Flexural experiment and capacity investigation of CFRP repaired RC beams under heavy pre-damaged level

Yu, Feng; Zhou, Hao; Jiang, Nan; Fang, Yuan; Song, Jie; Feng, Chaochao; Guan, Yucong

doi:10.1016/j.conbuildmat.2019.117030

Cited by 29 publications

(8 citation statements)

References 21 publications

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“…The results showed that this method could increase the bearing capacity by 1.34 times. Yu et al [39] investigated the strengthening of severely damaged concrete beams using CFRP sheets. They showed that installing CFRP sheets can increase the maximum beam load by about 2.13 times.…”

Section: Comparative Study With Other Studiesmentioning

confidence: 99%

Strengthening of RC Beams using Steel Plate-Fiber Concrete Composite Jackets (Finite Element Simulation and Experimental Investigation)

Shadmand

Hedayatnasab

Kohnehpooshi

2022

IJE

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In this research, steel plate-fiber concrete composite jackets (SPFCJ) was used to strengthen the RC beams. The accuracy of the analysis method was evaluated by modeling RC beams fabricated in the laboratory, and a good agreement was observed. Variables in the finite element method (FEM) analysis include the strength class of concrete used in the main beam (15,20, and 25 MPa), the beam length (1.4 and 2.8 m), the type of jackets (RC jacket, SPFCJ, and CFRP sheet), and jacket thickness (40, 60 and 80 mm). SPFCJ is effective for all three concrete grades and increased the energy absorption capacity by 1.88, 2.07, and 2.25 times, respectively. The bearing capacity of the strengthened beam with 60 mm composite jackets increased by 79 and 20% more than the values corresponding to jackets with 40 and 80 mm thickness. The jacket thickness parameter significantly influences the response of strengthened beams with the proposed composite jackets. Depending on the dimensions and geometric characteristics of the beam, the appropriate thickness for the jacket should be considered, and increasing the thickness can not always improve the beam bearing capacity.

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Section: Comparative Study With Other Studiesmentioning

confidence: 99%

Strengthening of RC Beams using Steel Plate-Fiber Concrete Composite Jackets (Finite Element Simulation and Experimental Investigation)

Shadmand

Hedayatnasab

Kohnehpooshi

2022

IJE

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“…Taking full advantages of excellent mechanical properties of FRP materials, several methods for strengthening concrete structures with FRP materials have been proposed and widely applied in engineering. [1][2][3][4][5][6][7][8][9][10][11][12] A series of theoretical and experimental investigations have been carried out on FRP strengthened RC columns. [13][14][15][16] Mohamed, Belouar and Alsayed [17][18][19] conducted the experimental studies on mechanical behaviors of concrete columns strengthened with FRP under axial compression and indicated that the confinement effect of FRP on core concrete could effectively improve strength, ultimate strain, and ductility of specimens.…”

Section: Introductionmentioning

confidence: 99%

“…The existing studies have shown that fiber reinforced polymer (FRP) exhibits many advantages, such as high strength, light weight, convenient construction and corrosion resistance, and so on. Taking full advantages of excellent mechanical properties of FRP materials, several methods for strengthening concrete structures with FRP materials have been proposed and widely applied in engineering 1–12 . A series of theoretical and experimental investigations have been carried out on FRP strengthened RC columns 13–16 .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the eccentric performances of high predamaged rectangular reinforced concrete columns strengthened with carbon fiber reinforced polymer

Zou

Fang

et al. 2022

Structural Concrete

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The mechanical behaviors of 12 high predamaged reinforced concrete (RC) rectangular columns strengthened with carbon fiber reinforced polymer (CFRP) under eccentric compression were experimentally investigated. The effects of the predamaged degree (δ), CFRP strips spacing (s f ) and eccentricity (e) on failure mode, bearing capacity, strain behaviors of CFRP strengthened predamaged columns were examined systematically. Test results demonstrated that the strengthened RC columns with small-eccentricity were destroyed by the yielding of compressive longitudinal steel bars and the crushing of compression concrete while the transverse CFRP strips were not ruptured. The failure mode of the strengthened RC columns with large-eccentricity was distinguished by the yielding of tensile and compressive longitudinal steel bars, the rupturing of longitudinal CFRP sheet, and the crushing of compressive concrete. With the increase of predamaged degree or eccentricity, the maximum bearing capacity of specimens decreased. In contrast, CFRP strips spacing had little effect on bearing capacity. Considering the effect of predamaged degree and eccentricity, a modified model for conveniently predicting the stress-strain relationship of CFRP strengthened predamaged RC columns under eccentric compression was proposed. On the basis of experimental study, the influence coefficients of predamaged degree and eccentricity and a strain distribution coefficient of CFRP strips were introduced, a calculation formula for predicting bearing capacity of high predamaged rectangular RC columns strengthened with CFRP under eccentric compression was proposed and validated test data with good agreement.bearing capacity, concrete column, damaged degree, eccentric loading, failure mode, fiberreinforced polymer, reinforcement, stress-strain relationship Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…The efficiency of CFRP for strengthening of flexural RC beams with CFRP has been studied by many authors [1][2][3][4][5][6][7][8][9]. However, there are not enough investigations made directly on experimental, analytical and numerical analysis of pre-cracked RC structures strengthened with CFRP [10][11][12]. There is also relatively high price of CFRP, as well as it is difficult to predict the level of concrete damage.…”

Section: Introductionmentioning

confidence: 99%

“…The strengthening of CFRP is very important for the improvement of structural properties. Application of CFRP enhances flexural capacity, increases stiffness, reduces crack widths and spacing [11].…”

Section: Introductionmentioning

confidence: 99%

Stiffness and Strength Analysis of Flexural RC beams strengthened with CFRP Sheets Considering the Influence of Pre-cracking

Lisauskas

Augonis

Zingaila

et al. 2020

mech

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This paper presents experimental, numerical and analytical analysis of newly cast and pre-cracking flexural reinforced concrete beams strengthened with CFRP. In total, 9 intermediate-scale composite beams were cast and tested using 4-point bending test setup. Midspan deflection, width of the cracks, concrete and CFRP strains were measured during the experimental program. Clear efficiency of composite pre-cracked beams was observed in comparison to newly cast beams: enhanced flexural capacity and increased stiffness after appearance of primary cracks in tension zone. Good agreement was found comparing experimental and theoretical (EC2) deflections of RC beams strengthened with CFRP. However, for more detailed verification, the analysis should be extended with more specimens. The shear stress at the end of CFRP sheets between the concrete and CFRP increased rapidly until reaching maximum slip value, when the reinforced concrete beam strengthened with CFRP reaches 60-90 % utilization of load bearing capacity. All experimental results were compared with numerical and analytical calculations. Experimental, numerical and analytical results were in sufficiently good agreement.

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Flexural experiment and capacity investigation of CFRP repaired RC beams under heavy pre-damaged level

Cited by 29 publications

References 21 publications

Strengthening of RC Beams using Steel Plate-Fiber Concrete Composite Jackets (Finite Element Simulation and Experimental Investigation)

Strengthening of RC Beams using Steel Plate-Fiber Concrete Composite Jackets (Finite Element Simulation and Experimental Investigation)

Experimental study on the eccentric performances of high predamaged rectangular reinforced concrete columns strengthened with carbon fiber reinforced polymer

Stiffness and Strength Analysis of Flexural RC beams strengthened with CFRP Sheets Considering the Influence of Pre-cracking

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