Compressive Behaviour of RC Column with Fibre Reinforced Concrete Confined by CFRP Strips

Vasumathi, A. M.; Rajkumar, K.; Prabhu, G. Ganesh

doi:10.1155/2014/601915

Cited by 25 publications

(10 citation statements)

References 35 publications

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“…Of the six specimens excluding the reference column, three columns were externally confined by 50 mm width CFRP strips having a spacing of 20 mm, and the remaining three columns were confined with the spacing of 40 mm using 50 mm width CFRP strips. The specimen fabrication procedure followed in this study was very similar to the procedure followed in [55]. For concrete mixtures, cement and aggregates were weighed in dry condition and mixed together in a 30-litre omni mixer for 60 seconds.…”

Section: Specimen Fabricationmentioning

confidence: 99%

Performance Analysis of CFRP Composite Strips Confined RC Columns under Axial Compression

Murugadoss

Lee²,

Bang

et al. 2015

Advances in Materials Science and Engineering

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In an attempt to mitigate the high cost of FRP composite strengthening, an experimental investigation was carried out that sought to achieve efficient and most favorable FRP strengthening using CFRP composite strips. 50 mm wide CFRP composite strips were used in two different spacings (20 mm and 40 mm) to confine columns. The test results of the column confined with smaller spacing (20 mm) showed significant restraint of axial deformation of the column and enhanced the strength capacity to a maximum of 99.20% compared to that of reference column. In contrast, the column confined by strips with larger spacing (40 mm) failed by crushing of concrete alone, which occurred even before the CFRP strips reached their ultimate strain. In addition, the embodied energy that exists in the CFRP strips could not be utilized effectively. The stress and strength enhancement ratio of this present study was compared with the previous research that has been conducted on columns confined with full wrapping. From the obtained results, it is recommended that CFRP strips with a spacing of 20 mm be used to improve the strength capacity of the RC column; in addition, this wrapping technique provides economic benefits compared to a column confined with full wrapping.

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Section: Specimen Fabricationmentioning

confidence: 99%

Performance Analysis of CFRP Composite Strips Confined RC Columns under Axial Compression

Murugadoss

Lee²,

Bang

et al. 2015

Advances in Materials Science and Engineering

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“…As an action, these structures are strengthened by designing armor to support the designed load, or to reinforcing the damaged frames through the maintenance of some of its parts. The use of jackets has become a common strengthening method to increase the strength of the concrete member or to repair damaged concrete members in concrete structures [2]. Concrete is considered one of the most important building materials widely used around the world due to its high resistance to high loads.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fibrous Jacket on Behavior of RC Columns

Jassim

Chassib

2020

Civ Eng J

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This paper presented an extensive study about the strengthening of RC square short columns with high strength concrete jackets reinforced with steel fiber. The aim of this study is to investigate the effect of confinement by fibrous jacket on the behavior of RC column. A comparative study is performed on 23 square columns (six of them were unconfined columns where the remaining seventeen were confined columns) with varied parameters such as steel fibers ratio and type, jacket thickness, partial and full strengthening, type of confining jacket (hoop and composite), use of epoxy as bond material between the concrete column and strengthening jacket, and length parameter. The test results showed that the strengthened columns showed a significant improvement in the ultimate stress, load-carrying capacity, maximum strain, ductility, and energy absorption. Increase the steel fibers ratio (1, 1.5 and 2%) increased the ultimate stress by (22.5, 12.3 and 12.5%) respectively. The use of epoxy as bond material enhanced the ultimate stress by an average improvement by (55%). Composite case in the strengthening enhanced the load-carrying capacity larger than hoop case by (28.7 and 42%) for FRC jackets with hooked and straight fibers respectively but in case of stress capacity, hoop jacket carries stresses more than composite according to the stressed cross-sectional area. Increase jacket thickness (25 and 35 mm) enhanced the ultimate stress by (28.7 and 15.5%) respectively. Partial strengthening has a good enhancement in the ultimate load but was less than full strengthening. Increase the length by (25 cm) decreased the enhancement in load capacity of the column with hoop jacket by (45.3%). Concrete jackets enhanced Energy absorption and ductility which improved the deformation capacity. The compressive behavior of stub concrete columns was also modeled, simulated, and analyzed numerically by a 3D nonlinear finite element model. The verification process was performed against the reported data of the experimental test which proved the results of experimental results and showed a good agreement between experimental and numerical outcomes.

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“…A construction method for strengthening aging-reinforced concrete buildings against earthquakes by wrapping structural members with carbon fiber sheets (CF sheets) has been proposed and implemented in recent years [1][2][3][4]. It was conventionally believed that seismic reinforcement using CF sheet jackets (CF reinforcement) is applicable to beam and column members with circular [5,6] or nearly square [7][8][9] cross sections and beam-column connections [10].…”

Section: Introductionmentioning

confidence: 99%

Fundamental Investigation on Seismic Retrofitting Method of Aging Concrete Structural Wall Using Carbon Fiber Sheet‐Constitutive Law of Rectangular Section

Hayashi

Matsui

Saito

et al. 2020

Advances in Materials Science and Engineering

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Aging building structure has become a world problem. This problem is particularly serious in developing and underdeveloped countries. The multihazard resilience and sustainability (e.g., seismic performance) decrease at the aging building. A construction method for strengthening aging-reinforced concrete buildings by wrapping structural members with carbon fiber sheets has been proposed and implemented in recent years. Authors aim to develop a seismic retrofitting method of aging concrete structural wall with a rectangular cross section using carbon fiber sheets. In this paper, authors examined the stress-strain relationship of concrete elements with rectangular cross sections reinforced by wrapping with carbon fiber sheets. Monotonic uniaxial compression tests were performed on 21 specimens using the ratio of the long side to the short side and the ratio of the element height to the short side of the concrete cross section, the weight of the carbon fiber sheet, and the chamfer radius of section corners as variables. The tests revealed that (1) the compressive strength decreases and ultimate strain increases as the ratio of the long to short side (longitudinal ratio) of the cross section increases even in a range the ratio exceeds 2 and (2) the ratio of the element height to the short side does not significantly affect the stress-strain relationship. Furthermore, authors proposed evaluation formulas for the constitutive law of concrete elements with rectangular cross sections including the longitudinal ratio which exceeds 2 reinforced by carbon fiber sheets and confirmed that the formulas can reproduce the test results with good accuracy.

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Compressive Behaviour of RC Column with Fibre Reinforced Concrete Confined by CFRP Strips

Cited by 25 publications

References 35 publications

Performance Analysis of CFRP Composite Strips Confined RC Columns under Axial Compression

Performance Analysis of CFRP Composite Strips Confined RC Columns under Axial Compression

Effect of Fibrous Jacket on Behavior of RC Columns

Fundamental Investigation on Seismic Retrofitting Method of Aging Concrete Structural Wall Using Carbon Fiber Sheet‐Constitutive Law of Rectangular Section

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