A novel and effective anchorage system for enhancing the flexural capacity of RC beams strengthened with FRCM composites

Aljazaeri, Zena R.; Janke, M.; Myers, John J.

doi:10.1016/j.compstruct.2018.10.110

Cited by 29 publications

(9 citation statements)

References 15 publications

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“…Moreover, all beams used one stirrup 8mm each 170 mm as shear reinforcement to prevent the failure due to shear, and all beams have 20 mm concrete cover, as shown in Figure (7). These beams were reinforced with PBO-FRCM layers to enhance its flexural strength, the characteristics of each beam are shown in Table ( 4). Each beam in this study equivalent to a corresponding beam in the experimental study of Luciano Ombres, [1], see Table (5).…”

Section: Details Of Analyzed Beamsmentioning

confidence: 99%

“…The failure mode and the ultimate strength of the investigated beam depend on the type, number, and the shape of FRCM layer. Finally, an experimental study of the effect of a novel and effective anchorage system for enhancing the flexural capacity of RC beams strengthened with FRCM composites was investigated by Zena R. Aljazaeri, et al, [4]. They investigated the effect of two anchorage systems on the failure of FRCM layer, the two anchorages were a glass spike anchor and a novel U-wrapped anchor.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Finite-Element Analysis for Rc Beams Strengthened With Fabric-Reinforced Cementitious Matrix

Mohamed

Arafa

Drar

et al. 2020

JES. Journal of Engineering Sciences

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Because of the shortcomings of the externally bonded system that mainly consists of epoxy and FRP sheets, the fabric-reinforced cementitious matrix, (FRCM) represents a viable solution in the strengthening of reinforced concrete beams. The FRCM layers consist of fabric mesh embedded in an inorganic stabilized cementitious mortar. Many experimental studies examined the impact of strengthening of RC beams with the FRCM layers, but the numerical investigations are limited. This study is therefore aimed at introducing a numerical study investigating the behavior of RC beams reinforced with FRCM layer. The main goal of this paper is to verify the FEM results with the experimental results that are available in the previous study [1], and to provide a parametric study. The investigated beams in this paper are 150 mm × 250 mm× 3000 mm with two reinforcement ratios. One, two, and three-layers of PBO, (P-Phenylene Benzobis Oxazole) FRCM were investigated as strengthening of the simulated beams were strengthened with. The numerical validation included load-deflection curve, loadstrain of both concrete and PBO-FRCM, strain distribution, cracks series and failure Mohamed Nagah et al., Nonlinear Finite-Element Analysis for Rc Beams Strengthened…… mode. The built model gave an accurately prediction of the attitude of the investigated beams. The results also indicated that the rise in the reinforcement ratio or the amount of FRCM layers contributed to improving behavior under both ultimate and serviceability limit states.

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Section: Details Of Analyzed Beamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear Finite-Element Analysis for Rc Beams Strengthened With Fabric-Reinforced Cementitious Matrix

Mohamed

Arafa

Drar

et al. 2020

JES. Journal of Engineering Sciences

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“…The type, number, and the shape of FRCM layer had a large effect on failure shape and the ultimate capacity of the studied beams. Moreover, the influence of an innovative and efficient anchorage mechanism for improving the flexural capacity of RC beams reinforced with FRCM was discussed by Zena R. Aljazaeri et al [13]. The influence of two anchorage systems (a glass spike and a U-wrapped anchor) on the failure of FRCM layer was discussed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Parametric Study of RC Beams Strengthened with Fabric-Reinforced Cementitious Matrix (FRCM)

Drar

Mohamed

Arafa

et al. 2022

Sohag Engineering Journal

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The epoxy bonded system has several drawbacks like low resistance fire. Fabric-reinforced cementitious matrix (FRCM) which comprises of fabric textiles buried in an inorganic mortar resulting in a competitive technology on strengthening RC structures. The numerical studies of this technique are slightly limited. This study presented a finite element modeling of the flexure behavior of RC beams reinforced with FRCM layers. This modeling is verified using a previous experimental study which indicates a good verification between numerical and experimental results. Large-scale beams were proposed. The number and type of FRCM layers with five different reinforcement ratios are investigated as studied parameters in this study. Moreover, two shapes of FRCM layers were used. The results revealed that both ultimate and total workability of the examined beams improve by increasing both reinforcement ratio and number of FRCM layers. U-wrapped layer had a significant improvement for beams behavior compared with the straight layer.

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“…Nevertheless, an inadequate bond and adherence between the fabric and matrix may hinder any improvement in the flexural capacity [8,14]. Although increasing the number of FRCM layers results in a nonproportional increase in the strength gain, it reduces the beam ductility and deformational capacity [5][6][7][15][16][17][18][19][20]. Despite their potential to increase the flexural strength gain, additional FRCM composite layers could change the failure mode from concrete crushing after steel yielding (i.e., ductile mode of failure) or fabric slippage from the matrix to a premature, sudden failure due to intermediate crack debonding or sudden detachment from the concrete substrate [9,15,17].…”

Section: Introductionmentioning

confidence: 99%

Continuous Reinforced Concrete Beams Strengthened with Fabric-Reinforced Cementitious Matrix: Experimental Investigation and Numerical Simulation

et al. 2021

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This paper aims to examine the nonlinear flexural behavior of continuous RC beam specimens strengthened with fabric-reinforced cementitious matrix (FRCM) composites through experimental testing and numerical modeling. A total of nine two-span RC beam specimens were constructed and tested. Test parameters included the type of FRCM (carbon (C-FRCM) and polyparaphenylene benzobisoxazole (PBO-FRCM), location of strengthening (sagging and hogging regions) and number of FRCM layers (two and four layers). Test results indicated that sagging strengthening resulted in a strength gain in the range of 17 to 29%, whereas hogging strengthening increased the load capacity by 9 to 17%. The use of C-FRCM resulted in a higher strength gain than that provided by PBO-FRCM composites. Specimens strengthened with PBO-FRCM exhibited, however, higher ductility and deformational capacity than those of their counterparts strengthened with C-FRCM. Doubling the number of FRCM layers resulted in no or insignificant increase in the load capacity but reduced the beam ductility. Specimens strengthened in the sagging regions exhibited moment redistribution ratios of 13 to 26% between the hogging and sagging regions. Insignificant moment redistribution was recorded for the specimens strengthened in the hogging region. Three-dimensional (3D) numerical simulation models, with and without an interfacial bond-slip law at the fabric–matrix interface, were developed. The inclusion of the bond-slip law in the modeling had an insignificant effect on predicted response. Although the models tended to underestimate the deflection, the predicted load capacities were within a 12% error band. Numerical findings were in agreement with those obtained from laboratory testing.

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A novel and effective anchorage system for enhancing the flexural capacity of RC beams strengthened with FRCM composites

Cited by 29 publications

References 15 publications

Nonlinear Finite-Element Analysis for Rc Beams Strengthened With Fabric-Reinforced Cementitious Matrix

Nonlinear Finite-Element Analysis for Rc Beams Strengthened With Fabric-Reinforced Cementitious Matrix

Numerical Parametric Study of RC Beams Strengthened with Fabric-Reinforced Cementitious Matrix (FRCM)

Continuous Reinforced Concrete Beams Strengthened with Fabric-Reinforced Cementitious Matrix: Experimental Investigation and Numerical Simulation

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