Local Bond-Slip Relationship for FRP Reinforcement in Concrete

Focacci, Francesco; Nanni, Antonio; Bakis, Charles E.

doi:10.1061/(asce)1090-0268(2000)4:1(24)

Cited by 172 publications

(101 citation statements)

References 7 publications

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“…This expression may be established in terms of forces [34,35] or, as is the case of this paper, may be derived in terms of slip [19,36]. In the following lines, a brief overview of the analytical formulation used in this paper is presented, being possible to find more details elsewhere [19,37].…”

Section: Local Bond Slip and Pullout Load-slip Relationshipmentioning

confidence: 99%

Effect of wet-dry cycles on the bond behaviour of concrete elements strengthened with NSM CFRP laminate strips

Garzón-Roca

Sena-Cruz

Fernandes

et al. 2015

Composite Structures

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ElsevierGarzón-Roca, J.; Sena-Cruz, JM.; Fernandes, P.; Xavier, J. (2015). Effect of wet-dry cycles on the bond behavior of concrete elements strengthened with NSM CFRP laminate strips. Composite Structures. 132:331-340. doi:10.1016Structures. 132:331-340. doi:10. /j.compstruct.2015 AbstractThe near-surface mounted (NSM) strengthening technique is capable of effectively increase the bearing capacity of structural concrete elements. This technique which basically consists of placing FRP reinforcements inside small grooves cut in the concrete cover, has been widely investigated in terms of structural performance and ability to improve the flexural and shear behaviour of reinforced concrete beams and columns. However, little research has been carried out concerning to the NSM long-term performance and durability. Motivated by the need of increasing the knowledge on the expected durability of the NSM technique using CFRP laminates, this paper presents an experimental program in which direct pull-out tests are carried out for evaluating the bond behaviour of specimens aged through wet-dry cycles. A total of 30 specimens are tested, analysing the effect of the bond length, the groove width, the groove depth and the aging effect on the bond behaviour. Digital image correlation method is also used to identify the bond resistant mechanism developed in an element strengthened using NSM technique. Finally, using the experimental results, an analytical-numerical strategy is applied to establish the local bond stress-slip relationship.

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Section: Local Bond Slip and Pullout Load-slip Relationshipmentioning

confidence: 99%

Effect of wet-dry cycles on the bond behaviour of concrete elements strengthened with NSM CFRP laminate strips

Garzón-Roca

Sena-Cruz

Fernandes

et al. 2015

Composite Structures

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“…In such a way, the weak tensile strength of concrete is assisted by the high tensile strength of the bar. There are many studies carried out on the bond properties of GFRP bars with the normal OPC as well as with GPC concretes [5][6][7][8][9][10][11]. However, with the exception of some recent works [12,13], not much has been done on the bond properties of GFRP reinforced GPC concrete.…”

Section: Introductionmentioning

confidence: 99%

Bond behaviour of GFRP reinforced geopolymer cement concrete

2017

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Abstract. Bond plays a key role in the performance of reinforced concrete structures. Glass fibre reinforced polymer (GFRP) reinforcing bar and Geopolymer cement (GPC) concrete are promising alternative construction materials for steel bars and Ordinary Portland Cement (OPC) concrete respectively. In this study, the bond behaviour between these two materials is investigated by using beam-end specimen tests. The bond behaviour of 15.9 mm diameter sand-coated GFRP bar was investigated. An embedment length of six and nine times the bar diameter were used. The free end and the loaded end bond-slip-relationships, the bond failure mode and the average bond stress were used to analyse each of the specimens. Additionally, the distribution of tensile and bond stress along the embedment length was investigated by installing strain gauges along the embedment length in some of the specimens. Test results indicate that a significant difference exists between the free end and loaded end bond-slip curves, which is due to the lower elastic modulus of the GFRP bars. Furthermore, it was found that the tensile and bond stress distribution along the embedment length is nonlinear and the nonlinearity changes with the load.

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“…Various projects of research have already been proposed in order to quantify and characterize the mechanism of bond forces development around the deformed steel bar. To improve the accuracy of the reinforced concrete structures responses, formulations are based on theoretical investigations, and the effect of bond is implemented in the numerical analysis (Eligehausen et al 1983;Cosenza et al 1997;Focacci et al 2000;Campione et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Tension Stiffening Bond Modelling of Cracked Flexural Reinforced Concrete Beams/Supleišėjusių Gelžbetoninių Sijų Armatūros Ir Betono Sankibos Modeliavimas

Khalfallah

2008

Journal of Civil Engineering and Management

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Abstract. This paper deals with the analysis of cracked flexural reinforced concrete structures with special highlighting of modelling the interaction between concrete and reinforcement. A new approach based on the bond stress distribution through the transfer length between the zero-slip and the cracked sections is proposed. Since the cracking phenomenon of concrete occurs, the fracture energy changes in order to appeal to the interaction between concrete and steel. The increment of stresses is evaluated by the bond-slip distribution by means of one-dimensional problem. Besides, the 2D nonlinear description of components behaviour, concrete and steel are considered. On numerical modelling level, the interaction property is obtained from a variety of fundamental pull out and push out tests, for the most part this phenomenon does not very well represent the bending members. For this object, this study presents a numerical approach, which can compute the distribution stresses at the steel-concrete interface near flexural crack in reinforced concrete beams. Finally, predictions made by the non-linear finite element analysis program and the non-linear material models for concrete, reinforcing bars and bond slip are in good agreement with the experimental results.

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Local Bond-Slip Relationship for FRP Reinforcement in Concrete

Cited by 172 publications

References 7 publications

Effect of wet-dry cycles on the bond behaviour of concrete elements strengthened with NSM CFRP laminate strips

Effect of wet-dry cycles on the bond behaviour of concrete elements strengthened with NSM CFRP laminate strips

Bond behaviour of GFRP reinforced geopolymer cement concrete

Tension Stiffening Bond Modelling of Cracked Flexural Reinforced Concrete Beams/Supleišėjusių Gelžbetoninių Sijų Armatūros Ir Betono Sankibos Modeliavimas

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