Axial compressive behaviour of GFRP tube reinforced concrete columns

Construction and Building Materials

Al-Baali

et al. 2018

Self Cite

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.

Section: Introductionmentioning

confidence: 99%

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

Wang

Construction and Building Materials

Al-Baali

et al. 2018

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“…Over the last three decades extensive studies have been conducted on the confinement of concrete columns with FRP sheets [19][20][21][22][23][24][25][26][27][28][29]. The experimental results revealed that confining concrete columns with FRP sheets can considerably improve the strength and ductility of concrete columns.…”

Section: Introductionmentioning

confidence: 99%

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

Karim

Construction and Building Materials

Hadi

2016

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121

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.

“…Recently, Wang et al [24] and Hadi et al [25] proposed a new reinforcing scheme named FRP tube reinforced concrete columns in which perforated Glass Fibre Reinforced Polymer (GFRP) tubes…”

Section: Introductionmentioning

confidence: 99%

Behaviour of perforated GFRP tubes under axial compression

Wang

Hadi

2015

Thin-Walled Structures

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This study investigates the influences of various parameters on the behaviour of perforated Glass Fibre Reinforced Polymer (GFRP) tubes under axial compression. A total of 15 GFRP tubes with and without perforations were tested under axial compression. All the GFRP tubes were divided into two groups: 12 tubes with 89 mm outer diameter and 6 mm wall thickness and 3 tubes with 183 mm outer diameter and 8 mm wall thickness. The influences of hole diameter, vertical hole spacing, tube diameter, perforation pattern, transverse hole spacing, and hole reinforcement on the axial compressive behaviour of perforated GFRP tubes were experimentally investigated. Considerable decreases in the axial stiffness, axial critical load, and axial deformation capacity of perforated GFRP tubes have been observed. The hole diameter, tube diameter, perforation pattern, and transverse hole spacing significantly influence the axial compressive behaviour of perforated GFRP tubes. However, the influences of vertical hole spacing and hole reinforcement have been observed not significant. Design-oriented equations for the prediction of the axial stiffness, axial critical load and axial deformation capacity of perforated GFRP tubes under axial compression have been proposed. The proposed equations have been found to be in good agreement with experimental results and can be used for the reliable design of perforated GFRP tubes. Disciplines Engineering | Science and Technology Studies -------------------------------------------------------- Research Highlights 53Perforated GFRP tubes with multiple holes have been tested under axial compression. 54Influences of different parameters on behaviour of perforated GFRP are investigated. 55Design equations are developed to predict the capacity of perforated GFRP tubes.