Full-range FRP failure behaviour in RC beams shear-strengthened with FRP wraps

Chen, G.M.; Li, S.W.; Fernando, Dilum; Liu, P.C.; Chen, J.F.

doi:10.1016/j.ijsolstr.2017.07.019

Cited by 42 publications

(8 citation statements)

References 39 publications

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“…Because of the high tensile strength, light weight, and convenient construction, BF/EP composite material can be used as a new type of reinforcement material and applied to repair and strengthening of concrete structure and steel structure in civil engineering [7]. For example, the reinforcement material is glued to the tensile area of concrete component (walls, beams, slabs, and columns), which can effectively improve its carrying capacity, avoid excessive deformation of the cross section, and prevent the crack expansion [8][9][10]. And in the shear area of the concrete beam, reinforced material can effectively improve its shearing capacity [11,12].…”

Section: Introductionmentioning

confidence: 99%

Tensile Mechanical Properties and Failure Modes of a Basalt Fiber/Epoxy Resin Composite Material

Shi

Cao

et al. 2018

Advances in Civil Engineering

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Uniaxial tensile tests of basalt fiber/epoxy (BF/EP) composite material with four different fiber orientations were conducted under four different fiber volume fractions, and the variations of BF/EP composite material failure modes and tensile mechanical properties were analyzed. The results show that when the fiber volume fraction is constant, the tensile strength, elastic modulus, and limiting strain of BF/EP composite material all decrease with increasing fiber orientation angle. When the fiber orientation angle is constant, the tensile strength, elastic modulus, and limiting strain of BF/EP composite material all increase with increasing fiber volume fraction. A certain degree of fiber clustering appears in the epoxy resin when the basalt fiber volume fraction is >1.2%. The fiber equidistribution coefficient and clustering fiber content were used to characterize the basalt fiber clustering effect. With the increase of fiber volume fraction, the clustering fiber content gradually increased, but the fiber equidistribution coefficient decreased. Meanwhile, based on Tsai theory, a geometric model and a tensile mechanical model of the clustering fiber are established. By considering the fiber clustering effect, the BF/EP composite material tensile strength is calculated, and the calculated values are close to the experimental results.

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Section: Introductionmentioning

confidence: 99%

Tensile Mechanical Properties and Failure Modes of a Basalt Fiber/Epoxy Resin Composite Material

Shi

Cao

et al. 2018

Advances in Civil Engineering

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“…Mostafa et al predicted the debonding load for FRP strengthened reinforced concrete members and proposed a nonlinear analytical model to determine the interfacial shear and normal stresses at the FRP–concrete interface for reinforced concrete beams externally strengthened with CFRP sheets [32,33]. Chen et al [34] presented an analytical study on the progressive failure of FRP wraps in strengthened beams. In their research study, the debonding and the subsequent rupture processes were derived, and the FRP contribution to the shear capacity of the beam was quantified.…”

Section: Literature Reviewmentioning

confidence: 99%

Flexural and Shear Strain Characteristics of Carbon Fiber Reinforced Polymer Composite Adhered to a Concrete Surface

Qureshi

Saleem

2018

Materials

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The use of Fiber Reinforced Polymer (FRP) composites for strengthening concrete structures has gained a lot of popularity in the past couple of decades. The major issue in the retrofitting of concrete structures with FRP is the accurate evaluation of flexural and shear strains of polymer composites at the bonding interface of epoxy and concrete. To address it, a comprehensive experimental study was planned and carbon fiber reinforced polymer (CFRP) composite was applied on the concrete surface with the help of adhesives. CFRP was used as an external mounted flexural and shear reinforcement to strengthen the beams. Flexural load tests were performed on a group of eight reinforced concrete beams. These beams were strengthened in flexural and shear by different reinforcement ratios of CFRP. The strain gauges were applied on the surface of concrete and CFRP strips to assess the strain of both CFRP and concrete under flexural and shear stresses. The resulting test data is presented in the form of load–deformation and strain values. It was found that the values of strains transferred to the FRP through the concrete are highly dependent on the surface tensile properties of concrete and debonding strength of the adhesive. The test results clearly indicated that the strength increment in flexural members is highly dependent on strain values of the CFRP.

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“…The increase in the shear strength of RC beams was in the range of 10-70% compared to the control beams. Chen et al [35], studied the failure of FRP wrapping types (full wrapping, side, and Ustrips) in an FRP strengthened RC beams and how it affects the shear behavior of the beam was examined by considering the shear crack opening and tried to be determined by the analytical study. They found that in the shear strengthening of FRP, the first crack load occurs at a higher shear load than the control beams In this study, an experimental program was planned and executed to investigate the effect of strengthening self-compacting concrete beams using carbon fiber-reinforced polymer (CFRP) fabrics with different U-wrapping CFRP with different widths and densities in shear.…”

Section: Introductionmentioning

confidence: 99%

Shear Behavior of Self-Compacting Concrete Beams Reinforced With B500wr and Strengthened With CFRP

Sadek¹,

El-latif

Nabil

2022

Journal of Al-Azhar University Engineering Sector

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Fiber Reinforced Polymer (FRP) has become increasingly attractive due to its advantageous low weight, high stiffness and strength-to-weight ratio, corrosion resistance, lower maintenance costs, and faster installation time. Experimental and numerical studies researches show that using (FRP) materials to strengthen reinforced concrete (RC) beams in shear is an effective method. The purpose of this paper is to study the effect of strengthening self-compacting concrete beams using carbon fiber-reinforced polymer (CFRP) fabrics with different wrapping schemes in shear. Five rectangular beams of a rectangular cross section of 100×250 mm and a length of 1650 mm were cast and tested under four-point bending. One beam was used as a control beam without external strengthening, while the other four beams were strengthened in shear using U-Wrapped CFRP with different widths and densities. The used CFRP led to an increase in the load-carrying capacity, failure load, displacement ductility ratio, and displacement ductility index, but energy ductility was decreased. The investigation results are presented in terms of ultimate load, deflection, tensile and compressive strains, and cracking pattern.

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Full-range FRP failure behaviour in RC beams shear-strengthened with FRP wraps

Cited by 42 publications

References 39 publications

Tensile Mechanical Properties and Failure Modes of a Basalt Fiber/Epoxy Resin Composite Material

Tensile Mechanical Properties and Failure Modes of a Basalt Fiber/Epoxy Resin Composite Material

Flexural and Shear Strain Characteristics of Carbon Fiber Reinforced Polymer Composite Adhered to a Concrete Surface

Shear Behavior of Self-Compacting Concrete Beams Reinforced With B500wr and Strengthened With CFRP

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