Experimental study of flexural behaviour of layered steel fibre reinforced concrete beams

Pérez, Inmaculada Martínez; Valivonis, Juozas; Šalna, Remigijus; Escamilla, Alfonso Cobo

doi:10.3846/13923730.2017.1319413

Cited by 15 publications

(6 citation statements)

References 28 publications

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“…29 Although their flexural load capacities are approximately similar, the deflection of a layered section is reduced when compared with that of a monolithic section. 30 The finite element method (FEM) is regarded as one of the most popular numerical methods for investigation of crack growth and coalescence. 31 Use of a lightweight aggregate fibrous concrete bottom layer with a normal-density concrete topping layer in two-layered beams reduced the beam weight by 42% when compared with a single-layered beam formed using normal-density concrete with similar bending resistance.…”

Section: Introductionmentioning

confidence: 99%

Flexural behavior of two-layer reinforced concrete slab with hollow cores

Eisa,

Aboul-Nour,

El-Ghamry

et al. 2024

Advances in Mechanical Engineering

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Flexural behavior of a concrete slab system with an optimal weight-to-strength ratio comprising layered and hollow-core slab structures was investigated using two-layered slabs with hollow cores (LS/HCS). Six slabs with dimensions of 180, 450, and 1600 mm were tested experimentally and numerically using ANSYS software. Each layered slab comprises a 90-mm-thick lightweight concrete bottom layer and a 90-mm-thick high-strength concrete top layer. Three parameters were studied: core diameter (58, 86, and 110 mm), reinforcement ratio (0.37%, 0.53%, 0.95%), and treatment type (bonding agent, nails). Treatment types were analyzed via push-out testing; both nails and agents connected the slabs with sufficient bond strength. A control slab with 86-mm core diameter, shear-span-to-effective-depth ratio of 4, reinforcement ratio of 0.53%, and agent material was used. Concrete, steel bars, and loading support plates were modeled using SOLID65, LINK180, and SOLID185 elements, respectively. Analytical results were validated experimentally. A parametric study analyzed other parameters affecting LS/HCS behavior, including compressive strength, opening numbers, core shape, applied loading type, added top steel reinforcement, slab type, and slab height. Core diameter reduction, increased reinforcement ratios, and using nails enhanced the failure load. The LS/HCS gives an optimum weight-to-strength ratio with a 33.672% reduction compared with solid slabs.

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Section: Introductionmentioning

confidence: 99%

Flexural behavior of two-layer reinforced concrete slab with hollow cores

Eisa,

Aboul-Nour,

El-Ghamry

et al. 2024

Advances in Mechanical Engineering

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“…Guo Zan [16] established an experimental model for internal cracks in layered steel fiber-reinforced concrete and hybrid steel fiber-reinforced concrete and obtained the relationship curve between load and crack development. Peng O [17] and foreign scholar Inmaculada Martínez-Pérez et al [18] compared the mechanical properties of layered steel fiber-reinforced concrete beams, steel fiber-reinforced concrete beams, and ordinary concrete beams. The study showed that the bending capacity of each beam is basically the same, and the deflection of the LSFRC beam is slightly smaller than that of the solid beam.…”

Section: Introductionmentioning

confidence: 99%

Research on Layered Steel Fiber Reinforced Concrete Mix Ratio Design Based on Orthogonal Test

Wang,

Li,

et al. 2024

Coatings

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The aim of this study was to investigate the effect of different mix ratios on the mechanical properties of steel fiber-reinforced concrete (LSFRC) and to determine an optimum mix ratio. The effects of four factors, namely, fly ash content, volume fraction of steel fibers, water–cement ratio, and sand rate, on the mechanical properties of LSFRC were investigated through orthogonal experiments. The microstructure of LSFRC at different mix ratios was analyzed using scanning electron microscopy (SEM), and an optimal mix ratio was derived. The results showed that the water–cement ratio and the volume fraction of steel fibers were the main factors affecting the mechanical properties of LSFRC. When the water–cement ratio was 0.38 and 0.42, the combined mechanical properties of concrete were superior. Steel fiber content between 0.6% and 1% had a significant effect on the splitting tensile strength of concrete. The effect of sand rate on compressive and splitting tensile strengths was consistent, with a significant effect on both at a sand rate of 40%. In terms of microstructure, 20% fly ash content promotes the hydration of concrete. The optimum LSFRC mix ratio determined was 0.42 water–cement ratio, 0.6% steel fiber content, 40% sand rate, and 20% fly ash content. Experimental verification using this mix ratio showed that the compressive, flexural, and split tensile strengths were increased by 3%, 19%, and 33%, respectively, when compared to ordinary concrete.

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“…When UHPC in the high-stress zone fails under load, UHPC in the low-stress zone does not fully play its role (Ge et al, 2019; Zhang et al, 2014). To make more effective use of UHPC and reduce resource consumption, the wet joint structure of the precast bridge deck needs to be optimized (Cao et al, 2019; Martinez-perez et al, 2017). Therefore, the design concept of a functional gradient structure (Gao and Ma, 2009; Li and Xu, 2009; Wen et al, 2010) was introduced to replace the NC in the negative moment area of the wet joint area with UHPC to form the wet joint structure form of upper-layer NC and lower-layer UHPC.…”

Section: Introductionmentioning

confidence: 99%

Flexural behaviour analysis of wet joint of precast bridge deck with UHPC functional gradient

Wang

Guo

Wang

et al. 2022

Advances in Structural Engineering

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To optimize the wet joint structure of a precast bridge deck and make effective use of ultrahigh-performance concrete (UHPC), five specimens of the prefabricated UHPC functional gradient wet joint plate (UFGWJP) and one normal concrete prefabricated wet joint plate were tested by four-point bending, and their failure modes, bearing capacity, deformation performance, and strain distribution were analysed. The results show that the failure mode of all joint plates was bending failure, and the initial cracking position was basically at the interface between the joint and the precast slab. The excellent mechanical properties of UHPC enhance the bonding performance between the joint and the precast plate interface and significantly improve the cracking load. With an increase in the thickness ratio of UHPC and the flexural toughness ratio of UHPC/normal concrete (NC), the bearing capacity and deformation performance of the joint plate gradually increase. Furthermore, the wet joint of a prefabricated bridge deck with a functional gradient can be designed and fabricated, and the structural optimization of the prefabricated bridge deck wet joints is proven successful by tests.

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Experimental study of flexural behaviour of layered steel fibre reinforced concrete beams

Cited by 15 publications

References 28 publications

Flexural behavior of two-layer reinforced concrete slab with hollow cores

Flexural behavior of two-layer reinforced concrete slab with hollow cores

Research on Layered Steel Fiber Reinforced Concrete Mix Ratio Design Based on Orthogonal Test

Flexural behaviour analysis of wet joint of precast bridge deck with UHPC functional gradient

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