The behavior of CFRP strengthened RC beams subjected to blast loading

Jahami, Ali; Temsah, Yehya; Khatib, Jamal; Baalbaki, Oussama; Kenai, Said

doi:10.34910/mce.103.9

Cited by 14 publications

(8 citation statements)

References 16 publications

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“…Tensile compression stress on beam supports has gone down since CFRP was used. Several studies [13][14][15][16][17][18][19] have shown that CFRP may improve how well it absorbs energy, holds loads, and bends in the middle. The study showed that rebar-reinforced plastic sheets made lightweight concrete slabs more resistant to bending.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks

Khadim,

Abdulridha

2024

Frattura Ed Integrità Strutturale

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The flexural behavior of lightweight concrete two-way slabs repaired or strengthened with externally bonded carbon fiber-reinforced polymer (CFRP) sheets is the subject of this study. The experiment included five reinforced lightweight concrete slab specimens with dimensions of 1000 mm in length, 1000 mm in width, and 120 mm in thickness. Tested one specimen without any strengthening and reinforced another specimen with a single layer of CFRP. The other specimens were repaired with a single layer of CFRP, applying damage ratios of 50%, 60%, or 70% of the ultimate load. Intentionally designed each slab to collapse under bending forces and maintained comparable dimensions. According to the experiment results, changing the degree of damage from 70% to 50% increases the ultimate load capacity by about 17.7%, and the ultimate deflection decreases by about 31.4%. CFRPs have the potential to fix structural damage under static stress testing conditions. However, it is essential to make sure that they stick well to surfaces that do not have suitable geometric properties or have been deformed. CFRP sheets effectively repaired the specimens, increasing the failure stress of the reinforced concrete slabs and preventing the spread of cracks.

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Section: Introductionmentioning

confidence: 99%

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks

Khadim,

Abdulridha

2024

Frattura Ed Integrità Strutturale

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“…Some researchers [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] found that strengthening with carbon-fiber-reinforced polymer (CFRP) composite wraps could improve the shear impact resistance of RC beams, prevent the development and expansion of shear cracks, and eventually restrict the shear damage. Suter et al [ 15 ] found earlier that wrapping RC columns transversely with aromatic fiber (Kevlar) composites could significantly enhance the shear impact resistance of columns.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Liu

Chen

et al. 2023

Materials

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This paper presents a numerical study examining the dynamic response and resistance mechanism of reinforced concrete (RC) columns strengthened with or without carbon-fiber-reinforced polymer (CFRP) wraps under lateral impact loading by using the software LS-DYNA. First, the information of eight column models was briefly introduced as part of the laboratory experimental program from the literature. Secondly, finite element (FE) models were established in terms of the geometries of impact tests. Then, a detailed comparison between numerical results and experimental results was made, and FE models showed a relatively high simulation accuracy. Subsequently, a series of parametric analyses were carried out with a focus on the effects of axial compression ratio, the boundary condition at the column top, the layer number of CFRP wraps, and the impact velocity and impact height on the dynamic responses of plain and strengthened columns. The results demonstrated that the CFRP retrofit mechanism was not activated during the initial Stage-I when the impact force rapidly increased to the first peak and then decreased to zero. CFRP strengthening came into play in the second stage, Stage-II, and affected the response of the shear force and moment along the column height, as well as had a great influence on the control of shear damage. The dynamic response of RC columns was more sensitive to the impact velocity than to other parameters, regardless of whether CFRP wrapping was applied. The axial compression ratio would have a different influence on the column failure mode if the impact velocity was varied. The variation in impact height and boundary condition at the column top had little influence on the damage mode of strengthened columns.

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“…CFRP cloth is favored in reinforcement and repair works because of its light material, appearance, and mechanical properties. In the blast impact load, the CFRP configuration still improves concrete failure resistance [8]. GFRP has excellent overall performance compared with other fiber materials and has certain advantages in price.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties on Various FRP-Reinforced Concrete in Cold Regions

Zou

et al. 2023

Buildings

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The evaluation of frost resistance varies with different reinforcement methods, but it is a hot research topic for concrete reinforced with Fiber-Reinforced plastic (FRP). Freezing and thawing tests of FRP-reinforced concrete prisms and cylinders are presented to simulate beams and piers of buildings in cold climates. To evaluate the specimens’ frost resistance, tests with various reinforcement techniques, morphological analysis, weight tests, and relative dynamic modulus of elasticity tests were used. Examined also were the variations in stress–strain curves for axial compression tests and load–displacement curves for bending tests following various freeze–thaw cycles. The findings indicated that after 100 freeze–thaw cycles, the weight of unreinforced concrete cylinders decreased by 9.7%, and its compressive strength decreased by 27.6%. On the other hand, CFRP-reinforced concrete cylinders (Carbon-Fiber-Reinforced Plastics) and GFRP (Glass-Fiber-Reinforced Plastics) gained 1.1% and 1.58% in weight, respectively, while the compressive strength decreased by 7.4% and 8%. After 100 freeze–thaw cycles, the weights of concrete prisms with reinforcement, without reinforcement, and with CFRP reinforcement decreased by 12.13%, 8.7%, and 9.6%, respectively, and their bending strength was reduced by 20%, 42%, and 53%, respectively. The frost resistance of the two FRP-reinforced concrete types had significant differences under freeze–thaw cycles because the prismatic specimens were not fully wrapped with FRP materials. Finally, finite element software ABAQUS was used to simulate the freeze–thaw cycle test of the two specimens. Calculated values were compared to experimental results for the load–displacement curve and the axial stress–strain curve under bending load. The comparison of peak displacement produced a maximum error of 8.6%, and the FRP-reinforced concrete model validity was verified.

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The behavior of CFRP strengthened RC beams subjected to blast loading

Cited by 14 publications

References 16 publications

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks

Behavior of Reinforced Lightweight Concrete Slab with Initial Cracks

Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

Mechanical Properties on Various FRP-Reinforced Concrete in Cold Regions

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