizes the distinct behavior of concrete in tension and compression using using multi-loading surfaces. The principal strains govern the growth of damages in principal directions. The damage effect tensors are based on the principal tensile or compressive damages. Crackopening/closure effects and permanent strains are described through inelastic crack strains under tension and compression. The effect of tensile/compressive damage evolution on the Poisson's ratio is incorporated to capture large strains in the lateral directions during tension-compression loadings. The numerical results of several test cases exhibit good agreement with experimental results.
A non-linear bond model is presented, capturing bond behaviour between concrete and reinforcing ribbed steel bars. An existing model, where coupled thermal-hygric-mechanical-chemical (THMC-) processes are already modelled for pure concrete, will be extended by the presented bond model. Against this background and due to the resulting requirements the approach of a geometrically consistent consideration of the reinforcement is chosen, neglecting the bar ribs in the geometric model. All bond mechanisms are considered by the additional bond model in between concrete and reinforcement. With this procedure the principle of a formal treatment and general description, used in the existing model describing the different processes, is not only continued, but also transferred regarding the three components concrete, steel and bond. The bond model is discretized by interface elements, which describe curved surfaces in 3D space. The presented non-linear bond model incorporates the mechanical interaction of the bar rips with adjacent concrete as well as the damage of the bond zone.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.