Application of constitutive models in European codes to RC–FRC

Blanco, Ana; Pujadas, Pablo; Fuente, Albert de la; Cavalaro, Sérgio Henrique Pialarissi; Aguado, Antonio

doi:10.1016/j.conbuildmat.2012.09.096

Cited by 81 publications

(53 citation statements)

References 23 publications

(21 reference statements)

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“…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%

“…As an example, Figure 1 presents the average scatter in the residual strength measured in the bending test EN 14651 by different authors from the literature for crack mouth opening displacements of 0.5 mm (f R,1 ), 1.5 mm (f R,2 ), 2.5 mm (f R,3 ) and 3.5 mm (f R,4 ) [1][2][3][4]. Notice that the CV is on the average 15%, which is considerably higher than the observed in the compressive and the tensile strength tests of concrete.…”

Section: Introductionmentioning

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: Limit Of Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Cavalaro

Aguado

2014

Mater Struct

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“…En el modelo AES se han implementado todas las ecuaciones constitutivas sugeridas en los códigos europeos. En estas, se ha adoptado la ecuación trilineal tipo σ c -ε c propuesta en el MC 2010 por tratarse de un referente internacional y que conduce a resultados suficientemente fidedignos según los estudios llevados a cabo en [28] y [32]. En la figura 6b se presenta la curva constitutiva empleada en este trabajo, así como las expresiones utilizadas para evaluar los puntos (σ i y ε i ) que definen la misma.…”

Section: A De La Fuente Et Al / Hormigón Y Acero XXX (2014) Xxx-xxxunclassified

“…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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Referencia Nº: 9Fax: +34 932 091 136Estimado/a autor/a, En el caso que durante la preparación de su manuscrito hubiera surgido alguna duda o comentario, podrá encontrarlos en el listado que aparece a continuación y señalados en el margen de la prueba. Le rogamos que revise detenidamente la prueba que le enviamos y señale al margen sus correcciones, si las hubiera, o bien nos envíe un texto aparte detallando los cambios necesarios.En caso de que las correcciones afecten a las ilustraciones, por favor, consulte las instrucciones en: http://www.elsevier.com/ artworkinstructions. Citas cruzadas:Si en el artículo se hace referencia a otros artículos incluidos en el mismo número, le rogamos que compruebe que se han añadido las palabras "este número" tanto en la bibliografía como en el texto. Referencias no citadas:En el caso de que existan referencias que se incluyen en la bibliografía pero que no se citan en el texto, se le indicará al final de la prueba. Por favor, cite cada referencia en la parte del texto donde debería aparecer o elimínela de la bibliografía. Faltan referencias: En el caso de que se citen en el texto referencias que no aparecen en la bibliografía, se le indicará al final de la prueba. Por favor, complete la bibliografía o elimine las referencias del texto. Situación en el Dudas / comentarios artículo Por favor, introduzca su respuesta o corrección en la línea correspondiente de la prueba Q1Por favor, confirme que nombre (givenname) y apellido/s (surname) están identificados correctamente. Los colores distintos indican si se ha etiquetado como nombre o apellido. Tenga en cuenta que la adecuada identificación es fundamental para la correcta indexación del artículo. Q2Las definiciones de y c y de y cdg son idénticas. Por favor, revise este aspecto. Q3Por favor, considere la conveniencia de expandir esta primera aparición de la sigla «ELU». Q4Por favor, considere la conveniencia de expandir esta primera aparición de la sigla «ELS». Q5Por favor, facilite la abreviatura de esta revista. Q6Por favor, facilite la abreviatura de esta revista. Q7Por favor, facilite la abreviatura de esta revista. Q8Por favor, facilite la abreviatura de esta revista. Q9Por favor, facilite la abreviatura de esta revista. Q10Por favor, facilite la abreviatura de esta revista. Q11Por favor, facilite la abreviatura de esta revista. Q12Por favor, facilite, si es posible, los datos actualizados de esta referencia.Por favor, marque esta casilla o especifique su aprobación si no tiene correcciones que realizar en el archivo PDF Problemas con los archivos electrónicosEn ocasiones los archivos originales de texto o de imágenes no se pueden abrir o procesar correctamente. En caso de que los archivos de su artículo hayan presentado estos problemas, hemos procedido de la siguiente manera: ResumenEl uso del hormigón reforzado con fibras (HRF) para la fabricación de dovelas de hormigón reforzado con fibras es una práctica en aumento. Sin embargo, aún existe cierta inercia al cambio respecto a la solución tradicional de hormigón armado con...

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“…More recently, recommendations about the design of FRC structures were also included in the MC 2010 [10], with constitutive equations [11][12] and models for the Service Limit State and Ultimate Limit State (SLS and the ULS, respectively). An increase in the use of FRC in tunnels segments has been observed as a result of that [13].…”

Section: Introductionmentioning

confidence: 99%

Design of FRC tunnel segments considering the ductility requirements of the Model Code 2010

Fuente

Cavalaro

et al. 2015

Tunnelling and Underground Space Technology

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Fibre reinforced concrete (FRC) is used to improve the mechanical response of precast segments for tunnels. The structural use of the material has been regulated by national codes and, recently, by the Model Code 2010 (MC 2010, hereinafter). In this regard, it is necessary to update the philosophy applied to the design of tunnel segments in compliance with the most recent guidelines, evaluating their applicability and repercussion. The objective of this paper is to present a critical analysis of the design of FRC segments according to the ductility requirements from the MC 2010; an alternative approach is proposed that is compatible with the condition found in some tunnels. The repercussions of both approaches are evaluated for the Metro Line 9 from Barcelona using results obtained in an experimental program with full-scale segments. The study suggests that the alternative approach may be applied under certain conditions, leading to a reduction in the fibre consumption. Keywords: Barcelona Metro Line, Cracking bending moment, design, ductility, FRC, precast segments.Tunnelling and Underground Space Technology 2 INTRODUCTIONFibre reinforced concrete (FRC) is a composite material used to improve the mechanical response of precast segments for tunnels [1][2][3][4], enhancing their ductility and fire resistance as well as their mechanical performance during transient load stages. Due to these advantages, the use of structural fibres contributes to the replacement of traditional passive reinforcement, accelerating the production process and increasing the competitiveness of the FRC. Proof of this are the numerous experiences in which precast FRC segments have been used in highway (RT), railway (RWT), metro (MT), water supply (WTT), gas transport (GPT) and service (ST) tunnels. Table 1 [4][5][6] summarizes some of the main applications already in service or under construction.The structural use of fibres has been regulated by the national codes in Germany in 1992 [7], Italy in 2006 [8] and Spain in 2008 [9], for instance. More recently, recommendations about the design of FRC structures were also included in the MC 2010 [10], with constitutive equations [11][12] and models for the Service Limit State and Ultimate Limit State (SLS and the ULS, respectively). An increase in the use of FRC in tunnels segments has been observed as a result of that [13]. In this regard, it is necessary to update the philosophy applied to the design of tunnel segments in compliance with the particular requirements proposed in the MC 2010, evaluating its applicability and repercussions.The objective of this paper is to present a critical analysis of the design of FRC segments according to the ductility requirements from the MC 2010 and to propose an alternative approach more compatible with the conditions found in practice. First, the design procedure from the MC 2010 is analysed and adapted to FRC segmented linings. Then, the alternative approach is presented. The applicability and repercussion of both approaches in terms of fibre ...

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Application of constitutive models in European codes to RC–FRC

Cited by 81 publications

References 23 publications

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

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

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

Design of FRC tunnel segments considering the ductility requirements of the Model Code 2010

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