Modeling of RC shear walls strengthened by FRP composites

Sakr, Mohammed A.; El-khoriby, Saher R.; Khalifa, Tarek M.; Nagib, Mohammed T.

doi:10.12989/sem.2017.61.3.407

Cited by 16 publications

(10 citation statements)

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“…Figure shows a graphic interpretation of a simple bilinear traction‐separation law written in terms of the effective tractions and effective opening displacement. The interface thickness is considered negligibly small, and the initial stiffness Kss , Ktt , and Knn in the two shear and the normal directions, respectively, for the first cohesive surface defined in References :…”

Section: Fe Analysismentioning

confidence: 99%

Finite element modeling of debonding mechanisms in carbon fiber reinforced polymer‐strengthened reinforced concrete continuous beams

Sakr

2017

Structural Concrete

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This paper presents three‐dimensional (3D) and two‐dimensional (2D) finite element models to analyze strengthened reinforced concrete (RC) continuous beams with carbon fiber reinforced polymer (CFRP) which has become familiar technique in the last decade. Experimental results in the literature showed that two different debonding failure modes, either by interfacial debonding of fiber reinforced polymer (FRP) or by concrete cover separation may occur. This study takes the two possible debonding failure modes into account by considering two cohesive surfaces; the first is inserted in the adhesive layer, whereas the second is inserted between the reinforcing steel and the concrete cover. The proposed cohesive surfaces take the slippage into account considering the cohesive surface fracture energy. The numerical models are verified utilizing five symmetrical RC continuous beams available in the literature. The numerical results of 3D and 2D models for the plated beams (beams strengthened with FRP plates) agreed well with the experimental results. Additionally, the effect of the CFRP plate length, and the parameters of the cohesive surfaces on the behavior and debonding failure modes (in the adhesive layer and between the reinforcing steel and the concrete cover) of CFRP‐strengthened RC continuous beams are investigated.

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Section: Fe Analysismentioning

confidence: 99%

Finite element modeling of debonding mechanisms in carbon fiber reinforced polymer‐strengthened reinforced concrete continuous beams

Sakr

2017

Structural Concrete

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“…Studies have also revealed that hybrid application of U-shaped FRP-bonded sheets with a metal anchor is an appropriate technique to avoid premature debonding [107,108]. [109]; (e) modified from Elnady [110]; (f) modified from Layssi et al [111]; (g-j) modified from Aslani et al [112]; (k) modified from Arabzadeh et al [113].…”

Section: Shear Wallsmentioning

confidence: 99%

“…Sakr et al [109] showed that configuration (c) in the walls governed by shear failure has the most satisfactory performance in order to increase ductility and lateral strength. Nevertheless, pattern (b) has the best performance for shear walls governed by flexural failure.…”

Section: Shear Wallsmentioning

confidence: 99%

“…Aslani [112] revealed that configurations (g, h, i, and j) could increase energy dissipation and bearing capacity and decrease residual displacement of shear walls. They also showed that configurations (g, h) are more effective in shear walls with central openings, but pattern (g) cannot be Sakr et al [109] showed that configuration (c) in the walls governed by shear failure has the most satisfactory performance in order to increase ductility and lateral strength. Nevertheless, pattern (b) has the best performance for shear walls governed by flexural failure.…”

Section: Shear Wallsmentioning

confidence: 99%

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Enhancing Resilience and Self-Centering of Existing RC Coupled and Single Shear Walls Using EB-FRP: State-of-the-Art Review and Research Needs

Abbaszadeh

Chaallal

2022

J. Compos. Sci.

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The primary seismic force-resisting system (SFRS) in middle- to high-rise reinforced concrete (RC) building structures often includes coupled shear walls (CSWs) and single shear walls (SSWs). These walls are designed to transfer lateral forces to the foundation and dissipate energy through the development of plastic hinges. The latter lead to residual displacement in these structural components. On the other hand, self-centering systems enable the structures to return to their initial position after severe loading or at least reduce residual displacement. The objectives of this study were, therefore, as follows: (i) to review the state of the art on shear wall self-centering techniques and retrofitting methods based on externally bonded fiber-reinforced polymer (EB-FRP); (ii) to evaluate research needs to improve the self-centering ability of shear walls using EB-FRP.

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“…To date, various experimental and analytical studies have been conducted on concrete reinforced with FRPs [8][9][10][11][12][13][14][15][16][17][18]. In particular, concrete bridges and building structures are commonly reinforced by attaching carbon fiber-reinforced plastic (CFRP) strips to the surface of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Effect of slitting of carbon fiber-reinforced plastic strip on flexural properties of reinforced concrete

Kwon

Chae

Kwon

et al. 2022

Mater. Res. Express

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In this study, reinforced concrete was manufactured by attaching a carbon fiber reinforced plastic (CFRP) strips to the surface of the concrete. Strips with the same total area were slitted into one, two, three, four, and six pieces and attached to the upper, lower, and side parts of the concrete. The flexural strength and fracture toughness of the reinforced concrete were investigated. As the number of slits in the strip increased, for the upper reinforcement, the flexural strength gradually increased from 7.88 MPa to 11.21 MPa; for the lower reinforcement, the flexural strength increased significantly from 7.88 MPa to 26.48 MPa and then gradually increased to 33.90 MPa; and for the side reinforcement, the flexural strength increased from 7.12 MPa to 13.96 MPa and then gradually decreased. In the adhesive fracture toughness test, the fracture toughness energy significantly increased from 142.38 J m-2 to 516.63 J m-2 as the contact area between the adhesive and the strip increased. Therefore, in reinforcing concrete using a CFRP strip, it was confirmed that the reinforcement effect was enhanced when the strip was slit and then attached.

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Modeling of RC shear walls strengthened by FRP composites

Cited by 16 publications

References 0 publications

Finite element modeling of debonding mechanisms in carbon fiber reinforced polymer‐strengthened reinforced concrete continuous beams

Finite element modeling of debonding mechanisms in carbon fiber reinforced polymer‐strengthened reinforced concrete continuous beams

Enhancing Resilience and Self-Centering of Existing RC Coupled and Single Shear Walls Using EB-FRP: State-of-the-Art Review and Research Needs

Effect of slitting of carbon fiber-reinforced plastic strip on flexural properties of reinforced concrete

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