Normality of Post-Crack Performance Data for Fiber-Reinforced Concrete

Bernard, E. S.; Xu, Gang

doi:10.1520/acem20180054

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…With the purpose of calibrating γ R , numerical simulations considering characteristic values of each of the involved mechanical variables were carried out. To this end, the values of f Rk for each FRC were established by assuming normal distribution of f R [91] and imposing values of the coefficient of variation for f R (CoV fR ). In this regard, based on the results extracted from a large FRC mechanical characterization program [92] and values of CoV fR derived from a numerical study on the intrinsic scatter of FRCs presented in [93], values of CoV fR of 10.0, 17.5 and 25.0% were found representative for FRC-8, FRC-6, and FRC-4, respectively.…”

Section: Ultimate Bending Capacity and Global Safety Factorsmentioning

confidence: 99%

Numerical-aided flexural-based design of fibre reinforced concrete column-supported flat slabs

Nogales

Fuente

2021

Engineering Structures

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Section: Ultimate Bending Capacity and Global Safety Factorsmentioning

confidence: 99%

Numerical-aided flexural-based design of fibre reinforced concrete column-supported flat slabs

Nogales

Fuente

2021

Engineering Structures

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“…fR,1k and fR,3k shall be computed considering that: fR follows a log-normal probability density distribution according to EN 1990 [13] (5% quantile, 75% of confidence level); and that the standard deviation of fR is unknown unless explicitly agreed. Criteria to determine the statistic properties of fR and to assess the population standard deviation could be found in [38,39]. The value of fR,1k establish the strength class: SC (1,0; 1,5; 2,0; 2,5; 3,0; 3.5; 4,0; 4.5; 5,0; 6,0; 7,0; 8,0) and the ductility class is denominated by a letter "a", "b", "c", "d" or "e" when the ratio fR,3k…”

Section: Strength and Ductility Classificationmentioning

confidence: 99%

Design of Steel Fibre Reinforced Concrete Structures According to the Annex L of the Eurocode-2 2023

Fuente¹,

Monserrat-López²,

Tošić³

et al. 2023

hya

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The Annex L of the new Eurocode – 2 gathers -for the first time- provisions for the design of Steel Fibre Reinforced Concrete (SFRC) structures. This response to the necessity of the construction sector for provisions and regulations of this composite material within the European space and this Annex is supported by the solid background derived from consistent research and experiences carried out along the last two decades. The existence of these design provisions could both favour competitiveness and enhance sustainability performance within the construction sector since new concrete reinforcement alternatives could be considered while ensuring the structural reliability level accepted for traditional reinforced concrete structures. This paper is aimed to cover -not exhaustively- all those features concerning SFRC included into the EC-2 and complement those -when considered necessary- with scientific literature.

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Section: Ultimate Bending Capacity and Global Safety Factorsmentioning

confidence: 99%

Non-linear finite element analysis oriented to optimisation of fibre reinforced concrete structures

Arroyo¹

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The construction industry is one of the industrial sectors with the largest output worldwide and, thus, of great economic interest. In this sector, reinforced concrete plays a significant role since it is one of the most used materials and particularly in the civil construction sector. This situation presents the research on concrete as a necessity. In the last decades, the addi-tion of fibres into concrete, for structural purpose, has been done for either partial or total sub-stitution of conventional reinforcement (steel rebar). This material is called fibre reinforced con-crete (FRC) and its main feature is its residual (post-cracking) strength, which means that tradi-tional linear elastic analyses are not recommended for implementation since they are not able to take full advantage of the material’s potential. In this sense, international and national codes and guidelines have included models to characterise the behaviour of this material. Technological breakthroughs in computational tools allow the simulation of FRC aided by non-linear finite element models. In this PhD thesis, by means of these models, different structural elements comprised of FRC currently built in the industry are analysed: precast tunnel segments excavated with tunnel boring machines (TBMs), column–supported elevated flat slabs and simply supported and two-span continuous beams. To this end, by means of constitutive models im-plemented through a finite element software, the models are calibrated and validated comparing the results with the outcomes obtained from experimental tests. Once this is done, the use of computational tools allows performing broad parametrical analysis to assess the performance of FRC structural elements. This thesis aims to deepen the knowledge of the behaviour of FRC and to contribute towards a better understanding of it in terms of research and structural design. The results derived from the conducted parametrical analyses are used for identifying which parameters have more influ-ence on the structural performance of the different FRC members: evaluating the influence of the residual flexural strength classes, on members with fibres as unique reinforcement, and the combination of the latter with rebar reinforcement ratio on members with hybrid reinforcement. As a result, optimised reinforcement configurations of members made of FRC and code modifi-cations are proposed. The proposed method along with the results are meant to support designers and decision makers to optimise FRC structures. Less material consumption will benefit the construction in-dustry productiveness, in terms of time and direct costs savings, whilst leading it towards a more sustainable production and improving the social perception associated with environmental factors. La industria de la construcción es uno de los sectores de mayor producción en el mundo y, por tanto, de mayor interés económico. En éste, el hormigón armado tiene un papel fundamental ya que es uno, si no el que más, de los materiales más empleados y de particular importan-cia para la construcción de obra civil. Este escenario sitúa la necesidad de investigación en este tipo de material en un primer plano. Desde hace varias décadas la incorporación de fibras al hormigón, para el uso estructural, se ha venido practicando ya sea para sustituir parcial o totalmente la armadura de acero convencional. A este material se le denomina hormigón reforzado con fibras (HRF) y su principal característica radica en su resistencia residual (resistencia después de la fisuración) y, por tanto, los tradicionales análisis lineales elásticos no son recomendables ya que no son capaces de sacar todo su potencial. A este respecto, distintas normativas y guías de diseño, nacionales e internacionales, ya han incorporado modelos para su caracterización. Avances en el desarrollo de herramientas computacionales permiten la simulación del HRF con la ayuda de modelos no-lineales de elementos finitos. En esta tesis doctoral, mediante estos modelos, se simulan distintos elementos estructurales compuestos de HRF de actual aplicación industrial: dovelas prefabricadas para túneles excavados con tuneladora, forjados de loza maciza para edificación y vigas simples y continuas. Para ello, mediante los modelos constitutivos del material implementados en un programa de elementos finitos, se calibran y validan los modelos comparándolos con los resultados de ensayos experimentales. Una vez hecho esto, el uso de las herramientas computacionales permite llevar a cabo amplios análisis paramétricos para evaluar el comportamiento estructural de elementos compuestos de HRF. El propósito de esta tesis es profundizar en el conocimiento en torno al comportamiento del HRF y contribuir a un mayor entendimiento del mismo tanto a nivel de investigación como de diseño estructural. Los resultados de los análisis paramétricos son usados para identificar aquellos parámetros que tiene una mayor influencia en el comportamiento estructural de los distintos elementos compuestos de HRF: analizar la influencia de las distintas clases de resistencias residuales, en miembros con fibras como único armado, y la combinación de ésta con la ratio de armado convencional en elementos con armado híbrido. Como resultado, se proponen configuraciones de armado optimizadas para los elementos estudiados y modificaciones en los distintos códigos estructurales. El método propuesto junto con los resultados está pensado como apoyo para diseñadores para optimizar el armado de estructuras compuestas de HRF. Un menor consumo del material ayudará a la industria a tener una mayor productividad, en cuestiones de ahorro de tiempo y costes directos, mientras la guía hacia una producción más sostenible y mejorando la percepción social asociada a factores medioambientales.

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Normality of Post-Crack Performance Data for Fiber-Reinforced Concrete

Cited by 3 publications

References 14 publications

Numerical-aided flexural-based design of fibre reinforced concrete column-supported flat slabs

Numerical-aided flexural-based design of fibre reinforced concrete column-supported flat slabs

Design of Steel Fibre Reinforced Concrete Structures According to the Annex L of the Eurocode-2 2023

Non-linear finite element analysis oriented to optimisation of fibre reinforced concrete structures

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