Cracking and Strength of Reinforced Concrete Structures in Flexure Strengthened With Carbon Fibre Laminates

Valivonis, Juozas; Skuturna, Tomas

doi:10.3846/13923730.2007.9636452

Cited by 22 publications

(12 citation statements)

References 32 publications

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“…R/C members resist bending moment using several mechanisms. Experimental investigations to predict the flexural strength of R/C members have been carried out by several researchers and several empirical formulas [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], based on experimental results, have been developed, Some of these formulas are used in prominent design codes such as the American Concrete Institute (ACI 440 R2) [6]. These formulas are used to predict the bending moment of concrete beams strengthen by CFRP, carry two point load as shown in figure (2) and they are functions of several flexural parameters.…”

Section: Ultimate Flexural Strength Of Rc Beams Strengthened By Cfrpmentioning

confidence: 99%

Modeling of ultimate load for R.C. beams strengthened with Carbon FRP using artificial neural networks

Yousif¹,

Jurmaa²

2010

(AREJ)

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The use of carbon fiber reinforced composite materials is an accepted technology that is being used in practice to strengthen existing reinforced concrete (R/C) elements. An artificial neural network (ANN) model was developed using past experimental data on flexural failure of R/C beams strengthened by carbon FRP. The input parameters cover the carbon sheet properties, beam geometrical properties and reinforcement properties; the corresponding output is the ultimate load capacity. The ANN prediction and the measured experimental values are compared with load prediction of ACI440.2R-02 formulas. A sensitivity study of parameters that affect ultimate load of R/C beams strengthened by carbon FRP is carried out. It is concluded that ANN can predict, to a good degree of accuracy, the ultimate load capacity of R/C beams strengthened by carbon FRP and it is a viable tool to carry out parametric study of flexural behavior of R/C beams strengthened by carbon FRP.

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Section: Ultimate Flexural Strength Of Rc Beams Strengthened By Cfrpmentioning

confidence: 99%

Modeling of ultimate load for R.C. beams strengthened with Carbon FRP using artificial neural networks

Yousif¹,

Jurmaa²

2010

(AREJ)

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“…Carbon fibers are widely used for dispersion reinforcement of conventional concrete in civil engineering to improve its mechanical properties and to prevent the formation of cracks due to deformation (Ferrari et al 2013;Qazi et al 2015;Tabatabaei et al 2014;Valivonis, Skuturna 2007;Wang, Adeli 2014). In the refractory castables, such fibers are not used because their operating temperature does not exceed 300-400 °C.…”

Section: Introductionmentioning

confidence: 99%

The effect of carbon and polypropylene fibers on thermal shock resistance of the refractory castable

Antonovič

Witek

Mačiulaitis

et al. 2017

Journal of Civil Engineering and Management

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This work investigates medium cement refractory castable with additives of carbon and polypropylene fibers. The peculiarities of microstructure changes in the fiber and castable matrix contact zone, channel formation, and changes of cold crushing strength of fiber additives, which have a refractory castable matrix under temperature treatment, were investigated. The investigation results allowed to predict that using a mix of fibers more effective than using them individually. The influence of fiber additives on the mechanical characteristics and thermal shock resistance of the refractory castable with fiber additives was tested. It was found that the addition of carbon fiber has a positive impact on the thermal shock resistance of the investigated castable, which is confirmed by the results obtained by thermal cycling, as well as by the values calculated for thermal shock resistance R4 and Rst. In addition, the results of the investigation of thermal cycling show that the value of the thermal shock resistance was highest when a mixed fiber additive (CF+PP) was used.

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“…So far, many researches [5][6][7][8][9][10][11] have been conducted to investigate the mechanical properties of the retrofitted members externally bonded with CFRP. It can be concluded that the bonding of the CFRP plates has a significant effect on enhancing the overall performance even for plates with a relatively low modulus of elasticity.…”

Section: Introductionmentioning

confidence: 99%

“…The strengthening technology externally bonded with CFRP can considerably increase the strength at bending, reduce the deflections as well as crack width in area of tension, and also change the mechanical behavior and failure pattern during service. The researches [5,[8][9][10] demonstrated that the cracking moment in reinforced concrete beams with CFRP can significantly increase by 218%, from 12% to 230%. They also found that in strengthened flexural members, cracks are seen in bigger numbers and closer to each other; however, they are narrower than in beams without strengthened reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance Evaluation of Concrete Beams Strengthened with Carbon Fiber Materials

Ding

Huang

Zhu

et al. 2013

Advances in Materials Science and Engineering

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As a kind of novel material of high strength and light weight, carbon fiber materials have been widely used in construction industry to repair the damaged bridges improving its mechanical performance. In this work, the reinforced plates made of carbon fiber materials (for short CFRP) are externally bonded to the bottom of concrete beams to enhance load capacity of beams. The strain energy release rates are calculated at the interest crack in concrete beams based on virtual crack closure technology using FEM and are chosen as the criterion to determine whether the mechanical properties of beams are strengthened by being externally bonded with CFRP. The effects of main crack propagation on plain concrete beam, on concrete beam strengthened with CFRP, and on inclined crack are also discussed. The comparison between the beams with and without CFRP shows that the CFRP significantly increases the loading capacity and crack resistance. It also shows that the main crack propagation can reduce loading capacity and crack resistance regardless of strengthening. The experiment observation also supports this. It proves the validity of the method, and it is concluded that in order to increase the loading capacity and crack resistance effectively, controlling over the crack propagation is necessary.

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Cracking and Strength of Reinforced Concrete Structures in Flexure Strengthened With Carbon Fibre Laminates

Cited by 22 publications

References 32 publications

Modeling of ultimate load for R.C. beams strengthened with Carbon FRP using artificial neural networks

Modeling of ultimate load for R.C. beams strengthened with Carbon FRP using artificial neural networks

The effect of carbon and polypropylene fibers on thermal shock resistance of the refractory castable

Mechanical Performance Evaluation of Concrete Beams Strengthened with Carbon Fiber Materials

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