A new design method for steel fibre reinforced concrete pipes

Fuente, Albert de la; Escariz, Renata Campos; Figueiredo, Antônio Domingues de; Molins, Climent; Aguado, Antonio

doi:10.1016/j.conbuildmat.2011.12.015

Cited by 76 publications

(49 citation statements)

References 10 publications

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“…The study conducted by de la Fuente [6] found that the CV of the residual load measured in the test of concrete pipes with plastic fibres was between 2.4% and 9.8%, with an average of 7.0%. In a similar study with steel fibres [12], the author found a CV between 3.8% and 9.8% (6.8% on the average).…”

Section: Introductionmentioning

confidence: 89%

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 The answer to this question, although not definitive, comes from the analysis of the reports from other authors that tested bigger specimens or real scale elements. As mentioned before, several authors indicate that the CV measured in the tensile residual response of real scale or larger elements is between 2% and 10% [5,6,11,12]. This range is considerably below the considered for the bending test that commonly shows CV between 10% and 30% [2,10].…”

Section: Limit Of Applicationmentioning

confidence: 99%

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Intrinsic scatter of FRC: an alternative philosophy to estimate characteristic values

Cavalaro

Aguado

2014

Mater Struct

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Abstract:The results from small scale laboratory tests of fibre reinforced concrete (FRC) usually show a high scatter. However, several studies indicate that the real scatter on the postcracking response of the material reduces considerably with the increase of the size of the elements tested. Such observations highlights a possible contradiction in the design of FRC since the characteristic values estimated from small scale tests might not be representative of large scale structures. This could penalize the material, leading to higher fibre consumption, less competitive solutions and problems in the quality control. The main objective of the present study is to address this fundamental issue. The aim is to evaluate the scatter that is intrinsic to the FRC and how it is affected by the size of the element, the type of concrete, the type and content of fibre. For that, a novel numerical approach is proposed for the simulation of the material and its variability. Then, an extensive parametric study is conducted with more than 35000 models, each one unique in terms of fibre distribution. Based on this analysis, equations are proposed to estimate the intrinsic scatter depending on several parameters. Finally, an alternative formulation is defined to estimate the characteristic value of the FRC considering the real structure in which it will be applied. The results derived from this study represent a contribution towards a more efficient design of structures and the reduction of the non-conformities in the quality control of the FRC. representative of large scale structures. This could penalize the material, leading to higher fibre consumption, less competitive solutions and problems in the quality control. The main objective of the present study is to address this fundamental issue. The aim is to evaluate the scatter that is intrinsic to the FRC and how it is affected by the size of the element, the type of concrete, the type and content of fibre. For that, a novel numerical approach is proposed for the simulation of the material and its variability. Then, an extensive parametric study is conducted with more than 35000 models, each one unique in terms of fibre distribution.Based on this analysis, equations are proposed to estimate the intrinsic scatter depending on several parameters.Finally, an alternative formulation is defined to estimate the characteristic value of the FRC considering the real structure in which it will be applied. The results derived from this study represent a contribution towards a more efficient design of structures and the reduction of the non-conformities in the quality control of the FRC.

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Section: Introductionmentioning

confidence: 89%

Section: Limit Of Applicationmentioning

confidence: 99%

Intrinsic scatter of FRC: an alternative philosophy to estimate characteristic values

Cavalaro

Aguado

2014

Mater Struct

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“…In fact, the equations to predict the fibre content and orientation may not apply to specimens with other shapes that do exhibit such symmetry. This complicates the use of the method in existing structures (for instance segmental linings [19], pipes [20] or slabs [21]) due to the difficulty to obtain cubic extracted cores. In this context, the possibility of performing the test in cylindrical specimens would represent an improvement.…”

Section: Figure 1 Inductive Methods By Torrents Et Al [1] (A) and Prmentioning

confidence: 99%

Assessment of fibre content and 3D profile in cylindrical SFRC specimens

et al. 2015

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The inductive method proposed by Torrents et al. [1] and improved by Cavalaro et al. [2] is used to assess the fibre content and distribution in steel fibre reinforced concrete, providing valuable information for the design and the quality control. Despite several advantages, the method presents limitations. On one hand, it was conceived for the test of cubic specimens, which complicates its application in existing structures due to the difficulty to extract cubic cores. On the other hand, only a partial characterization of the fibre orientation is obtained given that the determination is restricted to the three axes of the specimen. With these measurements, it is not possible to derive the fibre orientation in other directions different from the ones used to test the sample. The objective of this paper is to propose an assessment of the fibre content and distribution in any direction using the inductive method and cylindrical specimens. For that, first a modification of the method is proposed. Then, new equations are deducted to generalize the test to samples with different shapes and to assess the anisotropy level as well as the directions with the maximum and the minimum fibre contribution. Next, an extensive experimental program and FEM numerical simulations are performed to validate and to determine the accuracy of the formulation developed. The results show that the application of these equations and the execution of only one additional measurement per specimen are enough to determine the fibre profile in all in-plane directions with a high accuracy.

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“…Para ello, en este estudio se ha empleado el modelo de Análisis de Secciones Evolutivas (AES) [24,25] desarrollado por los mismos autores de este trabajo. Este modelo ha sido calibrado y contrastado con resultados experimentales obtenidos en diferentes campañas experimentales [26][27][28][29].…”

Section: Introductionunclassified

Diseño óptimo de dovelas de hormigón reforzado con fibras para el revestimiento de túneles

Fuente

Blanco²,

Pujadas³

et al. 2014

Hormigón y Acero

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A new design method for steel fibre reinforced concrete pipes

Cited by 76 publications

References 10 publications

Intrinsic scatter of FRC: an alternative philosophy to estimate characteristic values

Intrinsic scatter of FRC: an alternative philosophy to estimate characteristic values

Assessment of fibre content and 3D profile in cylindrical SFRC specimens

Diseño óptimo de dovelas de hormigón reforzado con fibras para el revestimiento de túneles

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