Damage modelling of reinforced concrete beams

Júnior, Faustino Sanches; Venturini, W. S.

doi:10.1016/j.advengsoft.2006.08.025

Cited by 23 publications

(9 citation statements)

References 17 publications

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“…Para o surgimento da fissura seguem-se dois critérios: o primeiro é a tensão principal exceder a tensão limite estabelecida; e o segundo é o ângulo limite ser vencido. Deve-se notar que após o surgimento da primeira fissura, Rots (1988) …”

Section: Modelo Multidirecionalunclassified

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Influência do modelo de fissuração na modelagem em elementos finitos de vigas de concreto armado

Pacheco¹,

Lima²,

Lima

2017

Cieng

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RESUMOO concreto é um material muito versátil e de larga utilização na construção civil. A avaliação do seu comportamento não linear físico, porém, ainda é um dos grandes desafios da engenharia estrutural. Neste trabalho foram investigados três métodos de fissuração distribuída do concreto utilizados para modelagem numérica de vigas de concreto armado: fixo, rotacional e multidirecional. Para validação dos métodos foram modeladas numericamente vigas ensaiadas por Bresler e Scordelis (1963) e Álvares (1993) utilizando o programa computacional DIANA. Foi verificado, que para vigas com falhas por flexão, todos os três modelos apresentaram bons resultados com capacidade para prever o caminho de equilíbrio. Para vigas que rompem por cisalhamento, no entanto, não foi possível encontrar soluções aceitáveis com o modelo fixo de fissuração, enquanto que, com o modelo rotacional de fissuração foi obtida grande instabilidade numérica para determinar o caminho de equilíbrio logo após o surgimento da fissura diagonal. Palavras-Chave: viga de concreto armado; modelos de fissuração; método dos elementos finitos. ABSTRACTThe concrete is an outstanding material with vast utilization in the civil construction area. The determination of nonlinear behavior of concrete is still a major challenge in structural engineering. In this study there were investigated three smeared cracking models used for numerical modeling of reinforced concrete beam: fixed, rotational and multidirectional. In order to validate the models, three experimental samples studied by Bresler & Scordelis (1963) and Álvares (1993) were selected and modeled using the software DIANA. The results indicated that the three adopted smeared crack models performed well and where capable of predicting the equilibrium path. However, to beams with shear rupture it was impossible to find acceptable solutions for the fixed model, whereas with the rotational model it was obtained major numerical instability in order to determine the equilibrium path after materializing the diagonal cracking.

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Section: Modelo Multidirecionalunclassified

“…Devido a isso, os métodos numéricos de análise de estruturas de concreto armado incorporam em sua formulação diversos modelos para consideração da fissuração do concreto (ZHANG et al, 2007;SANCHES;VENTURINI, 2007;RADI NETO, 2007).…”

Section: -Introduçãounclassified

Influência do modelo de fissuração na modelagem em elementos finitos de vigas de concreto armado

Pacheco¹,

Lima²,

Lima

2017

Cieng

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“…Although this technology is gaining interest in Italy, well-codified structural design formulas and rules are not available yet. This entails that the mechanical behavior of truss-reinforced steel-concrete composite beams can be analyzed by comparison with structural models of classical reinforced concrete beams and steel and concrete composite beams (Mark [5], Sanches Júnior and Venturini [6]). Therefore, a systematic experimental and theoretical investigation about this class of steel-concrete structural elements has recently started with the aim of defining a comprehensive set of design tools for practitioners.…”

Section: Introductionmentioning

confidence: 99%

Bending Stiffness of Truss-Reinforced Steel-Concrete Composite Beams

Trentadue¹,

Mastromarino²,

Quaranta³

et al. 2014

OJCE

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This paper is concerned with a special steel-concrete composite beam in which the resisting system is a truss structure whose bottom chord is made of a steel plate supporting the precast floor system. This system works in two distinct phases with two different resisting mechanisms: during the construction phase, the truss structure bears the precast floor system and the resisting system is that of a simply supported steel truss; once the concrete has hardened, the truss structure becomes the reinforcing element of a steel-concrete composite beam, where it is also in a pre-stressed condition due to the loads carried before the hardening of concrete. Within this framework, the effects of the diagonal bars on the bending stiffness of this composite beam are investigated. First, a closed-form solution for the evaluation of the equivalent bending stiffness is derived. Subsequently, the influence of geometrical and mechanical characteristics of shear reinforcement is studied. Finally, results obtained from parametric and numerical analyses are discussed.

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“…The Ritter-Mörsch's truss analogy was used to calculate the stirrups transferred force portion. Sanches Jr and Venturini [30] considered the stress state of the middle point to define the stirrups strain. However, in nonlinear behavior the stirrup stresses increase from the compressed flange toward the tensioned flange, but decrease in the regions close to the longitudinal tensile reinforcement.…”

Section: Shear Reinforcement Contributionmentioning

confidence: 99%

“…n ht ∑ n ht (30) in which α is the main tensile direction defined over the horizontal plane and n ht is the number of integration points along the cross-section of a finite element.…”

Section: Dowel Action Contributionmentioning

confidence: 99%

Material and geometric nonlinear analysis of reinforced concrete frame structures considering the influence of shear strength complementary mechanisms

Nogueira

Venturini

Coda

2013

Lat. Am. j. solids struct.

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A mechanical model for the analysis of reinforced concrete frame structures based on the Finite Element Method (FEM) is proposed in this paper. The nonlinear behavior of the steel and concrete is modeled by plasticity and damage models, respectively. In addition, geometric nonlinearity is considered by an updated lagrangian description, which allows writing the structure equilibrium in the last balanced configuration. To improve the modeling of the shear influence, concrete strength complementary mechanisms, such as aggregate interlock and dowel action are taken into account. A simplified model to compute the shear reinforcement contribution is also proposed. The main advantage of such a model is that it incorporates all these effects in a one-dimensional finite element formulation. Two tests were performed to compare the provided numerical solutions with experimental results and other one-and bi-dimensional numerical approaches. The tests have shown a good agreement between the proposed model and experimental results, especially when the shear complementary mechanisms are considered. All the numerical applications were performed considering monotonic loading.

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Damage modelling of reinforced concrete beams

Cited by 23 publications

References 17 publications

Influência do modelo de fissuração na modelagem em elementos finitos de vigas de concreto armado

Influência do modelo de fissuração na modelagem em elementos finitos de vigas de concreto armado

Bending Stiffness of Truss-Reinforced Steel-Concrete Composite Beams

Material and geometric nonlinear analysis of reinforced concrete frame structures considering the influence of shear strength complementary mechanisms

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