Experimental Study on FRP Tube Reinforced Concrete Columns under Different Loading Conditions

Wang, Wei Qiang; Sheikh, M. Neaz; Hadi, Muhammad N.S.

doi:10.1061/(asce)cc.1943-5614.0000690

Cited by 27 publications

(10 citation statements)

References 30 publications

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“…This can be explained that for concrete confined by very thick FRP tubes, the contribution of axial load by the FPR tube is more significant than the gain from the confinement of concrete. Similar observation has also been reported by Wang et al[61] and Fam et al[62].5.5. Influence of amount of polymer gridThe influence of the amount of polymer grid has been investigated by changing the number of polymer grid layers (1 layer, 2 layers, 3 layers, and 4 layers).…”

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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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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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“…Due to the advantages of high strength and stiffness to weight ratios as well as superior corrosion resistance, fibre reinforced polymer (FRP) has been extensively used in recent years to improve the compressive, flexural, and shear behaviours of concrete members [1][2][3][4][5][6]. One popular application of FRP is to provide confinement to concrete columns [7][8][9][10][11][12][13][14][15]. Both experimental and analytical studies have proven that the FRP confinement can enhance the strength and ductility of concrete under compressive loadings.…”

Section: Introductionmentioning

confidence: 99%

Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models

Wang

Sheikh

Al-Baali

et al. 2018

Construction and Building Materials

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This study provides new insight on the compressive behaviour of partially fibre reinforced polymer (FRP) confined concrete with either strain-hardening or strain-softening responses. Fully FRP confined concrete, partially FRP confined concrete with different strip gaps, and unconfined concrete were tested under axial compression. Four types of axial load-axial deformation behaviours were observed for specimens with different strip gaps. Even though a high volumetric ratio of FRP was applied, the confinement effectiveness was negligible when the strip gap exceeded the diameter of the specimens. Moreover, the axial stress-axial strain behaviours of wrapped and non-wrapped concrete were observed to be different, and significant strain localization was observed within the non-wrapped region. Based on the experimental observations and an extensive literature review, a confinement effectiveness coefficient was proposed for partially FRP confined concrete. A stress-strain model was then developed by considering the proposed confinement effectiveness coefficient. The developed stress-strain model provided better predictions than other existing stress-strain models.

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“…The coupons were capped at both ends by aluminum plates. Detailed description of the test can be found in Wang et al (2016). The average nominal thickness of the coupons was 1.18 mm, and the average tensile strength of CFRP was 1674 MPa with an average ultimate strain of 0.016.…”

Section: Specimen Preparation and Materials Properties Testmentioning

confidence: 99%

“…In this section, a numerical fiber element method was used to construct the analytical interaction diagrams of concrete specimens (Fam et al 2003;Yazici and Hadi 2009;Wang et al 2016). The cross section of concrete specimens was divided into a finite number of small horizontal strips, as shown in Fig.…”

Section: Analytical Interaction (P-m) Diagrammentioning

confidence: 99%

“…A large number of experimental and analytical studies were conducted in the literature to understand and model the compressive behavior of FRP confined concrete. It was proved that FRP confinement can significantly enhance the performance of concrete under compressive loads (Lam and Teng 2003a, b;Hadi 2006a, b;Hadi et al 2015;Wang et al 2016;Wang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Eccentrically Loaded FRP Confined Concrete with Different Wrapping Schemes

et al. 2018

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This study presents the results of an experimental program on the comparative performance of fiberreinforced polymer (FRP) confined concrete specimens with different wrapping schemes. A total of 32 specimens in four groups were cast and tested under concentric and eccentric axial loads. All specimens were wrapped with the same amount of FRP but with different wrapping schemes, including full wrapping, partial wrapping, and nonuniform wrapping. Specimens in the first group were fully wrapped (Group F). Specimens in the second group were partially wrapped with 30 mm FRP strip spacing (Group P30). Specimens in the third group were partially wrapped with 60 mm FRP strip spacing (Group P60). Specimens in the fourth group were nonuniformly wrapped with a combination of full and partial wrapping (Group FP). Two similar specimens in each group were tested under concentric, 15 mm eccentric, 25 mm eccentric, and 40 mm eccentric axial loads. The test results indicate that fully wrapped specimens outperformed other groups of specimens under both concentric and eccentric axial loads, which were followed by nonuniformly and partially wrapped specimens. With the increase in axial load eccentricity, the performance in all groups significantly decreased. Moreover, with the increase in axial load eccentricity, the failure mode changed from FRP rupture at the compression side to extensive concrete cracking at the tension side. Equations were developed to predict the compressive strength of FRP confined concrete with different wrapping schemes. Experimental and analytical interaction (P-M) diagrams were also constructed to investigate the axial and flexural behavior of different groups of specimens.

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Experimental Study on FRP Tube Reinforced Concrete Columns under Different Loading Conditions

Cited by 27 publications

References 30 publications

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

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

Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models

Eccentrically Loaded FRP Confined Concrete with Different Wrapping Schemes

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