Performance Evaluation of Concrete Columns Reinforced Longitudinally with FRP Bars and Confined with FRP Hoops and Spirals under Axial Load

Mohamed, Hamdy M.; Afifi, Mohammad Z.; Benmokrane, Brahim

doi:10.1061/(asce)be.1943-5592.0000590

Cited by 231 publications

(89 citation statements)

References 7 publications

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“…GFRP bars are used as a viable replacement of steel bars in reinforced concrete structures. Due to nonmagnetic and nonconductive properties of the GFRP material, it can be preferred to use near sensitive instruments in laboratories and hospitals [1][2][3][4]. Also, the smaller concrete cover is used for GFRP-reinforced members due to the corrosion-resistant property of GFRP bars.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Raza

Khan

Ahmad

2019

Advances in Civil Engineering

117

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The present work demonstrates the nonlinear finite element analysis (NLFEA) of 13 concentrically and eccentrically loaded short rectangular concrete column specimens reinforced with GFRP and conventional steel bars. GFRP bars are lightweight having the high tensile strength and high corrosion resistance. An NLFEA model for the rectangular concrete specimens was developed using the commercial software ABAQUS Standard and calibrated for different materials and geometric parameters based on the previous experimental test results of the studied specimen. The behavior of reinforced concrete was modelled using the concrete damaged plasticity (CDP) model, the behavior of steel bars was simulated as a bilinear elastoplastic material, and the GFRP bars were considered as a linear elastic material. After the calibration of CDP parameters, the control sample was used for the further numerical parametric analysis to investigate the effect of critical parameters, i.e., the area of concrete (Ac), the compressive strength of concrete (fc′), and the ratio of longitudinal reinforcement (ρl) and transverse reinforcement (ρt) on the load-carrying capacity of columns. The results show that the selected NLFEA model can simulate the behavior of columns accurately and there was good agreement of numerical results obtained from ABAQUS Standard with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Raza

Khan

Ahmad

2019

Advances in Civil Engineering

117

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“…In order to investigate the contribution and the effect of GFRP bars on the concentrically loaded Reinforced Concrete (RC) columns, a few experimental studies were conducted (Alsayed et al 1999;De Luca 2009;De Luca et al 2010;Tobbi et al 2012;Pantelides et al 2013;Afifi 2013;Afifi et al 2014a,b;Mohamed et al 2014;Tobbi et al 2014). It was reported that the load carrying capacity of the GFRP-RC columns is about 13 to 16% smaller than the load carrying capacity of the steel-RC columns.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on Circular Concrete Columns Reinforced with GFRP Bars and Helices under Different Loading Conditions

2016

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Glass-fiber-reinforced polymer (GFRP) bar has emerged as a preferable alternative to steel bar in reinforced concrete (RC) members in harsh, corrosive, coastal environments in order to eliminate corrosion problems. However, only limited experimental studies are available on the performance and behavior of concrete columns reinforced with GFRP bars under different loading conditions. This study investigates the use of GFRP bars and GFRP helices (spirals) as longitudinal and transversal reinforcement, respectively, in RC columns. A total of 12 circular concrete specimens with 205-mm diameter and 800-mm height were cast and tested under different loading conditions. The effect of replacing steel with GFRP reinforcement and changing the spacing of the GFRP helices on the behavior of the specimens was investigated. The experimental results show that the axial load and bending moment capacity of the GFRP-RC columns are smaller than those of the conventional steel-RC columns. However, the ductility of the GFRP-RC columns was very close to the ductility of the steel-RC columns. It is concluded that ignoring the contribution of the GFRP bars in compression leads to a considerable difference between analytical and experimental results. The experimental results show that the axial load and bending moment capacity of the GFRP-RC columns are smaller than those of the conventional steel-RC columns. However, the ductility of the GFRP-RC columns was very close to the ductility of the steel-RC columns. It Page 2 of 52 is concluded that ignoring the contribution of the GFRP bars in compression leads to a considerable difference between analytical and experimental results.

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“…Few experimental studies were conducted to investigate the influence of replacing steel bars with FRP bars on the behaviour of square and circular concrete columns under concentric loads [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Axial load-axial deformation behaviour of circular concrete columns reinforced with GFRP bars and helices

Karim

Sheikh

Hadi

2016

Construction and Building Materials

120

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Fibre Reinforced Polymer (FRP) bars has attracted a significant amount of research attention in the last three decades to overcome the problems associated with the corrosion of steel reinforcing bars in reinforced concrete members. A limited number of studies, however, have investigated the behaviour of concrete columns reinforced with FRP bars. Also, available design standards either ignore the contribution of or do not recommend the use of GFRP bars in compression members. This study reports the results of experimental investigations of concrete specimens reinforced with GFRP bars and GFRP helices as longitudinal and transverse reinforcement, respectively. A total of five circular concrete columns of 205 mm in diameter and 800 mm in height were cast and tested under axial compression. The experimental results showed that reducing the spacing of the GFRP helices or confining the specimens with CFRP sheet led to improvements in the strength and ductility of the specimens. Also, an analytical model has been developed for the axial loadaxial deformation behaviour of the circular concrete columns reinforced with GFRP bars and helices. The model has been validated with the experimental results.

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Performance Evaluation of Concrete Columns Reinforced Longitudinally with FRP Bars and Confined with FRP Hoops and Spirals under Axial Load

Cited by 231 publications

References 7 publications

Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Numerical Investigation of Load‐Carrying Capacity of GFRP‐Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS

Experimental Investigations on Circular Concrete Columns Reinforced with GFRP Bars and Helices under Different Loading Conditions

Axial load-axial deformation behaviour of circular concrete columns reinforced with GFRP bars and helices

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