A modified fiber-reinforced plastics concrete interface bond-slip law for shear-strengthened RC elements under cyclic loading

Selman, Efe; Alver, Ninel

doi:10.1002/pc.23535

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…The mean values of the load were determined according to the design values and the experimental values of G f . The design values were calculated by several common models proposed in the literature [ 10 , 16 , 18 , 19 , 20 ]. The range of calculated values of G f was 0.38 N/mm–1.10 N/mm.…”

Section: Effects Of Load Distribution On Reliability Of mentioning

confidence: 99%

“…The performance of this method depends on adequate bond strength between the FRP and the concrete, which ensures the stress transmission between and coordination of FRP and concrete [ 3 ]. Therefore, numerous studies have been conducted on the bond mechanism of the FRP-to-concrete interface, including experimental studies [ 4 , 5 , 6 , 7 ], theoretical analysis [ 8 , 9 , 10 , 11 ], and finite-element simulations [ 12 , 13 ]. The vast majority of these studies have used fracture energy, G f , as an indicator for evaluating the FRP–concrete interfacial bond strength.…”

Section: Introductionmentioning

confidence: 99%

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Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Liang

et al. 2018

Materials

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Effective bonding between adherents plays a key role in retrofitting concrete structures in civil engineering using fibre-reinforced polymers (FRPs). To ensure structural safety, it is critical to develop design codes, which account for uncertainties of materials, the environment, and load, to estimate bond behaviour under long-term exposure to harsh environments. Therefore, a reliability analysis was performed to study the bond behaviour of FRP–concrete interface under wet–dry cycles and sustained loading. Thirty double-lap, shear-bonded carbon FRP (CFRP)–concrete composite specimens were tested after wet–dry cycles and sustained loading exposure. The fracture energy Gf of the bond behavior between CFRP and concrete was directly obtained from the measured local bond-slip curves. Five widely used test methods were adopted to verify the possible distribution types of Gf. Based on the best fit distribution of Gf, a reliability index β was then calculated for the specimens. The effects of wet–dry exposure and sustained loading on β were analysed separately. The effects of the mean and standard deviation of the load on β were compared. It was found that the mean had a greater impact on reliability than the standard deviation, but neither changed the regulation of the exponential reduction of β with increasing wet–dry cycle time. Their impact was significant for a small number of wet–dry cycles but insignificant for more than 4000 wet–dry cycles.

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Section: Effects Of Load Distribution On Reliability Of mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Liang

et al. 2018

Materials

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“…Accurate prediction of crack propagation in composite material is important to improve structural reliability, integrity, durability, and serviceability (Anyfantis & Berggreen, 2014;Beaumont & Soutis, 2016). Furthermore, the effect strengthened in shear by CFRP on crack propagation in the sub-concrete material (Figure 1) is essential (Selman & Alver, 2015;Bruno, Greco, & Feudo, 2017).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of shear-strengthening of reinforced concrete beams by CFRP under cyclic loading

Shahbazpanahi

Ali

2019

rdlc

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A novel finite element model is proposed to simulate reinforced concrete (RC) beams strengthened in shear by carbon fibre-reinforced polymer (CFRP) plate under cyclic loading. A spring element is developed to simulate the fracture zone based on the virtual crack in the sub-concrete material. The mass and damping matrix of the spring element is defined to model crack propagation in the sub-concrete material on nonlinear fracture mechanics under cyclic loading. A new energy release rates is computed to compare to the critical energy release rate of the sub-concrete material. A bar element is set parallel to the spring element to model the effect of the CFRP strengthened in shear and to calculate the energy dissipation rate by the CFRP based on virtual crack. The mass and damping matrix of the bar element is defined as well. When the finite element model is performed, the energy release rates can be computed simultaneously. Crack propagation can be studied with the implementation of new fracture criterion. The results of the proposed model are compared with the conventional fracture models carried out by commercial ABAQUS software based on linear elastic fracture mechanics and the previous experimental tests data. The results from the proposed model are in reasonable agreement with the results of previous experimental test.

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“…Effective bond action is a basis of stress transfer between FRP and concrete, thus ensuring that concrete and FRP work together. Consequently, the bond mechanism of the FRP‐to‐concrete interface has been extensively studied by experimental studies , theoretical analysis , and finite‐element simulation in over past two decades. However, most of these studies focused on short‐term performance of CFRP–concrete interface, and information on long‐term behavior of the composite structures is scarce, especial servicing in multiple harsh environments exposure (e.g., marine environment, acid rain erosion, high temperature, and sustained load coupling) .…”

Section: Introductionmentioning

confidence: 99%

The combined effects of wet–dry cycles and sustained load on the bond behavior of FRP–concrete interface

Liang

et al. 2018

Polymer Composites

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Effective bonding between the adherents plays a key point when dealing with the retrofit of concrete structures by using fiber-reinforced polymers (FRPs). However, lack of adequate studies on the long-term performance of the bond behavior of FRP-concrete interface under harsh environments will inhibit their application in the repair of aged structures. Therefore in this study, 60 double-lap shear-bonded FRPconcrete composite specimens were designed and tested under wet-dry cycles and sustained loading. The effect of FRP type (GFRP and CFRP), wet-dry cycling times (0-360 days) and sustained loading level (0-60% of the ultimate load of the control specimen) on the failure modes, stress transfer, and local bondslip curves of the composite specimens were investigated. The experimental results showed that wet-dry cycling exposure changed the failure mode of the composite specimens from the concrete substrate to the adhesive-concrete interface, further extended the local debonding area and decreased the ultimate strains of composite specimens from 12,000 to 8,000 lE. The degree of the degradation will be further increased under the combined effect of sustained loading and wet-dry exposure. The effects of FRP type, wet-dry cycling times and sustained loading level on the fracture energy of the specimens were quantitatively analyzed. A regression model was then proposed that was able to predict the fracture energy after environment exposure with reasonable accuracy, which can provide a reference for the design of bond durability factors in relevant specifications, such as ACI 440R-08 POLYM. COMPOS., 00:000-000,

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A modified fiber-reinforced plastics concrete interface bond-slip law for shear-strengthened RC elements under cyclic loading

Cited by 4 publications

References 27 publications

Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Numerical simulation of shear-strengthening of reinforced concrete beams by CFRP under cyclic loading

The combined effects of wet–dry cycles and sustained load on the bond behavior of FRP–concrete interface

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