Cyclic and Monotonic Compression Behavior of CFRP-Jacketed Damaged Noncircular Concrete Prisms

Dalgic, Korhan Deniz; Ispir, Medine; İlki, Alper

doi:10.1061/(asce)cc.1943-5614.0000603

Cited by 33 publications

(15 citation statements)

References 36 publications

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“…It can be seen that the hardening modulus ratio E 2 /E 2 decreases with increasing damage degree δ. This conclusion is consistent with existing reports [11][12][13], which found that the damage degree δ and concrete strength ratio f co / f 30 had a significant effect on the parameter value of the hardening modulus ratio E 2 /E 2 , and a hardening modulus function was developed by Wu et al [11] as follows: When the strain rate e is equal to ε0 (10 -5 /s), Equation (11) is equal to Equation (10), and the hardening modulus model 2 E degenerates into that for the FRP-confined pre-damaged concrete under quasi-static loading. The performance of Equation (11) is shown in Figure 12b, in which AV = 1.06 and IAE = 0.18.…”

Section: Hardening Modulus Esupporting

confidence: 94%

“…It can be seen that the hardening modulus ratio 22 EE decreases with increasing damage degree δ. This conclusion is consistent with existing reports [11][12][13], which found that the damage degree δ and concrete strength ratio EEdecreases with increasing strain rate ratio. Therefore, the effect of the strain rate should be considered in the model of the hardening modulus 2 E .…”

Section: Hardening Modulus 2 Esupporting

confidence: 93%

“…As the concrete damage level λ increased, the initial stiffness and hardening stiffness of the stress-strain curves decreased. This phenomenon is consistent with the conclusion reported in other papers [11][12][13]. In other words, the concrete damage level had an effect on the stress-strain relationship in FRP-constrained concrete columns under different strain rates.…”

Section: Stress-strain Responsessupporting

confidence: 93%

“…The existing literature concludes that the mechanical behaviors of FRP-confined intact concrete and damaged concrete are different [11][12][13][14][15][16]. As the degree of concrete damage increases, the compressive strength of FRP-confined pre-damaged concrete decreases.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

et al. 2020

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There are many studies on fiber-reinforced polymer (FRP)-confined pre-damaged concrete under quasi-static strain rates. However, few studies have focused on FRP-confined pre-damaged concrete under high strain rates. Thus, an experimental and analytical investigation was conducted to obtain the mechanical behavior of FRP-confined pre-damaged concrete under different strain rates. The results show that the stress–strain curves, ultimate stress, and strain values were affected by strain rate and the extent of concrete damage. A stress–strain model of FRP-confined pre-damaged concrete considering the strain rate was developed by modifying a stress–strain model of FRP-confined pre-damaged concrete under quasi-static loading. The proposed model was evaluated by using test data. The evaluation results show that the proposed model can predict the stress–strain behavior of FRP-confined pre-damaged concrete under different strain rates.

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Section: Hardening Modulus Esupporting

confidence: 94%

Section: Hardening Modulus 2 Esupporting

confidence: 93%

Section: Stress-strain Responsessupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

et al. 2020

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“…Strengthening and repairing of concrete columns using fiber reinforced polymer (FRP) have received much attention from material scientists and researchers, and it has been widely applied in construction industries . To have broad details and information about the confining materials, extensive studies on modeling the structural response of FRP‐strengthened concrete structures have been undertaken, especially on the mechanical physiognomies of FRP‐confined concrete structures. Several factors have been considered in developing models for FRP‐strengthened concrete.…”

Section: Introductionmentioning

confidence: 99%

Energy balance method for modeling ultimate strain of fiber‐reinforced polymer‐repaired concrete

Tijani

Lim

2019

Structural Concrete

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The energy balance method has been widely used in the extant literature to derive the ultimate axial strain of conventional confined concrete columns. However, researchers noted that this method yields unrealistic results compared to experimental data when it is applied to fiber-reinforced polymer (FRP) confined concrete columns. Therefore, it is deemed that the existing ultimate strain model based on the energy method cannot be directly applied to FRP-repaired concrete. With this model shortcoming in mind and through a theoretical analysis with proper calibration, the current study extended the energy balance approach to develop a generalized model to determine the ultimate strain of FRP repaired concrete columns. This proposed new model can be used to predict the ultimate strain of repaired columns under both concentric and eccentric loadings. Because this model is established in a unified form without any restrictions to the cross-sectional geometry, it is applicable to different shapes of repaired columns. On the other hand, although the energy balance method is unconservative for heavily damaged concrete, it exhibits a better performance with respect to the existing models when compared with the test result. K E Y W O R D Sconcrete structure, confinement, energy method, FRP, repairing, ultimate strain

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Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

Fanaradelli

Rousakis²

2020

Structural Concrete

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Confinement with fiber‐reinforcement polymer (FRP) materials is a technique, which can increase adequately the axial strain ductility of concrete. Plain and reinforced concrete columns, with circular, square and rectangular cross sections, confined with FRP materials, subjected to monotonic or cyclic compressive load, have been extensively studied over the last 35 years. Also, a lot of predictive expressions for peak and ultimate axial strength and strain, suitable for the available concrete sections, have been proposed. However, it is proven that it is difficult to accurately model and predict the behavior of the noncircular confined concrete columns, especially in the presence of internal longitudinal and transverse steel reinforcement, which is the real case for the majority of existing reinforced concrete structures. The presented study gathers all the available test results on square and rectangular reinforced or plain concrete columns confined with FRP materials and other novel techniques, subjected only to cyclic axial loading. It also assesses the performance of four significant expressions published in literature for the prediction of column load and deformation, proposed for the peak and ultimate conditions.

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Cyclic and Monotonic Compression Behavior of CFRP-Jacketed Damaged Noncircular Concrete Prisms

Cited by 33 publications

References 36 publications

Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

Effect of Strain Rates on the Stress–Strain Behavior of FRP-Confined Pre-Damaged Concrete

Energy balance method for modeling ultimate strain of fiber‐reinforced polymer‐repaired concrete

Assessment of analytical stress and strain at peak and at ultimate conditions for fiber‐reinforcement polymer‐confined reinforced concrete columns of rectangular sections under axial cyclic loading

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