Prediction of steel fibre reinforced concrete under flexure from an inferred fibre pull-out response

Prudêncio, Luiz Roberto; Austin, Simon A.; Jones, P. A.; Armelin, Hugo A.; Robins, Peter J.

doi:10.1617/s11527-006-9091-2

Cited by 32 publications

(15 citation statements)

References 8 publications

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“…9 indicate some very significant differences. In particular, the crack-width at peak load of the probabilistic fibre pull-out curve (occurring at around 1.2 mm) is very different from that suggested by Prudencio et al [17] and Armelin and Banthia [3], where peak load occurs at around 0.1 mm. In addition, the general shape of the probabilistic curve is very different from the other author's curves.…”

Section: /14contrasting

confidence: 80%

“…9 which compares the probabilistic curves shown in Fig. 3 with similar curves obtained from single fibre pull-out tests by Armelin and Banthia [3] and an inferred single fibre pull-out response, determined from a related study [17], using back analysis from the load-deflection responses of seven beams from series 75C(40), four of which are shown in Fig 6. In respect of the work of Armelin and Banthia [3] they adopted a similar approach to that described herein to determine their average single fibre pull-out curve, except that they assumed a random 3-D fibre distribution and incorporated a separate contribution for the strength of the fibre hook. However, it is not clear how the shape and magnitude of the contribution of the hook was determined.…”

Section: /14mentioning

confidence: 56%

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Predicting the flexural load–deflection response of steel fibre reinforced concrete from strain, crack-width, fibre pull-out and distribution data

2007

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A semi-analytical model is presented, based on conventional principles of mechanics, to predict the flexure behaviour of steel fibre reinforced concrete. The model uses a stress-block approach to represent the stresses that develop at a cracked section by three discrete stress zones: (a) a compressive zone; (b) an uncracked tensile zone; and (c) a cracked tensile zone. It is further shown that the stress-block, and hence flexural behaviour, is a function of five principal parameters: compressive stress-strain relation; tensile stress-strain relation; fibre pull-out behaviour; the number and distribution of fibres across the cracked section in terms of their positions, orientations and embedment lengths; and the strain/crack-width profile in relation to the deflection of the beam. An experimental investigation was undertaken on both cast and sprayed specimens to obtain relationships for use in the model. The results of the study showed a reasonable agreement between the model predictions and experimental results. However, the accuracy of the model is probably unacceptable for it to be currently used in design. A subsequent analysis highlighted the single fibre pull-out test and the sensitivity of the strain analysis tests as being the main cause of the discrepancies. IntroductionSteel fibre reinforced concrete (SFRC) continues to grow in specialist applications that can utilise its flexibility and enhanced toughness performance, notably sprayed concrete and industrial floors. However, its continued development has been hindered by a general lack of confidence in its design, particularly under flexural load. This is mainly due to a lack of suitable analytical design methods and appropriate material property tests that measure flexural toughness (or strength) parameters. This need is highlighted by the recent RILEM TC162-TDF [1] proposals for test and design methods.Although recent developments in flexural toughness characterisation have attempted to address the latter of these shortcomings, flexural behaviour of SFRC will be better understood, and thereby predicted, if crack formation and the associated fibre reinforcing mechanisms at the critical section can be explicitly considered in terms of the strain distribution, crack-width and deflection of the beam. To this end, the stress-profile concept potentially offers the most acceptable flexural modelling approach because it is simple to understand; uses conventional principles of structural mechanics, and could, therefore, be incorporated into a design rationale similar to that used for conventional reinforced concrete.A variety of stress-profile models have been proposed for predicting the load-deflection behaviour of SFRC by utilising the equilibrium of forces at the cracked section [2][3][4][5]. These models have generally adopted a semi-analytical approach, whereby failure is assumed to occur at a single crack with rigid-body motion of the two broken halves, rotating about a plastic hinge, being the dominant mechanism.The kinematics of failure has bee...

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Section: /14contrasting

confidence: 80%

Section: /14mentioning

confidence: 56%

Predicting the flexural load–deflection response of steel fibre reinforced concrete from strain, crack-width, fibre pull-out and distribution data

2007

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“…Prudencio et al [29] present an approach where the average pullout response of the fibers bridging the cracked zone is inferred from flexural tests. A stress-block approach is used to represent the stresses that develop at a cracked section.…”

Section: Direct Approachmentioning

confidence: 99%

Application of constitutive models in European codes to RC–FRC

Blanco

Pujadas

Fuente

et al. 2013

Construction and Building Materials

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The recent publication of codes for the design of FRC is a major step towards extending the use of the material. An in depth analysis indicates several differences between the constitutive models proposed in the existing codes. In this study, these models are compared and a numerical simulation is performed to evaluate their differences in terms of the structural behavior predicted and measured in an experimental program of RC-FRC elements. The predictions provided by the models fit satisfactorily the experimental results for elements with steel fibers and with plastic fibers

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“…The mechanical behaviour of such a material depends on the amount, orientation and spatial distribution of fibres and the particular fibre geometry, as well as design of the cementitious matrix mix and the way of concrete mix placement into the mould (Swamy, Mangat 1974;Yazici et al 2007;Bencardino 2013;Bencardino et al 2008Bencardino et al , 2013Kurihara et al 2000;Barros, Cruz 2001). Structural models simulated SFRC prisms mechanical behaviour under bending were observed in Pupurs (2011), Li andMobasher (1998), Prudencio et al (2007) and Jones et al (2007). Pull-out tests with different fibres were performed and reported in Pupurs (2011), Robins et al (2002, Kononova (2009) andNg et al (2010).…”

Section: Sfrc Cracking Process Numerical Modellingmentioning

confidence: 99%

Effect of Short Fibers Orientation on Mechanical Properties of Composite Material – Fiber Reinforced Concrete

Lūsis

Krasņikovs

Kononova

et al. 2017

Journal of Civil Engineering and Management

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Traditional fiberconcrete structures have fibres in the mix oriented in all spatial directions, distributed in the structural element volume homogenously, what not easy to obtain in practice. In many situations, structurally more effective is the insertion of fibres into the concrete structural element body by forming layers, with a predetermined fibre concentration and orientation in every layer. In the present investigation, layered fibre concrete is under investigation. Short steel fibres were attached to flexible warps with the necessary fibres concentration and orientation. Warps were placed into the prismatic mould separating them by concrete layers without fibres. Prisms were matured and tested under four-point bending. The bending-affected mechanical behaviour of cracked fibre concrete was simulated numerically by using a developed structural model. Comparing the simulation results with experimental data, material micromechanical fracture mechanisms were analysed and evaluated.

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Prediction of steel fibre reinforced concrete under flexure from an inferred fibre pull-out response

Cited by 32 publications

References 8 publications

Predicting the flexural load–deflection response of steel fibre reinforced concrete from strain, crack-width, fibre pull-out and distribution data

Predicting the flexural load–deflection response of steel fibre reinforced concrete from strain, crack-width, fibre pull-out and distribution data

Application of constitutive models in European codes to RC–FRC

Effect of Short Fibers Orientation on Mechanical Properties of Composite Material – Fiber Reinforced Concrete

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