Nonlinear analysis of Reinforced Concrete Columns with Fiber Reinforced Polymer Bars

Lotfy, Ehab M.

doi:10.1260/1708-5284.8.4.357

Cited by 8 publications

(13 citation statements)

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“…The increase of main FRP reinforcement ratio boosts the ductility of cross section which has a significant effect on ultimate strain (to 19%) and ultimate loads (to 22%) of columns. Study results of Ehab M. Lotfy [11] indicated that, with the main reinforcement ratio up to 1.7%, load-carrying capacity and reinforcement ratio follows a linear trend.…”

Section: Introductionmentioning

confidence: 98%

“…In the previous researches by Alsayed et al [2], Luca et al [4], Ehab M. Lotfy [11], Tobbi et al [22], Mohammad Z. Afifi et al [14], Mohamed et al [13], Richa Pateriya1 et al [17], Muhammad N. S. et al [15], Jianwei Tu et al [23], it was showed that, when replacing the longitudinal steel bars with the FRP bars by the same amount, the axial load-carrying capacity of FRP concentrically RC columns decreases by 13%-16%. In FRP RC columns, FRP bars contribute about 3%-10% of the total load-carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

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Load-Carrying Capacity of Short Concrete Columns Reinforced with Glass Fiber Reinforced Polymer Bars Under Concentric Axial Load

Duy¹,

Anh²,

Anh³

et al. 2019

IJEAT

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In this paper, 1 group of plain concrete square columns 150×150×600 mm and 11 groups of concrete columns reinforced with glass fiber reinforced polymer (GFRP) were cast and tested, each group contains of 3 specimens. These experiments investigated effect of the main reinforcement ratio, stirrup spacing and contribution of longitudinal GFRP bars on the load carrying capacity of GFRP reinforced concrete (RC) columns. Based on the experiment results, the relationship between load-capacity and reinforcement ratio and the plot of contribution of longitudinal GFRP bars to load-capacity versus the reinforcement ratio were built and analyzed. By increasing the reinforcement ratio from 0.36% to 3.24%, the average ultimate strain in columns at maximum load increases from 2.64% to 75.6% and the load-carrying capacity of GFRP RC columns increases from 3.4% to 25.7% in comparison with the average values of plain concrete columns. Within the investigated range of reinforcement ratio, the longitudinal GFRP bars contributed about 0.72%-6.71% of the ultimate load-carrying capacity of the GFRP RC columns. Meanwhile, with the same configuration of reinforcement, contribution of GFRP bars to load-carrying capacity of GFRP RC columns decreases when increasing the concrete strength. The influence of tie spacing on load-carrying capacity of reinforced columns was also taken into consideration. Additionally, experimental results allow us to propose some modifications on the existing formulas to determine the bearing capacity of the GFRP RC column according to the compressive strength of concrete and GFRP bars.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Load-Carrying Capacity of Short Concrete Columns Reinforced with Glass Fiber Reinforced Polymer Bars Under Concentric Axial Load

Duy¹,

Anh²,

Anh³

et al. 2019

IJEAT

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“…Few experimental studies have been conducted to investigate the behaviour of the concrete column reinforced with GFRP under concentric loading [2][3][4][5][6][7][8][9]. It was concluded that columns reinforced with GFRP bars behave in the same manner as those reinforced with steel bars.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Eccentric Concrete Columns Reinforced with Carbon Fibre‐Reinforced Polymer Bars

Othman

Mohammad

2019

Advances in Civil Engineering

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The use of steel bars as reinforcement is not preferred in some concrete structures because steel causes corrosion or electric magnetic field problems. One of the best alternatives to steel bars is carbon fibre-reinforced polymer (CFRP) bars. The experimental program consisted of 18 reinforced rectangular concrete columns under different eccentric loadings. Out of the 18 columns, 15 were reinforced with CFRP longitudinal rebars and ties and 3 were reinforced with conventional steel rebars and ties as reference columns. The following parameters were included in this study: the replacement of steel with CFRP bars, eccentricity of load, longitudinal reinforcement ratios, and tie spacing. Test results in terms of load-strain, load-mid height deflection curves, and crack patterns showed that the column reinforced with CFRP bars behaved similarly to the concrete column reinforced with conventional steel bars with a slight difference in axial and flexural capacity. The increment in CFRP longitudinal reinforcement ratios from 1.4% to 2.0% and 3.6% reasonably increased the maximum carrying capacity for different eccentricities used herein. The axial ratios of experimental to theoretical results (PExp./PTheor.) were determined for specimens in the present work and those from previous studies to assess the efficiency of the theoretical models.

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“…The results showed about 10 percent strength reduction in the GFRP reinforced columns from cases with steel reinforcement. Short confined concrete cylinders with different spacings (10,20,35, and 50 mm) of aramid spiral stirrups were studied by Leung and Burgoyne [5]. The experimental results showed that the peak load capacity of test cylinders decreased with the spiral pitch.…”

mentioning

confidence: 99%

“…Also, a small increase in the core confinement, strength, and stiffness of tested columns was achieved by decreasing the pitch of spiral warps. The structural performance of square concrete columns internally reinforced with GFRP rebars was evaluated under axial compressive load in [10]. The ductility increased with the main reinforcement ratios, rapidly with small ratios but the effects were quite low for large reinforcement ratios.…”

mentioning

confidence: 99%

Behavior and Performance of GFRP Reinforced Concrete Columns with Various Types of Stirrups

Prachasaree

Piriyakootorn

Sangsrijun

et al. 2015

International Journal of Polymer Science

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Fiber reinforced polymer (FRP) composites are gaining acceptance in concrete structural applications due to their high ratio of strength/stiffness to self-weight and corrosion resistance. This study focused on the structural behavior and the performance of concrete columns internally reinforced with glass fiber reinforced plastic (GFRP) rebars. Twelve series of concrete columns with varied longitudinal reinforcement, cross section, concrete cover, and type of lateral reinforcement were tested under compression loading. The results show that the amount of GFRP longitudinal and lateral reinforcement slightly affects the column strength. The lateral reinforcement affects the confining pressure and inelastic deformation, and its contribution to the confined compressive strength increases with the GFRP reinforcement ratio. In addition, the confining pressure increases both concrete strength and deformability in the inelastic range. The confinement effectiveness coefficient varied from 3.0 to 7.0 with longitudinal reinforcement. The average deformability factors were 4.2 and 2.8 with spirals and ties, respectively. Lateral reinforcement had a more pronounced effect on deformability than on column strength.

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Nonlinear analysis of Reinforced Concrete Columns with Fiber Reinforced Polymer Bars

Cited by 8 publications

References 1 publication

Load-Carrying Capacity of Short Concrete Columns Reinforced with Glass Fiber Reinforced Polymer Bars Under Concentric Axial Load

Load-Carrying Capacity of Short Concrete Columns Reinforced with Glass Fiber Reinforced Polymer Bars Under Concentric Axial Load

Behaviour of Eccentric Concrete Columns Reinforced with Carbon Fibre‐Reinforced Polymer Bars

Behavior and Performance of GFRP Reinforced Concrete Columns with Various Types of Stirrups

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