Experimental and analytical behavior of short concrete columns reinforced with GFRP bars under eccentric loading

Khorramian, Koosha; Sadeghian, Pedram

doi:10.1016/j.engstruct.2017.08.064

Cited by 88 publications

(28 citation statements)

References 17 publications

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“…In recent years, there is an increased interest in the use of GFRP bars as longitudinal reinforcement for concrete columns. A number of studies have shown the effectiveness of using GFRP bars for solid and hollow concrete columns [2][3][4][31][32][33][34]. These studies emphasised the linear elastic response until failure of the GFRP bars as internal reinforcement in concrete columns.…”

Section: Introductionmentioning

confidence: 99%

Novel testing and characterization of GFRP bars in compression

Alajarmeh

Manalo

Benmokrane

et al. 2019

Construction and Building Materials

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Glass fibre reinforced polymer (GFRP) bars have now been increasingly used as longitudinal reinforcement in concrete columns. In column design and analysis, the contribution of GFRP bars to compression is often ignored or is estimated as a fraction of its tensile strength due to the limited understanding on their compressive behaviour. Moreover, there exists no standard test method to characterise the properties of GFRP bars in compression. This study implemented a novel test method to determine and characterise the compressive properties of high modulus GFRP bars. During the preparation of test specimens, hollow steel caps filled with cementitious grout were used to confine the top and bottom ends of the GFRP bars. The effects of the bar diameter (9.5, 15.9, and 19.1 mm) and the unbraced length-to-bar diameter ratio, ⁄ (2, 4, 8, and 16) were investigated on the compressive strength of the bars. The results showed that the increase in bar diameter increases the micro-fibre buckling and decreases the compressive-to-tensile strength ratio. Similarly, the failure mode changed from crushing to fibre buckling with the increase of ⁄ ratio. Simplified theoretical equations were proposed to reliably describe the compressive behaviour of GFRP bars with different bar diameters and ⁄ ratios.

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Section: Introductionmentioning

confidence: 99%

Novel testing and characterization of GFRP bars in compression

Alajarmeh

Manalo

Benmokrane

et al. 2019

Construction and Building Materials

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“…The previously suggested models for the axial strength of columns reinforced with FRP rebars have deficiencies such as they were suggested based on small data points, the axial contribution of FRP rebars was not included in the axial compressive performance and bending performance and the compressive and tensile properties of FRP rebars were assumed to be the same. The axial strength (AS) is significantly improved by improving the lateral confinement of the concrete core but the steel reinforcement performs better than FRP reinforcement in compressive members after increasing the lateral confinement of the core [26][27][28]. The predictions are underestimated by neglecting the axial influence of FRP bars in columns while the predictions portray a close agreement with the experimental outcomes by considering the influences of AS and axial stiffness of FRP rebars [17,[29][30][31].…”

Section: Introductionmentioning

confidence: 83%

Strength Profile Pattern of FRP-Reinforced Concrete Structures: A Performance Analysis through Finite Element Analysis and Empirical Modeling Technique

Raza

Shah²,

Alhazmi

et al. 2021

Polymers

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Limited research work is available in the literature for the theoretical estimates of axial compressive strength of columns reinforced with fiber reinforced polymer (FRP) rebars. In the present work, an experimental database of 278 FRP-reinforced concrete (RC) compression members was established from the literature to recommend an empirical model that can accurately predict the axial strength (AS) of GFRP-RC specimens. An initial assessment of 13 different previously anticipated empirical models was executed to achieve a general form of the AS model. Finally, a new empirical equation for forecasting the AS of GFRP-RC short columns was proposed using the curve fitting and regression analysis technique. The performance of the proposed empirical model over the previous experimental database represented its higher accuracy as related to that of other models. For the further justification of the anticipated model, a numerical model of GFRP-RC columns was simulated using ABAQUS and a wide parametric study of 600 GFRP-RC samples was executed to generate a numerical database and investigate the influence of various parameters using numerical and empirical models. The comparison between theoretical and numerical predictions with R2 = 0.77 indicted that the anticipated empirical model is accurate enough to apprehend the AS of FRP-RC specimens.

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“…Moreover, the Canadian guideline for design and construction of building structures with FRP [2] allows the use of GFRP bars in concentrically loaded columns if their contribution in the strength of the column is neglected. Despite of the limitations, recent studies have shown that neglecting the contribution of compressive GFRP bars in concrete columns is conservative [3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The authors' research group attempted testing GFRP bars in compression [5,4] and later presented a preliminary report [16] on the test method. The current paper expands the research to a detailed test method and a comprehensive research program with a total of 35 test specimens with three different bar types from three different manufacturers.…”

Section: Introductionmentioning

confidence: 99%

Material Characterization of GFRP Bars in Compression Using a New Test Method

Khorramian

Sadeghian

2021

Journal of Testing and Evaluation

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This paper presents a new test method for determining the mechanical properties of glass fiber-reinforced polymer (GFRP) composite bars in compression, namely the compressive strength, compressive modulus of elasticity, ultimate crushing strain, and compressive stress-strain curves of the bars. The contribution of GFRP bars in compression is currently neglected by major design guidelines related to GFRP-reinforced concrete columns. However, the demand for using GFRP bars is increasing since multiple researchers have shown the effectiveness of the bars in concrete columns. Thus, the need for characterization of the mechanical properties of GFRP bars is increasing, while there is no standardized test method to evaluate the compressive properties of these bars. Therefore, in this paper, a new test method is proposed for evaluating the compressive characteristics of GFRP bars. The proposed test method was examined through testing a total of 35 specimens. It was observed that the test method was able to evaluate the compressive characteristics of the GFRP bars successfully. Three different modes of compressive failure were observed which were related to the crushing of GFRP bars in different locations in the bar, but no premature failure or bar buckling was observed. Moreover, a comparison between tensile and compression characteristics of the GFRP bars showed that the tensile test results is not sufficient to estimate the compressive characteristics and performing compression test is necessary.

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Experimental and analytical behavior of short concrete columns reinforced with GFRP bars under eccentric loading

Cited by 88 publications

References 17 publications

Novel testing and characterization of GFRP bars in compression

Novel testing and characterization of GFRP bars in compression

Strength Profile Pattern of FRP-Reinforced Concrete Structures: A Performance Analysis through Finite Element Analysis and Empirical Modeling Technique

Material Characterization of GFRP Bars in Compression Using a New Test Method

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