Punching Shear Resistance of Steel Fiber Reinforced Concrete Flat Slabs

Nguyen-Minh, Long; Rovňák, Marián; Tran-Quoc, T.; Nguyenkim, K.

doi:10.1016/j.proeng.2011.07.230

Cited by 51 publications

(27 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For a more reliable j À (V/V flex ) relationship, the results obtained from the experimental works carried bout by Nguyen-Minh et al [9], Cheng and Parra [25], Azevedo [24] and Holanda [27] were also considered, leading to a direct proportionality between j and…”

Section: Load-rotation Approachmentioning

confidence: 99%

Assessment of the effectiveness of steel fibre reinforcement for the punching resistance of flat slabs by experimental research and design approach

Barros

Neto

Melo

et al. 2015

Composites Part B: Engineering

View full text Add to dashboard Cite

a b s t r a c tThe present paper deals with the experimental assessment of the effectiveness of steel fibre reinforcement in terms of punching resistance of centrically loaded flat slabs, and to the development of an analytical model capable of predicting the punching behaviour of this type of structures. For this purpose, eight slabs of 2550 Â 2550 Â 150 mm 3 dimensions were tested up to failure, by investigating the influence of the content of steel fibres (0, 60, 75 and 90 kg/m 3 ) and concrete strength class (50 and 70 MPa). Two reference slabs without fibre reinforcement, one for each concrete strength class, and one slab for each fibre content and each strength class compose the experimental program. All slabs were flexurally reinforced with a grid of ribbed steel bars in a percentage to assure punching failure mode for the reference slabs. Hooked ends steel fibres provided the unique shear reinforcement. The results have revealed that steel fibres are very effective in converting brittle punching failure into ductile flexural failure, by increasing both the ultimate load and deflection, as long as adequate fibre reinforcement is assured. An analytical model was developed based on the most recent concepts proposed by the fib Mode Code 2010 for predicting the punching resistance of flat slabs and for the characterization of the behaviour of fibre reinforced concrete. The most refined version of this model was capable of predicting the punching resistance of the tested slabs with excellent accuracy and coefficient of variation of about 5%.

show abstract

Section: Load-rotation Approachmentioning

confidence: 99%

Assessment of the effectiveness of steel fibre reinforcement for the punching resistance of flat slabs by experimental research and design approach

Barros

Neto

Melo

et al. 2015

Composites Part B: Engineering

View full text Add to dashboard Cite

show abstract

“…Whereas for the SFWS(P) sample, the cracks occurred on the bottom surface was more intact with smaller width. This is due to the bridging effect of the steel fibres that significantly improve the ductility and the integrity of the slab-column connection [26]. …”

Section: First Crack and Ultimate Loadmentioning

confidence: 99%

Flexural behaviour and punching shear of selfcompacting concrete ribbed slab reinforced with steel fibres

et al. 2017

View full text Add to dashboard Cite

Abstract. This paper investigates the effects of steel fibres as a replacement to the conventional reinforcement under flexural behaviour and punching shear in self-compacting (SCC) ribbed slab reinforced with steel fibres. Four ribbed slabs with similar dimensions of 2.8 m length x 1.2 m width and 0.2m thickness were constructed. Two of the samples were considered as control samples (conventionally reinforced with reinforcement bars and welded mesh) while another two samples were fully reinforced with 1% (80 kg/m 3 ) volume of steel fibres incorporated to the SCC mix. For the flexural behaviour study, the ribbed slab samples were subjected to two line loads under four point bending. Meanwhile, for the punching shear analysis, the ribbed slab samples were subjected to a point load to simulate loading from the column. The analysis of the experimental results displayed that steel fibres incorporation had been found to effectively delay the first crack occurrence under both flexural and punching shear. The steel fibre replacement has been proven to be able to sustain up to 80% and 73% of the ultimate load resistance for flexural and punching shear, respectively, in comparison to conventionally reinforced ribbed slab structure. The visual observation carried out during the experiment exhibited similar failure mode for both steel fibre reinforced and control samples. This was observed for both flexural and punching shear samples. Overall, it can be concluded that the steel fibres had displayed a promising potential to effectively replace the conventional reinforcements.

show abstract

“…Based on the force equilibrium condition at the cross section, the neutral axis depth at the ultimate state (c u ) can be simply estimated as follows Table 2 shows the material and dimensional properties of the SFRC flat plate slab specimens collected from previous studies. 1,[11][12][13][14]16,[27][28][29][30][31] To verify the applicability of equation (10), which was derived from the assumption of yielding of longitudinal reinforcement, the normalized strains (e s, cal =e sy ) were plotted in Figure 5 with respect to the compressive strength of concrete and longitudinal reinforcement ratio. In order to get this graph, the neutral axis depths of all collected specimens were calculated using equation (10), and the strain in tension reinforcement (e s, cal ) was estimated at the extreme compression fiber when the compressive strain is 20.002.…”

Section: Shear Contribution Of the Uncracked Compression Zonementioning

confidence: 99%

“…[23][24][25][26] The proposed model is also verified by comparing with the test results of SFRC slab-column connections collected from the literature. 1,[11][12][13][14]16,[27][28][29][30][31] In addition, the relation between the shear contribution of the undamaged concrete in the compression zone and that of the steel fibers in the tensile zone is also discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

Consideration on punching shear strength of steel-fiber-reinforced concrete slabs

Cheon

Lee

et al. 2015

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The flat plate slab system is widely used in construction fields due to its excellent constructability and savings in story height compared to the conventional beam-column moment-resisting system. Many researchers are, however, concerned about the punching shear failure that can happen in a two-way flat plate slab system, for which many shear-strength-enhancement techniques have been suggested. One of the effective alternatives is the application of steelfiber-reinforced concrete. However, most previous studies on the punching shear strength of steel-fiber-reinforced concrete flat slabs had presented empirical formulas based on experimental results. On the other hand, theoretical models proposed in previous studies are difficult to be applied to practical situations. Therefore, in this study, a punching shear strength model of the steel-fiber-reinforced concrete two-way flat slab is proposed. In this model, the total shear resistance of the steel-fiber-reinforced concrete flat slab is expressed by sum of the shear contribution of steel fibers in the cracked tension region and that of intact concrete in the compression zone. A total of 91 shear test data on steel-fiberreinforced concrete slab-column connection were compared to the analysis results, and the proposed model provided a good accuracy on estimating the punching shear strength of the steel-fiber-reinforced concrete flat slabs.

show abstract

Punching Shear Resistance of Steel Fiber Reinforced Concrete Flat Slabs

Cited by 51 publications

References 2 publications

Assessment of the effectiveness of steel fibre reinforcement for the punching resistance of flat slabs by experimental research and design approach

Assessment of the effectiveness of steel fibre reinforcement for the punching resistance of flat slabs by experimental research and design approach

Flexural behaviour and punching shear of selfcompacting concrete ribbed slab reinforced with steel fibres

Consideration on punching shear strength of steel-fiber-reinforced concrete slabs

Contact Info

Product

Resources

About