Behaviour of reinforced concrete rectangular columns strengthened using GFRP

Kumutha, R; Vaidyanathan, Ragavan; Palanichamy, M. S.

doi:10.1016/j.cemconcomp.2007.03.009

Cited by 141 publications

(48 citation statements)

References 5 publications

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“…14 shows a comparison between the test results from this work and the theoretical predictions of models reported in the literature [10,13,17,24,[27][28][29][30][31][32]. The figure shows that all of the existing models predict a decrease in the strength gain f cc /f co as the aspect ratio increases.…”

Section: Strength Modelingmentioning

confidence: 54%

“…The test results also showed that CFRP jackets were more effective in enhancing the strength and deformability where the concrete strength was low. The behavior of RC rectangular columns strengthened by GFRP was investigated by Kumutha et al [17], who examined the variation in the number of GFRP layers and the aspect ratio. They found that the use of GFRP produced an increase in strength, but that the phenomenon was strongly influenced by the aspect ratio of the cross-section, with an increasing aspect ratio leading to a decrease in ultimate strength.…”

Section: Introductionmentioning

confidence: 99%

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Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns

Wu¹,

Wei²

2010

Engineering Structures

297

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Section: Strength Modelingmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns

Wu¹,

Wei²

2010

Engineering Structures

297

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“…Several investigations on FRP-strengthened concrete columns have been undertaken over the years. Most of these studies investigated the behavior of columns under concentric loads (Kumutha et al 2007;Wang and Wu 2008;Lam and Teng 2002;Teng and Lam 2004;Rousakis et al 2007), whereas only a few studies presented investigations of columns under eccentric loads. Consideration of applying eccentric loads was undertaken due to the reality that most columns in the field are loaded under a combination of axial compression load and bending moment.…”

Section: Introductionmentioning

confidence: 99%

Axial and Flexural Performance of Square RC Columns Wrapped with CFRP under Eccentric Loading

2012

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The majority of studies on fiber-reinforced-polymer (FRP) strengthened concrete columns deal with columns of a circular cross section. However, most concrete columns in the field have square or rectangular cross sections and resist eccentric loads. This paper presents the results of an experimental study on the performance of carbon-fiber-reinforced-polymer (CFRP) wrapped square reinforced concrete (RC) columns under eccentric loading. The influence of the number of CFRP layers, the magnitude of eccentricity, and the presence of vertical CFRP straps were investigated by testing 16 specimens. The specimens had the dimensions 200 × 200 × 800 mm and round corners with a radius of 34 mm. Twelve specimens were tested as columns and four specimens as beams. The results of this study showed that CFRP wrapping enhanced the load-carrying capacity and ductility of the columns under eccentric loading. Furthermore, the application of the vertical CFRP straps significantly improved the performance of the columns with large eccentricity Abstract: The majority of studies on fiber-reinforced-polymer (FRP) strengthened concrete columns deal with columns of a circular cross section. However, most concrete columns in the field have square or rectangular cross sections and resist eccentric loads. This paper presents the results of an experimental study on the performance of carbon-fiber-reinforced-polymer (CFRP) wrapped square reinforced concrete (RC) columns under eccentric loading. The influence of the number of CFRP layers, the magnitude of eccentricity, and the presence of vertical CFRP straps were investigated by testing 16 specimens. The specimens had the dimensions 200 × 200 × 800 mm and round corners with a radius of 34 mm. Twelve specimens were tested as columns and four specimens as beams. The results of this study showed that CFRP wrapping enhanced the load-carrying capacity and ductility of the columns under eccentric loading. Furthermore, the application of the vertical CFRP straps significantly improved the performance of the columns with large eccentricity.

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“…Early research studies indicate that FRP-confined square or rectangular columns with sharp corners provide little enhancement on their load-carrying capacity (Wu & Zhou 2010). Some investigations on FRP strengthened reinforced concrete (RC) columns under concentric load (Kumutha et al 2007;Ilki et al 2008) have been reported. Furthermore, RC columns under eccentric load were tested to study the combination of compression and bending behaviour (Li & Hadi 2003;Hadi & Li 2004;Hadi 2006a;Hadi 2006b;Hadi 2007a;Hadi 2007b).…”

Section: Introductionmentioning

confidence: 99%

Effect of eccentric load on retrofitted reinforced concrete columns confined with FRP

Pham¹,

Xu²,

Hadi³

2012

From Materials to Structures: Advancement Through Innovation

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Different behaviour of diverse sections of confined Reinforced Concrete (RC) columns under eccentric load is investigated in this study. Three types of sections are considered, which include square columns, square with rounded corners and modified circular columns. Twelve reinforced square concrete columns were made from normal strength concrete and subdivided into four groups. The first three columns were the Reference Group and had no modification.The next three columns were modified with round corners and wrapped with three layers of Carbon Fibre Reinforced Polymer (CFRP), another three were bonded with four pieces of segmental circular concrete covers and wrapped with three layers of CFRP, and the last three were bonded with concrete covers and confined with steel straps. All columns were tested under concentric loading, 15 mm and 25 mm eccentric loading. Results from the study show that all confinement methods increase capacity and ductility of columns, in which segmental circular concrete covers considerably reduce the stress concentration on the corners and increase the efficiency of the confinement. Effect of eccentric load on the specimens wrapped with FRP is significantly higher than the Reference Group.

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Behaviour of reinforced concrete rectangular columns strengthened using GFRP

Cited by 141 publications

References 5 publications

Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns

Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns

Axial and Flexural Performance of Square RC Columns Wrapped with CFRP under Eccentric Loading

Effect of eccentric load on retrofitted reinforced concrete columns confined with FRP

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