Influence of fibers on flexural behavior and ductility of concrete beams reinforced with GFRP rebars

Issa, Mohamed S.; Metwally, Ibrahim M.; Elzeiny, S. M.

doi:10.1016/j.engstruct.2011.02.014

Cited by 131 publications

(47 citation statements)

References 4 publications

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“…To illustrate the prediction accuracy of ACI.440 equations, a comparison between ACI equation and experimental results is also made referring to the literature [8,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] including the experimental deflection-moment data of 91 concrete beams reinforced with FRP bars in the database collected, as in Table 4.…”

Section: Deflection Prediction Deviationmentioning

confidence: 99%

Experimental study on the flexural deflections of concrete beam reinforced with Basalt FRP bars

2014

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This paper presents an experimental study of the flexural defections of concrete beam reinforced with basalt FRP bars. Six concrete beams with different BFRP reinforcement ratio and one comparative beam reinforced with steel rebar are tested in laboratory. Numerical simulations using sectional analysis method and spatial FEM are performed. The experimental results can fit well with numerical simulation results. Analysis and experimental results in the literature collected indicate that the ACI-440.1R-06 equations underestimate the deflection of FRP-RC beams. Based on the experimental and numerical simulation results, a modified equation of the flexural rigidity is proposed to calculate the deflection of the FRP-RC beams. The proposed equation can fit better with the experimental results than the ACI-440.1R-06 equations.

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Section: Deflection Prediction Deviationmentioning

confidence: 99%

Experimental study on the flexural deflections of concrete beam reinforced with Basalt FRP bars

2014

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“…22) to account for the reduced tension stiffening in the FRP-reinforced members [45]. Table 5 summarises the predicted midspan deflections at service condition Δs-theo of the tested beams based on ACI 4401.R-06.…”

Section: Comparison With Current Design Provisionsmentioning

confidence: 99%

Evaluation of the flexural strength and serviceability of geopolymer concrete beams reinforced with glass-fibre-reinforced polymer (GFRP) bars

Maranan

Manalo

Benmokrane

et al. 2015

Engineering Structures

126

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Geopolymer concrete reinforced with glass-fibre-reinforced polymer (GFRP) bars can provide a construction system with high durability, high sustainability, and adequate strength. Few studies deal with the combined use of these materials, and this has been the key motivation of this undertaking. In this study, the flexural strength and serviceability performance of the geopolymer concrete beams reinforced with GFRP bars were evaluated under a four-point static bending test. The parameters investigated were nominal bar diameter, reinforcement ratio, and anchorage system. Based on the experimental results, the bar diameter had no significant effect on the flexural performance of the beams. Generally, the serviceability performance of a beam is enhanced when the reinforcement ratio increases. The mechanical interlock and friction forces provided by the sand coating was adequate to secure an effective bond between the GFRP bars and the geopolymer concrete. Generally, the ACI 4401.R-06 and CSA S806-12 prediction equations underestimate the beam strength. The bending-moment capacity of the tested beams was higher than that of FRP-reinforced concrete beams from the previous studies.2

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“…In another investigation [4], it was shown that the presence of sufficient stirrups increased the concrete confinement in critical zones and, consequently, enhanced the concrete compression ductility. Wang and Belarbi [5] and Issa et al [6] observed that the addition of randomly distributed polypropylene fibres to the concrete mix has improved the ductility of FRP reinforced concrete beams. A hybrid system consisting of both FRP and steel reinforcement was also introduced to improve reinforced concrete element ductility [7].…”

Section: Introductionmentioning

confidence: 99%

Moment redistribution in continuous FRP reinforced concrete beams

Kara

Ashour

2013

Construction and Building Materials

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The main purpose of this paper is to assess moment redistribution in continuous concrete beams reinforced with fibre reinforced polymer (FRP) bars. A numerical technique based on equilibrium of forces and full compatibility of strains has been developed to evaluate the moment-curvature relationships and moment capacities of FRP and steel reinforced concrete sections. Moment redistribution has then been assessed by comparing elastic and experimental moments at failure, and moment capacity at critical sections of continuous FRP reinforced concrete beams reported on the literature.The curvature of under reinforced FRP sections was large at FRP rupture but failure was sudden, that would not allow any moment redistribution. On the other hand, FRP over reinforced sections experienced higher curvature at failure than steel over reinforced sections owing to the lower FRP modulus of elasticity. Although the experimental and elastic bending moment distributions at failure are significantly different for many beams tested elsewhere, in particular CFRP reinforced concrete beams, the experimental bending moment over the middle support at failure was far lower than the corresponding moment capacity owing to the de-bonding of FRP bars from concrete in the middle support region. Furthermore, the hogging moment redistribution over the middle support is always larger than that at mid-span by around 66%. It was also shown that the load 2 capacity prediction of continuous FRP reinforced concrete beams using the de-bonding moment at the middle support section was the closest to the experimental failure load.

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Influence of fibers on flexural behavior and ductility of concrete beams reinforced with GFRP rebars

Cited by 131 publications

References 4 publications

Experimental study on the flexural deflections of concrete beam reinforced with Basalt FRP bars

Experimental study on the flexural deflections of concrete beam reinforced with Basalt FRP bars

Evaluation of the flexural strength and serviceability of geopolymer concrete beams reinforced with glass-fibre-reinforced polymer (GFRP) bars

Moment redistribution in continuous FRP reinforced concrete beams

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