Experimental investigation on punching shear behaviour of RC-(R)UHPFRC composite flat slabs without transverse reinforcement

Sine, Aurélio; Pimentel, Mário; Nunes, Sandra

doi:10.1016/j.engstruct.2022.113951

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…As reviewed by Isufi and Ramos, 7 the use of HPFRC/ UHPFRC can improve the ultimate and serviceability limit states of flat slabs by increasing the punching shear capacity and controlling the internal cracking. Some previous studies have shown promising results of using UHPFRC for retrofitting flat slabs as investigated by Bastien-Masse and Brühwiler, 8 and Sine et al 9 Furthermore, the possibility of designing slabs with full and partial use of UHPFRC cast-in-situ was explored by Moreillon et al, 10 Zohrevand et al, 11 and Gołdyn and Urban. 12 More recently, Isufi et al 13 investigated the behavior of large-scale composite slabs with the hybrid use of normal strength concrete (NSC) and HPFRC.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear analysis of flat slab‐column connections to optimize the use of HPFRC under monotonic vertical loading

Díaz

Isufi

Trautwein

et al. 2022

Structural Concrete

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Numerous studies have shown that incorporating fibers in concrete can improve its mechanical properties, including tensile strength and toughness. Due to these outstanding properties, the use of fiber‐reinforced concrete (FRC) composites has been investigated for applications in structural members subjected to shear, in which brittle failure mode may occur. An example of this type of application is the use of high/ultrahigh‐performance fiber‐reinforced concrete (HPFRC/UHPFRC) in flat slab‐column connections as an alternative to shear reinforcement. The experimental results revealed that the use of advanced concrete materials led to an increase in the punching shear and deformation capacities. Despite these advantages, the use of HPFRC/UHPFRC in practical design is somehow limited by the lack of guidelines in codes for this type of new material. Furthermore, the study of constitutive models for nonlinear finite element analysis is also necessary. In this regard, this article addresses the simulation of two‐way slabs with HPFRC, subjected to concentrated monotonic vertical loading, tested in a previous experimental study, where the HPFRC was used only in a limited slab region around the column, and the rest of the slab was cast with normal strength concrete. The numerical models were developed in the commercial finite element software DIANA. The concrete nonlinear behavior was modeled by a total strain‐based constitutive model, in which the HPFRC softening is represented by a tensile stress‐crack width (σ − w) relationship. The validity of the numerical model is checked by the comparison with the experimental results and a punching shear mechanical model, leading to the formulation of a closed‐form equation. Finally, a parametric study was conducted to extrapolate the results obtained in the experimental campaign and to optimize the use of HPFRC to obtain a more economical and sustainable solution.

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Section: Introductionmentioning

confidence: 99%

Nonlinear analysis of flat slab‐column connections to optimize the use of HPFRC under monotonic vertical loading

Díaz

Isufi

Trautwein

et al. 2022

Structural Concrete

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“…In the meantime, the slab-column connection became less stressed, and the stress concentrations moved away from it. In 2022, Sine et al [11] conducted a study about the improvement of flat slabs, such as adding ultra-high-performance fiber-reinforced cementitious composites (UHPFRC) to existing reinforced concrete (RC) flat slabs increases their durability and flexural capacity significantly. Talib and Al-Salim [12] investigated the punching shear reinforcement placement with "the Ultrahigh Performance Concrete" (UHPC) and determined its optimal use in the shear area.…”

Section: Introductionmentioning

confidence: 99%

Punching Shear Behavior of Flat Slab Strengthen with Y-Type Perfobond Shear

Abdair¹,

Abbas²,

Hussain³

2022

MMEP

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This study demonstrates the behavior of a flat slab experimentally and numerically with two different types of shear reinforcements. Ten slabs were cast and tested in the experimental part. The samples were divided into two groups; the first consists of steel fiber, and the second has no steel fiber. Two control samples were considered with only flexural reinforcement, while the other eight samples had two types of shear reinforcement; the first was rebar to form a Y-shape, while the other was a steel plate formed as a Y-type perfobond. Shear reinforcement is provided by employing radial and parallel shear reinforcement. The tested samples in the experimental part have been simulated numerically using the Abaqus/CAE program. As a result of the laboratory examination, it was determined that the addition of steel fibers increased the ultimate load by (7.4% to 20.58%) for models with steel fibers compared to models without steel fibers. It was determined that the presence of steel plates in the models increased their capacity by 2.4% for ultimate load and by (6% to 50%) for deflection compared to ultimate load and deflection in models with steel bars. In Abaqus, the models with steel fibers were found to be 12.7%-26.6% stronger than those without them.

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Shear behavior of RC pile cap beams strengthened using ultra-high performance concrete reinforced with steel mesh fabric

Fayed

el-din

Basha

et al. 2022

Case Studies in Construction Materials

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Experimental investigation on punching shear behaviour of RC-(R)UHPFRC composite flat slabs without transverse reinforcement

Cited by 9 publications

References 18 publications

Nonlinear analysis of flat slab‐column connections to optimize the use of HPFRC under monotonic vertical loading

Nonlinear analysis of flat slab‐column connections to optimize the use of HPFRC under monotonic vertical loading

Punching Shear Behavior of Flat Slab Strengthen with Y-Type Perfobond Shear

Shear behavior of RC pile cap beams strengthened using ultra-high performance concrete reinforced with steel mesh fabric

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