Evaluation of Parameters of Bond Action between FRP and Concrete

Obaidat, Yasmeen Taleb; Heyden, Susanne; Dahlblom, Ola

doi:10.1061/(asce)cc.1943-5614.0000378

Cited by 48 publications

(30 citation statements)

References 16 publications

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“…The Lu et al [34] bond-slip law provided a good prediction of the structural behavior of beams externally strengthened with SRG system. The CNR-DT200R1/2013 [32], Lu et al [34], Monti et al [35] and Obaidat et al [37] bond-slip laws, suitable for FRP systems, did not provide a satisfactory prediction of the structural behavior of the beams externally strengthened with SRP system. To simulate the SRP-concrete interface a modification of the Lu et al [34] bond-slip law was proposed and successfully validated against some experimental data.…”

Section: Discussionmentioning

confidence: 99%

“…For this reason the numerical simulations were carried out taking into consideration bond-slip laws proposed for FRP systems. Several FRP-concrete bond-slip laws are available in literature [32][33][34][35][36][37][38]. In this study the bond-slip laws with a simple bi-linear shape (summarized in Table 2) were considered and analyzed [32,34,35,37].…”

Section: Interface Model and Bond-slip Lawsmentioning

confidence: 99%

“…7(b)), the Monti et al [35] model (FEM2) provided an underestimation of both load carrying capacity and ultimate deflection, whereas the CNR-DT200R1/2013 [32] and Obaidat et al [37] models (FEM1 and FEM4) provided an underestimation of the load carrying capacity and an overestimation of the ultimate deflection, compared to experimental results. For these reasons the numerical results obtained for the beam P1 were not reliable, consequently a modification of the input parameters for the SRP-concrete interface law was required.…”

Section: Strengthened Beams (G1 and P1)mentioning

confidence: 99%

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SRG/SRP–concrete bond–slip laws for externally strengthened RC beams

Bencardino

Condello

2015

Composite Structures

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Section: Discussionmentioning

confidence: 99%

Section: Interface Model and Bond-slip Lawsmentioning

confidence: 99%

Section: Strengthened Beams (G1 and P1)mentioning

confidence: 99%

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SRG/SRP–concrete bond–slip laws for externally strengthened RC beams

Bencardino

Condello

2015

Composite Structures

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“…However, appropriate bond-slip laws capable to predict the structural behavior of strengthened RC elements are not yet available in the literature for inorganic based strengthening systems. Nevertheless, the reliability and adaptability of some bond-slip laws [33][34][35][36] proposed for the FRP systems to predict the behavior of RC beams externally simple plated with SRG and SRP systems was recently analyzed by Bencardino and Condello [23]. The study concludes that among a set of bi-linear FRP-concrete bond-slip laws, the Lu et al [35] bond-slip model was also suitable to simulate the behavior of a SRG-concrete interface.…”

Section: Interface Model and Bond-slip Lawsmentioning

confidence: 99%

“…They were assigned to both sliding I and sliding II fracture modes. With reference to the mode I, for both the SRG-concrete and SRP-concrete interfaces, the maximum stress σ max was set to the concrete tensile strength (3.5 MPa) and the fracture energy was assumed to be 10% of G f [33]. Further details regarding the relationships used to calculate and calibrate the interface parameters are given in [23].…”

Section: Interface Model and Bond-slip Lawsmentioning

confidence: 99%

3D FE Analysis of RC Beams Externally Strengthened with SRG/SRP Systems

Bencardino

Condello

2016

Fibers

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Abstract:The purpose of this study is to evaluate, through a nonlinear Finite Element (FE) analysis, the structural behavior of Reinforced Concrete (RC) beams externally strengthened by using Steel Reinforced Grout (SRG) and Steel Reinforced Polymer (SRP) systems. The parameters taken into account were the external strengthening configuration, with or without U-wrap end anchorages, as well as the strengthening materials. The numerical simulations were carried out by using a three-dimensional (3D) FE model. The linear and nonlinear behavior of all materials was modeled by appropriate constitutive laws and the connection between concrete substrate and external reinforcing layer was simulated by means of cohesive surfaces with appropriate bond-slip laws. In order to overcome convergence difficulties, to simulate the quasi-static response of the strengthened RC beams, a dynamic approach was adopted. The numerical results in terms of load-displacement curves, failure modes, and load and strain values at critical stages were validated against some experimental data. As a result, the proposed 3D FE model can be used to predict the structural behavior up to ultimate stage of similar strengthened beams without carrying out experimental tests.

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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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Evaluation of Parameters of Bond Action between FRP and Concrete

Cited by 48 publications

References 16 publications

SRG/SRP–concrete bond–slip laws for externally strengthened RC beams

SRG/SRP–concrete bond–slip laws for externally strengthened RC beams

3D FE Analysis of RC Beams Externally Strengthened with SRG/SRP Systems

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

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