Tests investigating the punching shear of a column-slab connection strengthened with non-prestressed or prestressed FRP plates

Abdullah, Ahmad; Bailey, Colin; Wu, Jack

doi:10.1016/j.conbuildmat.2013.07.012

Cited by 45 publications

(24 citation statements)

References 7 publications

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“…Fig. 6 presents the experimental and computed load-rotation relationships for the tests by Abdullah et al [12], where good agreement between the theory and the actual behaviour can be observed. The highest increase on the punching strength due to the FRP strengthening was obtained by Abdullah et al [12].…”

Section: Analysis Of Test Data Using the Csctmentioning

confidence: 94%

“…Abdullah et al [12] tested four slabs measuring 1800 Â 1800 Â 150 mm together with a reference specimen used for comparisons. One of the specimens was strengthened with nonprestressed CFRP laminates, whereas the other three had prestressed laminates.…”

Section: Description Of the Selected Test Datamentioning

confidence: 99%

“…In the following, test results on symmetrical isolated slab specimens that reported all necessary mechanical and geometrical properties to be compared to the previous mechanical model and with an effective depth d s larger than 80 mm (to account for realistic dimensions in practice) were selected [1,8,12]. Some other works [2-7,9-11] were not considered as there was no information on the maximum aggregate size or the slabs were relatively thin.…”

Section: Description Of the Selected Test Datamentioning

confidence: 99%

“…Fibre Reinforcement Polymers (FRP) can be used as a technique to strengthen existing two way flat slabs against punching shear failures developing at slab-column connections [1][2][3][4][5][6][7][8][9][10][11][12]. For this purpose, FRP strips are usually glued on the top surface of the slab (Fig.…”

Section: Introductionmentioning

confidence: 99%

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On the efficiency of flat slabs strengthening against punching using externally bonded fibre reinforced polymers

Faria

Einpaul

Ramos

et al. 2014

Construction and Building Materials

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Type of publication:Peer reviewed journal article FRP's can be effectively used to strengthen existing flat slabs against punching shear. The CSCT can be applied to predict the punching strength of strengthened slabs using FRP's. The strengthening efficiency is more pronounced in slabs with lower reinforcement ratio and larger column sizes. The strengthening efficiency is less pronounced in actual continuous flat slabs. a r t i c l e i n f o b s t r a c tOne possibility for strengthening existing flat slabs consists on gluing fibre reinforced polymers (FRPs) at the concrete surface. When applied on top of slab-column connections, this technique allows increasing the flexural stiffness and strength of the slab as well as its punching strength. Nevertheless, the higher punching strength is associated to a reduction on the deformation capacity of the slab-column connection, which can be detrimental for the overall behaviour of the structure (leading to a more brittle behaviour of the system). Design approaches for this strengthening technique are usually based on empirical formulas calibrated on the basis of the tests performed on isolated test specimens. However, some significant topics as the reduction on the deformation capacity or the influence of the whole slab (accounting for the reinforcement at mid-span) on the efficiency of the strengthening are neglected. In this paper, a critical review of this technique for strengthening against punching shear is investigated on the basis of the physical model proposed by the Critical Shear Crack Theory (CSCT). This approach allows taking into account the amount, layout and mechanical behaviour of the bonded FRP's in a consistent manner to estimate the punching strength and deformation capacity of strengthened slabs. The approach is first used to predict the punching strength of available test data, showing a good agreement. Then, it is applied in order to investigate strengthened continuous slabs, considering moment redistribution after concrete cracking and reinforcement yielding. This latter study provides valuable information regarding the differences between the behaviour of isolated test specimens and real strengthened flat slabs. The results show that empirical formulas calibrated on isolated specimens may overestimate the actual performance of FRP's strengthening. Finally, taking advantage of the physical model of the CSCT, the effect of the construction sequence on the punching shear strength is also evaluated, revealing the role of this issue which is also neglected in most empirical approaches.

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Section: Analysis Of Test Data Using the Csctmentioning

confidence: 94%

Section: Description Of the Selected Test Datamentioning

confidence: 99%

Section: Description Of the Selected Test Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the efficiency of flat slabs strengthening against punching using externally bonded fibre reinforced polymers

Faria

Einpaul

Ramos

et al. 2014

Construction and Building Materials

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show abstract

“…At slab-column connections damaged by flexural cracking, it was assumed that the punching shear force was resisted mainly by the compression zone of the critical section. Abdullah et al [4] investigated the effectiveness of bonding non-prestressed and prestressed carbon fiber reinforced polymer plates to the tension surface of concrete column-slab connections in both the serviceability and ultimate limit state. However, the punching shear capacity calculation methods of several national building codes are different, the punching failure mechanism is still not clear yet.…”

Section: Introductionmentioning

confidence: 99%

Punching Shear Capacity Analysis of Reinforced Concrete Slab-column Connections

Guo¹,

Cheng²

2015

Proceedings of the 2015 International Conference on Advanced Engineering Materials and Technology

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Abstract. In order to solve punching shear strength problem of reinforced concrete slab-column connections, an improved punching shear capacity formula is presented. First, punching shear capacity of reinforced concrete slab-column connections is analyzed. Then, a comparison of punching shear capacity calculation methods is studied based on the codes: GB50010-2010, ACI318-08 and EN1992-1-1-2004. The effect of longitudinal reinforcement ratio is analyzed by using ANSYS finite element software. Finally, an improved punching shear capacity formula is proposed. The results indicate that because of the consideration of longitudinal reinforcement ratio, the calculation capacity of the improved punching shear capacity formula is more reasonable.

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Concrete screws as a post‐installed punching shear reinforcement

Walkner

Spiegl

Feix

2020

Structural Concrete

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The strengthening of concrete structures is becoming more and more important. To achieve this need for strengthening measures, technically innovative, simple and economical systems for subsequent strengthening are required. At the University of Innsbruck, a system for subsequent strengthening of the punching shear zone through the installation of concrete screws has been developed. These screws are installed from the soffit side of the slab in vertically predrilled holes and are arranged concentrically around the support. This paper discusses the results of four test series, with a total of 21 specimens used to develop the system. The system, which can be very easily installed, demonstrates a significant increase of the shear punching capacity and a reduction in brittle failure modes. In addition, cyclic loading with typical levels of service load has no negative effect on the effectiveness of the system. Finally, the influence of the flexural reinforcement ratio on the effectiveness of the strengthening system was investigated.

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Tests investigating the punching shear of a column-slab connection strengthened with non-prestressed or prestressed FRP plates

Cited by 45 publications

References 7 publications

On the efficiency of flat slabs strengthening against punching using externally bonded fibre reinforced polymers

On the efficiency of flat slabs strengthening against punching using externally bonded fibre reinforced polymers

Punching Shear Capacity Analysis of Reinforced Concrete Slab-column Connections

Concrete screws as a post‐installed punching shear reinforcement

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