Shear strengthening of hybrid externally-bonded mechanically-fastened concrete beams using short CFRP strips: Experiments and theoretical evaluation

Hadhood, Abdeldayem; Agamy, Mohamed H.; Abdelsalam, Moataz M.; Mohamed, Hamdy M.; Elsayed, Tarek

doi:10.1016/j.engstruct.2019.109795

Cited by 20 publications

(7 citation statements)

References 32 publications

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“…The efficiency of FRP use dramatically affects the mechanical properties of rehabilitation concrete construction [14]. Various cases of strength have been depended on strip length, number and spacing or other standard methods for improving the behaviour of concrete elements [15][16][17][18][19].…”

Section: Research Notementioning

confidence: 99%

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

2022

IJE

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It has become necessary to use damaged tires from various vehicles to produce rubberized concrete structures as a good solution to treat environmental pollution and reduce the total cost of construction. In general, concrete structures, for many reasons, may need to be strengthened. Recently, fiberreinforced polymer (FRP) sheets have been used to reinforce existing concrete structural elements that were deficient. FRP is an effective solution and is moderately common for strengthening and improving the properties of the structural element. Firstly, concrete mixes were poured with replaced sand, with the percentages varying from 0, 10, 20, and 30%. Thus, some mechanical properties in terms of the workability of concrete, compressive strength, tensile strength, and density of recycled concrete were studied using rubber from tires as an alternative to fine aggregate. Secondly, concrete prisms were poured with different proportions of rubber instead of sand. Twelve rubberized concrete prisms measure 100 mm x 100 mm x 600 mm. Then, the effect of fiber reinforced polymer with different forms on concrete prisms was investigated. The results revealed a decrease in the workability, density, and compressive strength of the rubber concrete samples with an increase in the proportions of replaced sand with rubber content. It is also observed that FRP improves the strength, stiffness, and ductility of all concrete prism beams with a different ratio of recycled rubber. In addition, the test results clearly show that the strengthening by width sheets of FPR behaved more favorably than the thin sheets having the same crosssection.

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Section: Research Notementioning

confidence: 99%

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

2022

IJE

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“…So, CFRP has been widely used in the strengthening of reinforced concrete structures. With more and more applications of CFRP systems, its durability is getting more and more attention 24–29 . For reinforced concrete structures exposed to a chloride environment, the internal steel bars in concrete are easy to corrosion due to chloride penetration, resulting in the crack formation of concrete, which further accelerates the penetration of chloride into concrete and reduces the bearing capacity of concrete structures 30,31 .…”

Section: Introductionmentioning

confidence: 99%

Effect of chloride penetration on CFRP sheet, CFRP‐concrete interface, and CFRP‐strengthened concrete beams

Wang

Han

Wang

et al. 2023

Structural Concrete

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Whether the performance of carbon fiber‐reinforced polymer (CFRP)‐strengthened concrete structure is affected by chloride penetration is the key to the application under chloride environments. In this paper, the effect of chloride penetration on tensile properties of CFRP sheet, bond behavior of CFRP‐concrete, and flexural performance of CFRP‐strengthened concrete beams were studied. Results show that chloride penetration has no effect on the elastic modulus of the CFRP sheet. The tensile strength and elongation of the CFRP sheet decrease with the exposure time increase, reducing by 10% and 12.7% after 240 days. The interface failure of CFRP‐concrete is likely to occur on the concrete surface. As the exposure time increases, the interface failure develops toward the epoxy resin layer; the sliding stiffness and end slip of the interface decrease. However, the ultimate bearing capacity of the interface first increases and then decreases. As the exposure time increase, the effective bonding length gradually increases, and the failure mode of CFRP‐strengthened beams changes from bending failure to shear failure. After 120 days, the ultimate bearing capacity of the beams is significantly reduced. From three parts of materials, interfaces, and components to provide an evaluation basis for the use, regular detection, and life prediction of CFRP‐strengthened reinforced concrete beams under chloride environments.

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“…Using the experimental results, the predictive performance of the ACI formulations suggested for the contribution of CFRP systems to the flexural and shear resistance of RC beams was evaluated. Hadhood et al [ 23 ] used the combination of two techniques, externally bonded (EB) and mechanically fastened (MF) CFRP strips with great potential in shear strengthening, aiming to strengthen beams with short CFRP strips using an EB/MF hybrid technique. The use of short CFRP strips resulted in a shear load increase of up to 65 percent over that of the un-strengthened specimen.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Shear Interface Response of Hybrid Thin CFRP–Concrete Slabs

2021

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Hybrid slabs made of carbon-fiber-reinforced polymer (CFRP) and concrete provide a solution that takes advantage of the strength properties of both materials. The performance of the system strongly depends on the CFRP–concrete interaction. This study investigates the shear behavior in the interface of the two materials. Eight full-scale experiments were carried out to characterize the interface shear response of these hybrid elements using different connection solutions. An untreated surface is compared to a surface with aggregates, with a novel system comprising a flexible, straight glass fiber mesh and an inclined glass fiber mesh. The experimental results show that the fabric connection improves the friction between materials and is responsible for the pseudo-plastic performance of the specimens. The inclined mesh produces a more uniform tightening effect compared to the straight mesh. In simulations via the finite element method, we used an adjusted frictional model to reproduce the experiments.

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Shear strengthening of hybrid externally-bonded mechanically-fastened concrete beams using short CFRP strips: Experiments and theoretical evaluation

Cited by 20 publications

References 32 publications

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

Enhancement of the Shear-flexural Strength of the Rubberized Concrete Prism Beam by External Reinforcement

Effect of chloride penetration on CFRP sheet, CFRP‐concrete interface, and CFRP‐strengthened concrete beams

Experimental and Numerical Study of Shear Interface Response of Hybrid Thin CFRP–Concrete Slabs

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