A finite element approach for predicting the ultimate rotation capacity of RC beams
Author
Date
2013-07-15Type
Access rights

Metadata
Show full item recordAbstract
This paper presents a numerical approach to model the complex failure mechanisms that define the ultimate rotational capacity of reinforced concrete beams. The behavior in tension and compression is described by a constitutive damage model derived from a combination of two specific damage models [1]. The nonlinear behavior of the compressed region is treated by the compressive damage model based on the Drucker-Prager criterion written in terms of the effective stresses. The tensile damage model employs a failure criterion based on the strain energy associated with the positive part the effective stress tensor. This model is used to describe the behavior of very thin bands of strain localization, which are embedded in finite elements to represent multiple cracks that occur in the tensioned region [2]. The softening law establishes dissipation energy compatible with the fracture energy of the concrete. The reinforcing steel bars are modeled by truss elements with elastic-perfect plastic behavior. It is shown that the resulting approach is able to predict the different stages of the collapse mechanism of beams with distinct sizes and reinforcement ratios. The tensile damage model and the finite element embedded crack approach are able to describe the stiffness reduction due to concrete cracking in the tensile zone. The truss elements are able to reproduce the effects of steel yielding and, finally, the compressive damage model is able to describe the non-linear behavior of the compressive zone until the complete collapse of the beam due to crushing of concrete. The proposed approach is able to predict well the plastic rotation capacity of tested beams [3], including size-scale effects.
How to cite this document
Keywords
Language
Collections

Related items
Showing items related by title, author, creator and subject.
-
Comparative analysis of strut-and-tie models using Smooth Evolutionary Structural Optimization
Almeida, Valério S.; Simonetti, Hélio Luiz; Oliveira Neto, Luttgardes de(Engineering Structures, 2013) [Artigo]
The strut-and-tie models are widely used in certain types of structural elements in reinforced concrete and in regions with complexity of the stress state, called regions D, where the distribution of deformations in the ... -
Identification of steel bars immersed in reinforced concrete based on experimental results of eddy current testing and artificial neural network analysis
De Alcantara, Naasson(Nondestructive Testing and Evaluation, 2013) [Artigo]
This paper presents an experimental research on the use of eddy current testing (ECT) and artificial neural networks (ANNs) in order to identify the gauge and position of steel bars immersed in concrete structures. The ... -
Steel bars identification in reinforced concrete structures by using ANN and magnetic fields
De Alcantara, N. P.; Gasparini, M. E L
(PIERS 2005 - Progress in Electromagnetics Research Symposium, Proceedings, 2005) [Trabalho apresentado em evento]
This work proposes a methodology for non destructive testing (NDT) of reinforced concrete structures, using superficial magnetic fields and artificial neural networks, in order to identify the size and position of steel ...