Fibre‐reinforced concrete in <i>fib</i> Model Code 2010: principles, models and test validation

Prisco, Marco di; Colombo, M.; Dozio, Daniele

doi:10.1002/suco.201300021

Cited by 176 publications

(155 citation statements)

References 32 publications

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“…Taking α = 0.2 and d n = 0.2h sp results in k 1 = 1.25 and k 1 k 2 ≈ 1. This is similar to the value determined in [8,11] for the case where α = 0.2 and d n = 0.2h sp and where the notch effect is ignored (i.e. k 2 = 1.0).…”

supporting

confidence: 87%

“…To further validate the model, data was collated from the studies of Colombo [34] (used in di Prisco et al [11] for comparison with fib Model Code 2010 [10] model) and Deluce [35]. In these studies, both indirect and direct tension tests were performed on SFRC produced from the same mix.…”

Section: Simplified Model For Designmentioning

confidence: 99%

“…For this reason, extensive efforts have been made to find a reliable model for obtaining the post-cracking behaviour based on an inverse analysis of data obtained from either notched or unnotched prism bending tests [5][6][7][8]. However, although this methodology has been incorporated in the fib Model Code for Concrete Structures 2010 [8][9][10], the test data available at the time for full validation was somewhat limited [11]. In this paper a physically based model is developed to predict the tensile response of strain-softening SFRC from prism bending tests.…”

Section: Introductionmentioning

confidence: 99%

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Derivation of the σ‐w relationship for SFRC from prism bending tests

Amin

Foster

Muttoni

2015

Structural Concrete

111

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supporting

confidence: 87%

Section: Simplified Model For Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Derivation of the σ‐w relationship for SFRC from prism bending tests

Amin

Foster

Muttoni

2015

Structural Concrete

111

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“…In this case, the tensile law should be defined in terms of σ − w , based on the fracture mechanics approach (discrete crack formulation). If the UHPFRC exhibits a strain hardening response before localization, the average space between cracks can be considered to be the link between strain and crack opening before localization (see also [55]). A simplified inverse analysis method is also proposed in [35], based on four-point bending tests.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Ultra High-Performance Fiber-Reinforced Concrete (UHPFRC): a review of material properties and design procedures

Buttignol

Sousa

Bittencourt

2017

Rev. IBRACON Estrut. Mater.

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ResumoThis paper does a review of the recent achievements on the knowledge of UHPFRC properties and in the development of design procedures. UHPFRC is defined as a new material, with unique properties (high ductility, low permeability, very high strength capacity in compression, higher toughness) in comparison to conventional concrete. It is important to know both material and mechanical properties to fully take advantage of its outstanding properties for structural applications. However, since this is a new material, the current design codes are not well suited and should be reviewed before being applied to UHPFRC. In the first part, the following material properties are addressed: hydration process; permeability; fibers role; mix design; fiber-matrix bond properties workability; mixing procedure; and curing. In the second part, the mechanical properties of the material are discussed, together with some design recommendations. The aspects herein examined are: size effect; compressive and flexural strength; tensile stress-strain relation; shear and punching shear capacity; creep and shrinkage; fracture energy; steel bars anchorage and adherence. Besides, the tensile mechanical characterization is described using inverse analysis based on bending tests data. In the last part, material behavior at high temperature is discussed, including physical-chemical transformations of the concrete, spalling effect, and transient creep. In the latter case, a new Load Induced Thermal Strain (LITS) semi-empirical model is described and compared with UHPC experimental results.Keywords: Ultra-High Performance Fiber Reinforced Concrete (UHPFRC), material properties, design procedures, mechanical behavior, high temperature.Este artigo faz uma análise dos recentes avanços nas pesquisas das propriedades do CUADRF e dos seus procedimentos normativos. O CUA-DRF pode ser definido como um novo material, com propriedades muito superiores (grande ductilidade, baixíssima permeabilidade, altíssima capacidade resistente à compressão e elevada tenacidade) às do concreto convencional. O conhecimento das propriedades mecânicas e do material do CUADRF é importante para que todo o seu potencial seja plenamente utilizado. Entretanto, como este é um novo material, as recomendações normativas atuais não são plenamente válidas. Na primeira parte, as seguintes propriedades do material são descritas: processo de hidratação; permeabilidade; efeito dos diferentes tipos de fibras; definição do traço; aderência entre as fibras e o concreto; trabalhabilidade; procedimentos de mistura; e cura. Na segunda parte, as propriedades mecânicas e algumas recomendações normativas são discutidas. Neste caso são examinados o efeito escala, a resistência à compressão e à flexão, a relação tensão-deformação à tração, a força de cisalhamento e de punção, a fluência e a retração, a energia de fratura, a ancoragem e aderência das barras de aço. Além disso, são descritos alguns métodos de análise inversa para a caracterização do material à tração por meio de ensaios ...

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“…For SFRC, the difference between the two tests (three or four-point bending test) is not so large when a careful non-linear computation is carried out (18). RILEM proposes a three-point bending test, but in this study a fourpoint load arrangement was adopted as it creates a region of constant moment at the middle of the prism and minimises the load-spreading effect at the point of load application (19).…”

Section: Bending Testsmentioning

confidence: 99%

Post-cracking tensile behaviour of steel-fibre-reinforced roller-compacted-concrete for FE modelling and design purposes

et al. 2017

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ABSTRACT:Fracture of steel-fibre-reinforced-concrete occurs mostly in the form of a smeared crack band undergoing progressive microcracking. For FE modelling and design purposes, this crack band could be characterised by a stress-strain (σ-ε) relationship. For industrially-produced steel fibres, existing methodologies such as RILEM TC 162-TDF (2003) propose empirical equations to predict a trilinear σ-ε relationship directly from bending test results. This paper evaluates the accuracy of these methodologies and their applicability for rollercompacted-concrete and concrete incorporating steel fibres recycled from post-consumer tyres. It is shown that the energy absorption capacity is generally overestimated by these methodologies, sometimes up to 60%, for both conventional and roller-compacted concrete. Tensile behaviour of fibre-reinforced-concrete is estimated in this paper by inverse analysis of bending test results, examining a variety of concrete mixes and steel fibres. A multilinear relationship is proposed which largely eliminates the overestimation problem and can lead to safer designs. RESUMEN:Comportamiento a tracción posterior a la fisuración del hormigón reforzado con fibras de acero compactado con rodillo para el diseño y modelado EF. La rotura del hormigón reforzado con fibra de acero se produce principalmente en forma de una banda de fisuración que sufre progresiva microfracturación. Para el diseño y modelado EF, esta banda se puede caracterizar por una relación tensión-deformación (σ-ε). Para fibras de acero industriales, existen metodologías (RILEM TC 162-TDF 2003) que proponen ecuaciones empíricas para predecir una relación σ-ε trilinear a partir de resultados de pruebas de flexión. En este artículo se evalúa la precisión de estas metodologías y su aplicación para hormigón compactado con rodillo y hormigón reforzado con fibras de acero recicladas provenientes de neumáticos usados. Se demuestra que estas metodologías generalmente sobreestiman la capacidad de absorción de (hasta un 60%) tanto para el hormigón convencional como para el compactado con rodillo. En este artículo se calcula el comportamiento a tracción del hormigón reforzado con fibra mediante el análisis inverso de resultados de pruebas de flexión de varias composiciones de hormigón y fibras de acero. Se propone una relación multilinear que elimina en gran medida el problema de sobreestima, y puede conducir a diseños más seguros.

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Fibre‐reinforced concrete in fib Model Code 2010: principles, models and test validation

Cited by 176 publications

References 32 publications

Derivation of the σ‐w relationship for SFRC from prism bending tests

Derivation of the σ‐w relationship for SFRC from prism bending tests

Ultra High-Performance Fiber-Reinforced Concrete (UHPFRC): a review of material properties and design procedures

Post-cracking tensile behaviour of steel-fibre-reinforced roller-compacted-concrete for FE modelling and design purposes

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