A repairability index for reinforced concrete members based on fracture mechanics

Alarcón, Enrique; Recuero, A.; Perera, Ricardo; López, Cecilio; Gutiérrez, Jesús Villa; Diego, Ana de; Picón, Ricardo; Flórez-López, Julio

doi:10.1016/s0141-0296(00)00075-4

Cited by 17 publications

(11 citation statements)

References 12 publications

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“…As soon as the reinforcement initiates its yielding process the damage growth turns less accel-erated. At the instant that the structure reaches the maximum value of load resistance measured experimentally (see [22]), the damage on hinge '2' presents itself with intensity about 0.6, which is considered excessive to reinforced concrete structures, [23]. From this point on, the structure continues to deform in a process of controlled displacement.…”

Section: Prestressed and Precast Concrete Segmental Liningmentioning

confidence: 99%

“…Notice that the constitutive model, represented by the set of equa-tions (23,26,28) is also nonlinear. Therefore, it is necessary the use of Newton's method combined with a predictor and corrector strategy in local character.…”

Section: Numerical Implementationmentioning

confidence: 99%

“…the elastic flexibility matrix of element. The equations(16, 17 and 22) allow writing the elasticity law of an element as:(23) …”

mentioning

confidence: 99%

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Modelagem simplificada do processo de fissuração e colapso em pórticos e arcos de concreto armado

Amorim

Proença

Flórez-López

2014

Rev. IBRACON Estrut. Mater.

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A simulação consistente de processos de falha progressiva e colapso estrutural ainda é um problema aberto de grande interesse para a engenharia. Dentre as teorias que são capazes de modelar de alguma forma tal classe de problemas, a mecânica do dano contínuo é a maisrecente. Entretanto, um dos gargalos que ainda persistem é quando nas simulações numéricas a estrutura passa a apresentar o fenômenode localização de deformações, com consequente dependência dos resultados sobre a malha empregada. Para sanar este problema diversosmétodos ditos de regularização foram desenvolvidos. Todavia, apesar de eficazes, estes métodos podem inserir um grau de complexidadesignificativo nas abordagens numéricas. Neste trabalho propõe-se uma metodologia simplificada para análise estrutural não linear de pórticose arcos por meio da localização prévia dos fenômenos inelásticos em rótulas, posicionadas nas extremidades dos elementos finitos de barra earco. Desta forma é possível contornar a dependência de malha e reproduzir de forma satisfatória problemas reais, como mostram os exemplos de estruturas de concreto armado reunidos no fim deste artigo.

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Section: Prestressed and Precast Concrete Segmental Liningmentioning

confidence: 99%

Section: Numerical Implementationmentioning

confidence: 99%

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Modelagem simplificada do processo de fissuração e colapso em pórticos e arcos de concreto armado

Amorim

Proença

Flórez-López

2014

Rev. IBRACON Estrut. Mater.

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“…For instance, values of damage less than 0.2 can be described as minor, repairable damages are in the range [0.2, 0.45] and values over 0.6 corresponds to progressive collapse. Theoretical and experimental justification for these values can be found in [14].…”

Section: Numerical Examplesmentioning

confidence: 99%

Portal of damage: a web-based finite element program for the analysis of framed structures subjected to overloads

Marante

Suárez

Quero

et al. 2005

Advances in Engineering Software

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This paper describes a web-based finite element program called portal of damage. The purpose of the program is the numerical simulation of reinforced concrete framed structures, typically buildings, under earthquakes or others exceptional overloads. The program has so far only one finite element based on lumped damage mechanics. This is a theory that combines fracture mechanics, damage mechanics and the concept of plastic hinge. In the case of reinforced concrete frames, the main mechanism of deterioration is cracking of concrete. Cracking in a frame element is lumped at the plastic hinges. Cracking evolution in the plastic hinge is assumed to follow a generalized form of the Griffith criterion. The behavior of a plastic hinge with damage is described via the effective stress hypothesis, as used in continuum damage mechanics. The portal that can be accessed using any commercial browser (explorer, netscape, etc.) allows to:

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“…The other analysis based on theory of fracture mechanics (Enrique, 2001 ) suggested that the damage state could be represented by the strain energy by calculating the lost energy and the crack resistance of the plastic hinge. A damage function was also suggested by accumulating the plastic deformation (Stephens & Yao, 1987 ), where the plastic deformation is similar to the maximum deflection as in previous damage index.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Index for Flexural Damage Reinforced Concrete Members

Lee¹,

Chang²,

Yu³

2002

Structural Stability and Dynamics

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To examine the damages of structure in use is generally a challenging task., particularly when a fast inspection is required by using limited tools or even the bare eyes. The other challenge is how to evaluate the damage state after the fast safety examination. Most well know damage indexes for the structure are for the design purposes such as to estimate the possible damage state when structure is under extraordinary loading condition. The index must relate to the maximum force applied and maximum deflection or plastic deformation. To have structure's real response is generally impossible unless on-line monitoring is applied. Therefore, it is the interest of this study to find a means to evaluate the damage state through the limited data obtained by bare-eye examination or using limited tools. The evaluation was performed in the laboratory by testing the scaled down beam models and compared the data obtained by limited tools to the one obtained through data acquisition system. It was found that for the large scale, fast structure inspection this new developed simplified damage index may provide a convenient means for the damage evaluation of the structures.

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A repairability index for reinforced concrete members based on fracture mechanics

Cited by 17 publications

References 12 publications

Modelagem simplificada do processo de fissuração e colapso em pórticos e arcos de concreto armado

Modelagem simplificada do processo de fissuração e colapso em pórticos e arcos de concreto armado

Portal of damage: a web-based finite element program for the analysis of framed structures subjected to overloads

A Simplified Index for Flexural Damage Reinforced Concrete Members

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