On the reliability of the design approach for FRC structures according to<i>fib</i>Model Code 2010: the case of elevated slabs

Prisco, Marco di; Martinelli, Paolo; Parmentier, Benoît

doi:10.1002/suco.201500151

Cited by 31 publications

(34 citation statements)

References 30 publications

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“…Slabs on pile and elevated slabs have been successfully built and tested with only steel fibres with a dosage in the range of 45 kg/m 3 and 100 kg/m 3 [29,30] for industrial, commercial, and residential buildings, with the presence of continuous steel rebars for connecting columns. To check the structural behaviour of SFRC slabs without any longitudinal reinforcement, an elevated flat slab with 9 bays built on 16 circular columns with a 6 m span for each panel and a thickness of 200 mm, reinforced only with 70 kg/m 3 of steel fibres (60 mm long and with a diameter of 1 mm) was tested in Limelette (Belgium) both in SLS and ULS conditions [31,32]. A fully plastic behaviour was observed at the maximum load which occurred at a load higher than the prediction.…”

Section: Introductionmentioning

confidence: 99%

Biaxial bending of SFRC slabs: Is conventional reinforcement necessary?

2018

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Fibre reinforced concrete shows enhanced performance in statistically redundant bi-dimensional structural elements that undergo biaxial bending. However, the lack of reinforcing rebars in fibre reinforced structural elements may affect the structural ductility which may further affect the overall load bearing capacity of these structures. To investigate the influence of fibres in such elements, six concrete plates of 2000 9 2000 9 150 mm reinforced with steel fibres and/or reinforcing rebars are tested under a central concentrated load. Two of the elements are reinforced with only 35 kg/m 3 of steel fibres, two are reinforced with 2-way conventional reinforcing rebars (35 kg/m 3 , in each direction) and two are reinforced with both steel fibres and rebars. The specimens are simply supported at the middle of each side by means of a bilateral restraint; the deflection response and cracking behaviour of all the specimens are recorded and compared. Moreover, the methodology introduced in the fib Model Code 2010 for design of steel fibre reinforced concrete is implemented to predict the ultimate load bearing capacity of these elements and its reliability is determined in comparison with the experimental values. The comparison of the behaviour of the specimens reinforced only with steel fibres, with those reinforced with steel rebars, shows the higher efficiency of steel fibres in terms of load carrying capacity, but with a lower ductility. The combination of steel fibres and rebars allows for a better exploitation of the capacity of both reinforcement solutions. Finally, the reliability of the approach implemented for the ultimate load prediction is shown and the need of rebars in providing ductility in fibre reinforced concrete members is underlined.

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Section: Introductionmentioning

confidence: 99%

Biaxial bending of SFRC slabs: Is conventional reinforcement necessary?

2018

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“…During the past decade, the use of discontinuous steel fibers has been a well‐known and widely employed methodology to enhance the toughness and tensile performance of concrete. After several years of deep investigation, fiber RC (FRC) is currently acknowledged as a structural material and its design procedure is available in the newest national and international structural codes 4‐13 . Some researchers proved that discontinuous steel fibers can be considered as the only material in slabs on grade able to provide high internal redundancy .…”

Section: Introductionmentioning

confidence: 99%

Influence of polypropylene fibers on the flexural behavior of reinforced concrete slabs with different opening shapes and sizes

Al-Rousan

2017

Structural Concrete

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Funding informationNone.The effect of polypropylene fibers (PF) on the flexural behavior of reinforced concrete one-way slabs with opening was investigated in this paper. The evaluated parameters included four different PF volume percentages (0, 0.3, 0.6, and 0.9%), with and without opening, two opening shapes (square and circular), and three opening sizes (100, 150, and 200 mm). Three groups of tested slabs were casted: without opening, with square opening, and circular opening, resulting in a total of 28 slabs. The behavior of each slab was evaluated in terms of the cracking load, ultimate capacity, initial and yielding stiffness, deflection ductility, and energy ductility. In addition, the steel and concrete strains, crack opening, and mode of failure were measured and monitored. The minimum design load capacities were calculated theoretically based on the sectional analysis and compared with the tested ones. The results showed that the use of PF at percentages greater than 0.6% significantly enhanced the performance parameters of the slabs with small opening size (2% opening ratio) and provided acceptable enhancement for slabs with large opening size (8% opening ratio). Therefore, the PF can be optimized to substitute the conventional steel reinforcement of slabs with small openings, especially circular openings. K E Y W O R D S flexural behavior, polypropylene fiber, reinforced concrete, sectional analysis, slab opening

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“…The tensile properties of the FRCs (see Table ) used in the simulation of the Limelette and Bissen slabs were derived from test results reported by di Prisco et al and Soranakom et al, respectively. FRC used in the Limelette slab contained 60 kg/m 3 of low‐carbon hooked‐end steel fibers having a total length of 60 mm, a diameter of 1 mm, and a tensile strength of 1,450 MPa.…”

Section: Validation Of the Numerical Finite Element Modelmentioning

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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On the reliability of the design approach for FRC structures according tofibModel Code 2010: the case of elevated slabs

Cited by 31 publications

References 30 publications

Biaxial bending of SFRC slabs: Is conventional reinforcement necessary?

Biaxial bending of SFRC slabs: Is conventional reinforcement necessary?

Influence of polypropylene fibers on the flexural behavior of reinforced concrete slabs with different opening shapes and sizes

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

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