Analysis-oriented stress-strain model for FRP-confined predamaged concrete

Cao, Yugui; Zhang, Yang; Liu, Muyu; Lu, Zhen; Jiang, Cheng

doi:10.1016/j.jobe.2020.102121

Cited by 7 publications

(7 citation statements)

References 50 publications

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“…For FRP‐confined damaged concrete columns, the internal concrete is in a state of three‐way compression. The first principal stress σ 1 is the vertical stress of FRP‐confined concrete (the compressive strength of FRP‐confined damaged concrete

{\overset{true¯}{f}}_{cc}

), the second principal stress σ 2 and the third principal stress σ 3 are the lateral stress of FRP‐confined concrete (the confinement force f l provided by FRP), and f l is calculated by Equation (): 2,12,15

f_{l} goodbreak= \frac{2 E_{frp} ε_{frp} t_{frp}}{b} .

where E frp is the elastic modulus of FRP, ε frp is the ultimate strain of FRP, t frp is the thickness of FRP, and b is the diameter of a circular section or the side length of a square section.…”

Section: The Drucker–prager Yield Criterionmentioning

confidence: 99%

“…In this article, the error indexes AV and IAE 2,9,47,49–52 are used to evaluate the accuracy of the existing compressive strength model and the proposed compressive strength model. The equation is as follows:

italicAV goodbreak= \frac{\sum_{1}^{n} \frac{{italicTheo}_{i}}{{italicExpe}_{i}}}{n},

I italicAE = \frac{\sum_{1}^{n} (||, {Theo}_{i} - {Expe}_{i})}{\sum_{1}^{n} (||, {Expe}_{i})},

where Theo i is the predicted value of the model, Expe i is the experimental value; n is the number of test data point.…”

Section: Strength Model For Frp‐confined Damaged Concrete Under Quasi...mentioning

confidence: 99%

“…For FRP-confined damaged concrete columns, the internal concrete is in a state of three-way compression. The first principal stress σ 1 is the vertical stress of FRP-confined concrete (the compressive strength of FRP-confined damaged concrete f cc ), the second principal stress σ 2 and the third principal stress σ 3 are the lateral stress of FRP-confined concrete (the confinement force f l provided by FRP), and f l is calculated by Equation ( 4): 2,12,15…”

Section: Section Typementioning

confidence: 99%

“…Numerous studies have shown that fiber reinforced polymer (FRP), such as aramid fiber reinforced polymer (AFRP), basalt fiber reinforced polymer (BFRP), carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP), can significantly improve the load bearing and deformation capacity of damaged/ undamaged concrete structures. [1][2][3][4][5][6][7][8] To accurately predict the load bearing capacity of damaged concrete after FRP strengthening, many compressive strength models have been proposed. [9][10][11][12][13][14][15][16][17][18] Guo et al 19 found that a compressive strength model of FRP-confined undamaged concrete Discussion on this paper must be submitted within two months of the print publication.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of a compressive strength model for FRP‐confined damaged concrete columns based on the Drucker–Prager yield criterion

Zhang

Xiong

Musa

et al. 2022

Structural Concrete

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Fiber reinforced polymer (FRP) has been widely used in repairing and strengthening of damaged concrete columns due to its excellent material properties. Most of the existing compressive strength models for FRP-confined concrete columns have been established through regression analyses of experimental data, and only a few models were established based on theoretical derivation. Therefore, to extend these compressive strength models based on theoretical derivation, a new strength model based on the Drucker-Prager yield criterion was established in this article, which is suitable for predicting the strength of FRP-confined circular and square concrete columns with loaddamaged, fire-damaged and strain rate. To study the strength model of FRPconfined concrete columns, the author collected 675 test data from published literature and built a large database containing cross-section type, damage type, damage degree and strain rate. In this database, most of the existing strength models in the published literature and the model proposed in this article were evaluated. The evaluation results show that the model can accurately predict the compressive strength of FRP-confined circular and square concrete columns with undamaged, load-damaged, fire-damaged and strain rate.

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{\overset{true¯}{f}}_{cc}

f_{l} goodbreak= \frac{2 E_{frp} ε_{frp} t_{frp}}{b} .

Section: The Drucker–prager Yield Criterionmentioning

confidence: 99%

italicAV goodbreak= \frac{\sum_{1}^{n} \frac{{italicTheo}_{i}}{{italicExpe}_{i}}}{n},

I italicAE = \frac{\sum_{1}^{n} (||, {Theo}_{i} - {Expe}_{i})}{\sum_{1}^{n} (||, {Expe}_{i})},

where Theo i is the predicted value of the model, Expe i is the experimental value; n is the number of test data point.…”

Section: Strength Model For Frp‐confined Damaged Concrete Under Quasi...mentioning

confidence: 99%

Section: Section Typementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of a compressive strength model for FRP‐confined damaged concrete columns based on the Drucker–Prager yield criterion

Zhang

Xiong

Musa

et al. 2022

Structural Concrete

Self Cite

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show abstract

“…It can be seen that the proposed peak stress model of actively confined concrete has a good performance, as shown in Figure 2 . AV and IAE are adopted in this work to estimate the accuracy of the peak stress model [ 12 , 32 , 39 ].

…”

Section: Analytical Modelingmentioning

confidence: 99%

Unified Stress–Strain Model of FRP-Confined Square and Circle Rubber Concrete Columns

et al. 2022

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Studying the stress–strain relationship of fiber-reinforced polymer (FRP)-confined rubber concrete (RuC) plays an important role in its application in engineering projects. Most of the existing stress–strain relationship models are established based on the test data of FRP-confined rubber concrete with circular cross-sections, and the effect of the section shape is not considered. Therefore, an analysis-oriented stress–strain model of FRP-confined circular and square rubber concrete columns was studied in this paper for the first time. A database that includes the rubber particle content and section shape on the peak stress-peak strain and axial–lateral strain relationship of FRP-confined rubber concrete was established by collecting 235 test data from the literature. By modifying the key parameters in the existing FRP-confined normal concrete stress–strain relationship model, a unified stress–strain relationship model of FRP-confined RuC with circular and square columns is established. The proposed model is verified, and a good accuracy of the model is proven.

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Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

Diego

Martı́nez

Castro

et al. 2022

Archiv.Civ.Mech.Eng

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This paper presents a comprehensive experimental study on the behaviour of FRP-confined concrete in square and rectangular columns and focuses on some issues that might be addressed with a view to improving the predictive models. For this purpose, 31 prismatic concrete specimens with a height of 600 mm and low- and medium-strength concrete (20–35 MPa) were tested under centred compression. The parameters studied were the aspect ratio between the sides of the section (1, 1.5 and 2), the radius of curvature of the corners (20, 25 and 30 mm) and the number of carbon FRP layers applied. The experimental results included stress–strain curves of specimens and detailed information about the confined concrete strength and the axial and lateral strain achieved on the FRP jacket during the tests. The stress–strain response and ultimate condition are analysed, showing that FRP jacketing is an efficient technique for increasing the strength and strain capacity, but that confinement efficiency decreases as the aspect ratio of the section increases. In spite of such decrease, significant strength improvement was achieved for low-strength concrete in rectangular sections with aspect ratios of 1.5 (strength gain up to 81%), and even 2 (up to 36%). The axial strength of the tests was compared with the design criteria of four international guidelines, resulting in predictions that did not properly fit for rectangular sections. A predictive equation is proposed to assess the axial compressive strength of the FRP-confined concrete, which includes a better adjustment for the strain efficiency factor and the shape factor for rectangular columns.

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Analysis-oriented stress-strain model for FRP-confined predamaged concrete

Cited by 7 publications

References 50 publications

Analysis of a compressive strength model for FRP‐confined damaged concrete columns based on the Drucker–Prager yield criterion

Analysis of a compressive strength model for FRP‐confined damaged concrete columns based on the Drucker–Prager yield criterion

Unified Stress–Strain Model of FRP-Confined Square and Circle Rubber Concrete Columns

Experimental investigation on the compressive behaviour of FRP-confined rectangular concrete columns

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