Comparative behaviour of hollow columns confined with FRP composites

Kusumawardaningsih, Yuliarti; Hadi, Muhammad N.S.

doi:10.1016/j.compstruct.2010.05.020

Cited by 76 publications

(47 citation statements)

References 18 publications

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“…The high confinement pressure at the corners causes premature failure of FRP due to stress concentrations. Similar to solid columns, wrapping the circular hollow columns results better enhancement in strength and ductility than the non-circular hollow columns (Yeh and Mo 2005;Kusumawardaningsih and Hadi 2010).…”

Section: Introductionmentioning

confidence: 98%

“…It is well known that wrapping FRP transversely provides higher level of confinement in circular columns than non-circular columns (Rochette and Labossiere 2000;Harries and Carey 2003;Kusumawardaningsih and Hadi 2010;Silva 2011;Faustino et al 2014;Colajanni et al 2014). The higher confinement for circular column than non-circular column is due to the uniform distribution of confinement pressure around the circular cross-section.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Behavior of Circularized Hollow RC Columns under Different Loading Conditions

2017

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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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“…Recently, external bonding with carbon fibrereinforced polymer (CFRP) materials has been an attractive choice attributed to the high strength-to-weight ratio, excellent resistance to fatigue and corrosion damage as well as ease of installation. Confining concrete with CFRP is proven effective to enhance both the strength and ductility of the material and extensive research has been performed to investigate the strength model as well as the stress-strain behaviour of CFRP confined concrete in the last two decades [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Durability of concrete with CFRP wrapping

2018

MATEC Web Conf.

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Carbon fibre-reinforced polymer (CFRP) material has a high strength-to-weight ratio and good resistance to corrosion and environmental attacks. It has been widely used in rehabilitation of aged infrastructure. However, the durability of the strengthened system has not been yet assessed thoroughly since most of the previous study was conducted based on accelerated tests while the long-term investigation was less reported. This paper investigated the effect of CFRP wrapping on the axial behaviour of concrete cylinders subjected to different environments for more than 13 years. The specimens were exposed to five different conditions, including standard curing, immersion in distilled water, immersion in saturated Na2SO4 solution, outdoor sheltered from the rain, and outdoor without shelter from the rain. Axial compression tests were performed on the wrapped concrete cylinders. The load-bearing capacity and stress-strain responses were recorded. It was found that CFRP wrapping could effectively improve the ultimate strength and ductility of the columns. Though scatter existed, no significant effect of the environmental exposure on the load-bearing capacity of the cylinder specimens was observed which indicates a good durability of the strengthening system.

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Comparative behaviour of hollow columns confined with FRP composites

Cited by 76 publications

References 18 publications

Behavior of Circularized Hollow RC Columns under Different Loading Conditions

Behavior of Circularized Hollow RC Columns under Different Loading Conditions

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

Durability of concrete with CFRP wrapping

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