Behaviour of hollow core square reinforced concrete columns wrapped with CFRP with different fibre orientations

Hadi, Muhammad N.S.; Le, Tan D.

doi:10.1016/j.conbuildmat.2013.08.080

Cited by 43 publications

(29 citation statements)

References 29 publications

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“…Hollow concrete columns (HCCs) are one of the preferred construction systems in civil infrastructures-including bridge piers, ground piles, and utility poles-to minimize the overall weight and reduce costs given the small amount of concrete in the column itself and the underlying foundations. HCCs are also considered a practical solution to increase the strengthto-mass ratio of structures compared to the solid concrete columns (Lignola, et al, 2007, Kusumawardaningsih and Hadi, 2010, Hadi and Le, 2014, Lee, et al, 2015. Designing an HCC with sufficient strength and reliable structural performance, however, requires careful consideration of some critical parameters, including lateral-reinforcement details and concrete compressive strength (Zahn, et al, 1990, Mo, et al, 2003, Lignola, et al, 2007, Lee, et al, 2015, Liang, et al, 2015.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Therefore, the confinement provided by FRP are achieved mainly when the column is loaded concentrically or when the load eccentricity is small (Li and Hadi 2003;Hadi 2006b;Hadi 2006a;Hadi 2007;Bisby and Ranger 2010). However, attaching FRP straps longitudinally on the columns enhances the flexural strength of columns under eccentric loading (Chaallal and Shahawy 2000;Hadi 2007;Fitzwilliam and Bisby 2010;Hadi and Widiarsa 2012;Hadi and Le 2014).…”

Section: Introductionmentioning

confidence: 99%

Behavior of Circularized Hollow RC Columns under Different Loading Conditions

2017

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One of the methods for strengthening square concrete columns is shape modification. The method involves modification of the column cross section from square to circular by bonding concrete segments and then wrapping the column with fiber reinforced polymer (FRP). This paper investigates experimentally the applicability of the shape modification (circularization) for square hollow reinforced concrete (RC) specimens under different loading conditions. Five groups of four hollow RC specimens made from normal strength concrete were cast and tested. The specimens in the first group were RC hollow specimens, which served as reference specimens. The corners of the specimens in the second group were rounded to 20 mm and wrapped with two layers of carbon FRP (CFRP). The specimens in the third group were circularized and wrapped with two layers of CFRP. The specimens in the fourth group were bonded with one CFRP strap longitudinally on each side and then circularized and wrapped with two layers of CFRP. The specimens in the fifth group were wrapped with one layer of CFRP and then circularized and wrapped with two layers of CFRP. The results show that circularization increased the strength and ductility of the hollow specimen. Transverse wrapping with CFRP mainly improved the performance of the specimens under concentric axial loadings, while the longitudinal CFRP straps mainly improved the performance of the specimens under eccentric axial loading.

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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

Sheikh

Hadi

2016

Construction and Building Materials

121

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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.

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Behaviour of hollow core square reinforced concrete columns wrapped with CFRP with different fibre orientations

Cited by 43 publications

References 29 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

Behavior of Circularized Hollow RC Columns under Different Loading Conditions

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

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