Cross-Sectional Unification on the Stress-Strain Model of Concrete Subjected to High Passive Confinement by Fiber-Reinforced Polymer

Cao, Yugui; Jiang, Cheng; Wu, Yu-Fei

doi:10.3390/polym8050186

Cited by 64 publications

(35 citation statements)

References 54 publications

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“…Figure 5 shows the axial compressive stress-strain behavior of all the FRP-confined FLWAC cylinders. Much like the stress-strain curves of FRP confined NC [ 29 , 52 , 53 , 54 ], the curves for FRP-confined FLWAC also display a monotonically ascending bi-linearity, and the stiffness rapidly decreases after the transition zone. Previous researchers have intensively studied the stress determined the transition zone for FRP-confined NC, and it is concluded that the stress is around the strength of the unconfined concrete [ 17 ].…”

Section: Test Resultsmentioning

confidence: 99%

Effects of Aggregate Types on the Stress-Strain Behavior of Fiber Reinforced Polymer (FRP)-Confined Lightweight Concrete

Sui

Xing

et al. 2018

Sensors

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The realization of reducing concrete self-weight is mainly to replace ordinary aggregates with lightweight aggregates; such replacement usually comes with some intrinsic disadvantages in concrete, such as high brittleness and lower mechanical properties. However, these shortages can be effectively remedied by external confinement such as fiber reinforced polymer (FRP) jacketing. To accurately predict the stress-strain behavior of lightweight concrete with lateral confinement, it is necessary to properly understand the coupling effects that are caused by diverse aggregates types and confinement level. In this study, FRP-confined lightweight concrete cylinder with varying aggregate types were tested under axial compression. Strain gauges and linear variable displacement transducers were used for monitoring the lateral and axial deformation of specimens during the tests. By sensing the strain and deformation data for the specimens under the tri-axial loads, the results showed that the lateral to axial strain relation is highly related to the aggregate types and confinement level. In addition, when compared with FRP-confined normal weight aggregate concrete, the efficiency of FRP confinement for lightweight concrete is gradually reduced with the increase of external pressure. Replace ordinary fine aggregate by its lightweight counterparts can be significantly improved the deformation capacity of FRP-confined lightweight concrete, meanwhile does not lead to the reduction of compressive strength. Plus, this paper modified a well-established stress-strain model for an FRP-confined lightweight concrete column, involving the effect of aggregate types. More accurate expressions pertaining to the deformation capacity and the stress-strain relation were proposed with reasonable accuracy.

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Section: Test Resultsmentioning

confidence: 99%

Effects of Aggregate Types on the Stress-Strain Behavior of Fiber Reinforced Polymer (FRP)-Confined Lightweight Concrete

Sui

Xing

et al. 2018

Sensors

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“…The compared results are shown in Figure 7e,f, in which the error index AV values were 0.24 and 0.22 for ultimate strain and stress, respectively, and IAE values were 0.24 and 0.22 for ultimate strain and stress, respectively. The error indexes AV and IAE [2,9,[31][32][33] are defined in Equations (3) and (4), respectively. It can be seen that there is an error between the theoretical value and the experimental value.…”

Section: The Ultimate Conditionmentioning

confidence: 99%

“…where f 30 is the concrete compressive strength of 30 MPa. (9) When the strain rate ̇ is equal to ε0 (10 -5 /s), Equation 9degenerates to the elastic limit stress of the confined concrete under quasi-static loading. Therefore, Equation (9) is reasonable.…”

Section: Elastic Limit Stress F Omentioning

confidence: 99%

“…The proposed stress-strain model consists of Equations (5), (7), (9), and (11) and the n value. Theoretical stress-strain curves can be drawn by using the proposed model.…”

Section: The Performance Of the Proposed Modelmentioning

confidence: 99%

“…As a kind of reinforcement material, fiber-reinforced polymer (FRP) is widely used in repairing and strengthening damaged concrete columns [1][2][3][4][5][6][7], beams, girders, and slabs [8], owing to its advantages of light weight, corrosion resistance, and convenient construction. Extensive studies have been conducted on the mechanical behavior of FRP-confined intact concrete under quasi-static loading, and more than 90 stress-strain models have been proposed [9,10].…”

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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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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Cross-Sectional Unification on the Stress-Strain Model of Concrete Subjected to High Passive Confinement by Fiber-Reinforced Polymer

Cited by 64 publications

References 54 publications

Effects of Aggregate Types on the Stress-Strain Behavior of Fiber Reinforced Polymer (FRP)-Confined Lightweight Concrete

Effects of Aggregate Types on the Stress-Strain Behavior of Fiber Reinforced Polymer (FRP)-Confined Lightweight 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

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