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

Karim, Hogr; Sheikh, M. Neaz; Hadi, Muhammad N.S.

doi:10.1016/j.conbuildmat.2016.02.219

Cited by 118 publications

(53 citation statements)

References 36 publications

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“…Providing spirals activated the lateral confinement at the load-deformation part after 1 , so that columns A-50-26.8, A-100-26.8, and A-150-26.8 retained most of the applied load with only a 1%, 10%, and 7% reduction in 1 , respectively. Karim, et al (2016) made similar observations. After that point, the lateral expansion of the cracking concrete was restricted by the lateral spirals, allowing the column to continue resisting the applied load at the post-loading stage at which point the concrete cover no longer makes a load contribution.…”

Section: Load-deformation Behaviorsupporting

confidence: 60%

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Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns

et al. 2020

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Hollow concrete columns (HCCs) are one of the preferred construction systems for bridge piers, piles, and poles because they require less material and have a high strength-to-weight ratio. While spiral spacing and concrete compressive strength are two critical design parameters that control HCC behavior, the deterioration of steel reinforcement is becoming an issue for HCCs. This study explored the use of glassfiber-reinforced-polymer (GFRP) bars as longitudinal and lateral reinforcement in hollow concrete columns and investigated the effect of various spiral spacing and different concrete compressive strengths (fc'). Seven hollow concrete columns with inner and outer diameters of 90 mm and 250 mm, respectively, and reinforced with six longitudinal GFRP bars were prepared and tested. The spiral spacing was no spirals, 50 mm, 100 mm, and 150 mm; the fc' varied from 21 to 44 MPa. Test results show that reducing the spiral spacing resulted in increased HCC uniaxial compression capacity, ductility, and confined strength due to the high lateral confining efficiency. Increasing fc', on the other hand, increased the axial-load capacity but reduced the ductility and confinement efficiency due to the brittle behavior of high compressive-strength concrete. The analytical models considering the axial-load contribution of the GFRP bars and the confined concrete core accurately predicted the post-loading behavior of the HCCs.

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Section: Load-deformation Behaviorsupporting

confidence: 60%

“…6]. Equation (4) was adopted from Karim, et al (2016), who evaluated the lateral confinement of the solid GFRP-reinforced columns, and Eq. (6) from Mander, et al (1988) to reduce the lateral-stress effectiveness caused by the discontinuous lateral confinement.…”

Section: Design-load Capacitymentioning

confidence: 99%

Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns

et al. 2020

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“…Muhammad N.S. Hadi et al [8] suggested following formula in which the confinement effect was taken into account:…”

Section:  mentioning

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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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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“…Table 4 summarizes the test results of all concrete columns. In this study, the ductility of the specimens was calculated as the ratio of the axial deformation at the ultimate load to the axial deformation at the first peak load [35][36][37]. For the specimens without a clear first peak load, axial deformation at the transition point between the first and second ascending parts was taken [36,37].…”

Section: Axial Load-axial Deformation Behaviourmentioning

confidence: 99%

Behaviour of concrete-encased concrete-filled FRP tube (CCFT) columns under axial compression

Wang

Sheikh

Hadi

et al. 2017

Engineering Structures

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A new composite column named concrete-encased concrete-filled fibre reinforced polymer tube (CCFT) column has been proposed in this study. This composite column consists of an inner concrete-filled fibre reinforced polymer (FRP) tube, outer concrete confined with polymer grid, and concrete cover. In this study, a total of 16 concrete stub columns were cast and tested under axial compression. Columns were divided into eight groups, which included one group of plain concrete columns, two groups of FRP confined concrete columns, and five groups of CCFT columns. For FRP confined concrete columns, one layer and two layers of carbon FRP (CFRP) sheet were wrapped, respectively. For CCFT columns, glass FRP (GFRP) tube was used to confine the inner concrete, and polymer grid was used to confine the outer concrete. The test results show that considerable increase in strength and ductility can be obtained for CCFT columns. An analytical model has been developed to predict the axial compressive behaviour of CCFT columns. The analytical results have been found to be in good agreement with the experimental results. Based on the analytical model, the influences of different parameters on the axial compressive behaviour of CCFT columns have been investigated through parametric analyses.

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

Cited by 118 publications

References 36 publications

Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns

Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns

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

Behaviour of concrete-encased concrete-filled FRP tube (CCFT) columns under axial compression

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