Experimental and numerical study of the flexural behaviour of ultra-high performance fibre reinforced concrete beams

Singh, Manpreet; Sheikh, Abdul Hamid; Ali, M.S. Mohamed; Griffith, Michael

doi:10.1016/j.conbuildmat.2017.02.002

Cited by 180 publications

(97 citation statements)

References 23 publications

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“…e de ection at the midspan of each test beam was measured during the bending tests and used to calculate the ductility index. e ductility of the beam was calculated by Equation (2), which was suggested by Singh et al [27].…”

Section: Ductilitymentioning

confidence: 99%

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

Yang

Joh

Kim

2018

Advances in Materials Science and Engineering

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The flexural responses of high-strength fiber-reinforced concrete (HSFRC) beams and high-strength concrete (HSC) beams are compared in this study. A series of HSFRC and HSC beams were tested under pure flexural loading. The effects of the type of concrete, compressive strength of the concrete, and tensile rebar ratio on the flexural behavior of the concrete beams were investigated. The flexural behavior of the HSFRC and HSC beams including the induced crack and failure patterns, load and deflection capacity, crack stiffness, ductility index, and flexural toughness was compared. The crack stiffness of the HSC and HSFRC beams increased with the rebar ratio. For the same rebar ratios, the crack stiffness of the HSFRC beams was much greater than that of the HSC beams. The ductility index of the HSC beams decreased sharply with an increase in the rebar ratio, but the ductility index of the HSFRC beams did not show a clear decrease with increasing rebar ratio. The flexural toughness of the HSFRC beams was greater than that of the HSC beams at higher rebar ratios of 1.47% and 1.97%, indicating that the energy absorption of the HSFRC beams was greater than that of the HSC beams. Test results also indicated that HSFRC developed better and more consistent ductility with higher rebar ratio. In addition, the tested bending strength and sectional analysis results were compared.

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Section: Ductilitymentioning

confidence: 99%

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

Yang

Joh

Kim

2018

Advances in Materials Science and Engineering

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“…The tensile behavior is also available in Visintin et al and a summary of the obtained stress‐crack width relationships is given in Figure . These results were obtained under uniaxial direct tension, using the methodology and specimens developed by Singh et al…”

Section: Experimental Programmentioning

confidence: 99%

Local bond slip behavior of steel reinforcing bars embedded in ultra high performance fibre reinforced concrete

Sturm

Visintin

2018

Structural Concrete

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The local bond stress slip behavior is a fundamental property required for the analysis and design of concrete structures at both serviceability and at ultimate limit. The addition of fibers has been shown to significantly improve the bond between normal strength concrete and steel reinforcement but little work has investigated the bond between reinforcing and ultra high performance fibre reinforced concrete (UHPFRC). In this paper a series of 69 pull tests are carried out on UHPFRC with either short straight or long hooked steel fibers including mixes where the two fiber types have been blended. The results of this study were combined with the results from existing literature to regress a material model for the bond slip behavior between UHPFRC and ribbed steel reinforcing bars. Importantly, it is shown that models for normal strength fiber reinforced concrete cannot be extrapolated to UHPFRC.

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“…Além disso, os modelos numéricos, que são uma boa alternativa aos ensaios experimentais, consideram, em sua maioria, o UHPFRC como material homogêneo (CHEN; GRAYBEAL, 2012;MAHMUD et al, 2013;MAO et al, 2014;AWINDA et al, 2016;THAI;KIM, 2016;AL-OSTA et al, 2017;SINGH et al, 2017;BAHIJ et al, 2018;HUSSEIN;AMLEH, 2018;KRAHL et al, 2018). Apesar de essa consideração ser representativa, o fato de não discretizar as fibras na matriz cimentícia impossibilita investigar adequadamente os efeitos da sua distribuição no comportamento do elemento modelado.…”

Section: Considerações Iniciais E Justificativaunclassified

“…O UHPFRC, em particular, tem sido atraente para uso em elementos estruturais em que a flexão prevalece, devido à sua excelente ductilidade pós-fissuração sob tensão de tração na flexão. Assim, o emprego do UHPFRC em vigas pré-moldadas é bastante satisfatório, pois se sabe que vigas são elementos estruturais projetados para trabalhar predominantemente à flexão (YANG et al, 2010;YOO;YOO et al, 2016b;SINGH et al, 2017;HASGUL et al, 2018;YANG et al, 2018) 2012;YOO et al, 2014;BOULEKBACHE et al, 2016).…”

Section: Aplicaçõesunclassified

“…A ductilidade das vigas de UHPFRC-1 e UHPFRC-2 foi quantificada por meio do índice de ductilidade de deslocamento vertical no meio do vão, como realizado por Yoo e Yoon (2015), Singh et al (2017) e Hasgul et al (2018. Os índices de ductilidade foram determinados pela Equação (6.1), conforme proposto por Shin et al (1989) As curvas momento-curvatura das vigas de UHPC, UHPFRC-1 e UHPFRC-2 apresentaram-se lineares até o início da fissuração.…”

Section: Ductilidadeunclassified

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Estudo numérico e experimental da distribuição das fibras de aço em vigas de UHPFRC

Oliveira¹

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O concreto de ultra-alto desempenho (UHPC, sigla em inglês) é um material que apresenta alta resistência à compressão e durabilidade. Quando reforçado com fibras de aço (UHPFRC, sigla em inglês), passa a exibir um comportamento dúctil, alta resistência à tração e à flexão. A distribuição das fibras influencia significativamente o comportamento mecânico e estrutural desse material, sendo fundamental considerá-la nos estudos experimentais e numéricos.Entretanto, experimentalmente, há poucas investigações sobre a distribuição das fibras em elementos estruturais de UHPFRC, e, numericamente, a maioria dos modelos consideram-no homogêneo, o que impossibilita representar adequadamente tal distribuição. Nesse sentido, esta pesquisa objetiva investigar experimentalmente a influência das fibras e propor um modelo numérico em elementos finitos para o UHPFRC com fibras discretizadas e embutidas na matriz. Na etapa experimental, foram realizados ensaios de caracterização do UHPC e UHPFRC (1% e 2% de fibras) e de flexão em cinco vigas produzidas a partir desses concretos, cujos resultados confirmaram melhor desempenho ao UHPFRC (tanto no âmbito material quanto no estrutural).Além disso, foi realizada a análise de imagem por fotografia de alta resolução nas vigas de UHPFRC, que revelaram uma orientação preferencial das fibras. Numericamente, para possibilitar a representação da distribuição das fibras, visando a um menor custo computacional, elas foram discretizadas como elementos de treliça embutidos nos elementos que modelam a matriz (aderência perfeita). Assim, o deslizamento relativo da interface fibra/matriz foi representado no modelo constitutivo das fibras, por meio de uma lei tensão-deformação equivalente baseada no comportamento de arrancamento da fibra. A validação dessa estratégia numérica foi realizada modelando e simulando no ABAQUS os ensaios de caracterização (tração uniaxial e flexão a três pontos) e de flexão das vigas realizados experimentalmente. De modo geral, os resultados numéricos indicaram uma boa correlação com os resultados experimentais. Contudo, algumas sugestões foram propostas a fim de aprimorar o modelo numérico proposto. Palavras-chave: UHPFRC. Fibras. Vigas. Análise de imagem. Método dos elementos finitos. Elementos discretos embutidos.Ultra-high performance concrete (UHPC) is a material with high compressive strength and durability. When reinforced with steel fibers (UHPFRC) it becomes to exhibit a ductile behaviour and high tensile and flexural strength. Distribution of fibers significatively influences mechanical and structural behaviour of this material, and hence it has to be considered both in experimental and numerical studies. However, there are few experimental investigations on the fibers distribution in UHPFRC structural elements and, additionally, most of the numerical models consider this material as homogeneous, which makes it impossible to adequately represent such distribution. In this context, this research aims to experimentally investigate the influence of fibers distribution ...

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Experimental and numerical study of the flexural behaviour of ultra-high performance fibre reinforced concrete beams

Cited by 180 publications

References 23 publications

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

Local bond slip behavior of steel reinforcing bars embedded in ultra high performance fibre reinforced concrete

Estudo numérico e experimental da distribuição das fibras de aço em vigas de UHPFRC

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