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

Wang, Wei Qiang; Sheikh, M. Neaz; Hadi, Muhammad N.S.; Gao, Danying; Chen, Gang

doi:10.1016/j.engstruct.2017.05.061

Cited by 45 publications

(11 citation statements)

References 42 publications

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“…Results indicated that significant increase in strength and ductility of concrete can be achieved by FRP composite jackets. Wang et al [14] conducted 16 FRP confined concrete stub column and found that by increasing the concrete strength, the peak load of column can be increased. Vincent et al [15] investigated the effect of fiber angle on axial compressive behavior of circular FRP confined concrete.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Composite Concrete Columns with Encased FRP Confined Concrete Cores

Wang

Yao

Yangshan

et al. 2019

Sensors

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A composite concrete column with encased fiber reinforced polymer (FRP) confined concrete cores (EFCCC) is proposed in this paper. The cross-sectional form of the EFCCC column is composed of several orderly arranged FRP confined concrete cores (FCCCs) surrounding a filled core concrete. This novel composite column has several advantages, such as higher compressive capacity, stronger FRP confinement, and ductile response. The compressive experiment is employed to investigate the compressive behavior of the EFCCC column with deferent parameters, such as outside concrete and stirrups. Test results show that the main failure mode of the EFCCC column with and without an outside concrete or stirrups is tensile fracture of the glass fiber reinforced polymer (GFRP) tubes. Compared to a reinforced concrete (RC) column, the strength and ductility of the EFCCC column was obviously improved by 20% and 500%, respectively. A finite element model (FEM) based on the Drucker–Prager (D-P) was developed that can accurately predict the axial compression behavior of the composite column with FRP confined concrete core. The predicted results obtained by using this FEM have excellent agreement with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Composite Concrete Columns with Encased FRP Confined Concrete Cores

Wang

Yao

Yangshan

et al. 2019

Sensors

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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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“…Several experimental studies have proven that FRP wrapping of RC columns is an effective means of enhancing their strength and ductility as it provides confinement to the concrete core (Ozbakkaloglu and Oehlers, 2008;Moshiri et al, 2015;Vincent and Ozbakkaloglu, 2014;Mirmiran et al, 1998;Pessiki et al, 2001;Chaallal et al, 2003;Chaallal et al, 2000;Sezen and Miller, 2011;Ilki et al, 2008;Alecci et al, 2014;Ilki and Kumbasar, 2003;Wang et al, 2017;Sheikh et al, 2007;Silva and Rodrigues, 2006;Cui and Sheikh, 2010b;Masia et al, 2004;Lam and Teng, 2004;Matthys, 2000;Parghi and Alam, 2018).…”

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confidence: 99%

Experimental studies and theoretical models for concrete columns confined with FRP composites: a review

Gora

Jaganathan

Amwar

et al. 2019

WJE

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Purpose Advanced fibre-reinforced polymer (FRP) composites have been increasingly used over the past two decades for strengthening, upgrading and restoring degraded civil engineering infrastructure. Substantial experimental investigations have been conducted in recent years to understand the compressive behaviour of FRP-confined concrete columns. A considerable number of confinement models to predict the compressive behaviour of FRP-strengthened concrete columns have been developed from the results of these experimental investigations. The purpose of this paper is to present a comprehensive review of experimental investigations and theoretical models of circular and non-circular concrete columns confined with FRP reinforcement. Design/methodology/approach The paper reviews previous experimental test results on circular and non-circular concrete columns confined with FRP reinforcement under concentric and eccentric loading conditions and highlights the behaviour and mechanics of FRP confinement in these columns. The paper also reviews existing confinement models for concrete columns confined with FRP composites in both circular and non-circular sections. Findings This paper demonstrates that the performance and effectiveness of FRP confinement in concrete columns have been extensively investigated and proven effective in enhancing the structural performance and ductility of strengthened columns. The strength and ductility enhancement depend on the number of FRP layers, concrete compressive strength, corner radius for non-circular columns and intensity of load eccentricity for eccentrically loaded columns. The impact of existing theoretical models and directions for future research are also presented. Originality/value Potential researchers will gain insight into existing experimental and theoretical studies and future research directions.

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

Cited by 45 publications

References 42 publications

Compressive Behavior of Composite Concrete Columns with Encased FRP Confined Concrete Cores

Compressive Behavior of Composite Concrete Columns with Encased FRP Confined Concrete Cores

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

Experimental studies and theoretical models for concrete columns confined with FRP composites: a review

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