Verification of structural elements made of FRC only: A critical discussion and proposal of a novel analytical method

Facconi, Luca; Minelli, Fausto

doi:10.1016/j.engstruct.2016.10.034

Cited by 20 publications

(11 citation statements)

References 17 publications

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“…FRC has several advantages when compared to conventional concrete, most notably in relation to residual flexural strength in its cracked state, enhanced toughness in flexure and tension, stress redistribution and crack control [9]. Because of these characteristics, when reinforced concrete elements are made with FRC it is possible to reduce the amount of conventional reinforcement and sometimes even completely eliminate it [22][23][24][25][26]. Typical examples of applications of FRC include floor slabs cast in situ and precast earth retaining units.…”

Section: Fibre-reinforced Concrete (Frc)mentioning

confidence: 99%

Fibre-Reinforced Concrete Is Sustainable and Cost-Effective for Water-Retaining Structures

Ryan

García-Taengua

2021

Sustainability

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Although fibre-reinforced-concrete (FRC) is increasingly used, it has been occasionally applied to water-retaining structures (WRSs), and no comprehensive design guidelines are currently available for the design of WRSs with FRC. A design methodology for such applications based on available recommendations and research has been applied to three reference scenarios representing a wide range of WRSs: a flood defence wall, a weir wall, and a swimming pool wall. For each of these scenarios, alternative designs using different FRC mix designs have been compared through the statistical analysis of several relevant parameters. This study confirms that the use of FRC significantly reduces reinforcement requirements when compared to conventional reinforced concrete solutions. Clear trends have been identified between the structural performance of the resulting WRS designs, the FRC mix characteristics and the fibre type and dimensions. This study has considered not only structural performance but also the total cost and environmental footprint per unit length of WRSs, and these considerations further the case for adoption of FRC in such applications. Overall, fibre dosages below 0.75% and 2% in volume for steel and synthetic fibres, respectively, can lead to WRS designs with lower cost and carbon footprint than their reinforced concrete counterparts.

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Section: Fibre-reinforced Concrete (Frc)mentioning

confidence: 99%

Fibre-Reinforced Concrete Is Sustainable and Cost-Effective for Water-Retaining Structures

Ryan

García-Taengua

2021

Sustainability

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“…Other analytical models, available in literature, could also be utilized for verifying ULS and SLS compliance. However, as Equation (11) was satisfied, the proposed reinforcement fulfills the ductility requirements of MC2010. Verification of punching resistance .…”

Section: Application Of the Proposed Design Procedure: A Case Studymentioning

confidence: 99%

Elevated slabs made of hybrid reinforced concrete: Proposal of a new design approach in flexure

Facconi

Plizzari

Minelli

2018

Structural Concrete

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When designing fiber-reinforced concrete (FRC) structures, one of the basic design issues is represented by the choice of a proper combination of fibers and conventional reinforcement that allows to obtain the best structural performance with the minimum amount of materials. The combination of rebars and fibers in the concrete matrix is generally known as Hybrid Reinforced Concrete (HRC). HRC represents a feasible solution in many structures; among these, slabs are gaining an increasing interest among practitioners. In fact, slabs are the most widespread structural elements in common practice as they are typically used to construct slabs on ground (industrial floors or foundations), slabs on piles (foundations) or elevated slabs. This paper focuses on the flexural design of FRC elevated slabs by using the most recent design provisions reported in the fib Model Code 2010. A simplified design procedure based on a consolidated design practice is proposed. Emphasis is given to the use of HRC to minimize the total reinforcement (fibers + rebars) in order to get practical and economic advantages during construction (ie, construction time and costs reduction). In more detail, a procedure for proportioning the hybrid reinforcement and then verifying the structural safety will be presented and discussed. Numerical nonlinear finite element analyses will be carried out to assess the effectiveness of the proposed design method. K E Y W O R D S design slabs, elevated slabs, fiber-reinforced concrete, hybrid-reinforced concrete, Model Code 2010, nonlinear finite element analysis

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“…Similarly, in Fiber-Reinforced Concrete (FRC) beams, the minimum fiber volume fraction Vf,min can be defined as As,min in LRC beams [21][22][23]. In other words, when the content of fiber is Vf,min, the transition from deflection-softening (i.e., the brittle response) to deflection-hardening (i.e., the ductile response) occurs [23,24]. If the minimum reinforcement of HRC beams is evaluated as in those LRC are, the resisting contribution of fibers is not exploited, making the use of fiber-reinforcement useless.…”

Section: Introductionmentioning

confidence: 99%

Scaled Approach to Designing the Minimum Hybrid Reinforcement of Concrete Beams

Gorino

Fantilli

2020

Materials

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To study the brittle/ductile behavior of concrete beams reinforced with low amounts of rebar and fibers, a new multi-scale model is presented. It is used to predict the flexural response of an ideal Hybrid Reinforced Concrete (HRC) beam in bending, and it is validated with the results of a specific experimental campaign, and some tests available in the technical literature. Both the numerical and the experimental measurements define a linear relationship between the amount of reinforcement and the Ductility Index (DI). The latter is a non-dimensional function depending on the difference between the ultimate load and the effective cracking load of a concrete beam. As a result, a new design-by-testing procedure can be established to determine the minimum reinforcement of HRC elements. It corresponds to DI = 0, and can be considered as a linear combination of the minimum area of rebar (of the same reinforced concrete beam) and the minimum fiber volume fraction (of the same fiber-reinforced concrete beam), respectively.

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Verification of structural elements made of FRC only: A critical discussion and proposal of a novel analytical method

Cited by 20 publications

References 17 publications

Fibre-Reinforced Concrete Is Sustainable and Cost-Effective for Water-Retaining Structures

Fibre-Reinforced Concrete Is Sustainable and Cost-Effective for Water-Retaining Structures

Elevated slabs made of hybrid reinforced concrete: Proposal of a new design approach in flexure

Scaled Approach to Designing the Minimum Hybrid Reinforcement of Concrete Beams

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