Axial and flexural behavior of unreinforced and FRP bar reinforced circular concrete filled FRP tube columns

Abstract

Sheikh, M. Neaz. (2016). Axial and flexural behavior of unreinforced and FRP bar reinforced circular concrete filled FRP tube columns. Construction and Building Materials, 122 (September), 43-53. Axial and flexural behavior of unreinforced and FRP bar reinforced circular concrete filled FRP tube columns AbstractFiber Reinforced Polymer (FRP) composites have emerged as a viable alternative of steel reinforcement due to higher ultimate tensile strength to weight ratio and corrosion resistance of FRP composites. Concrete Filled Fiber Reinforced Polymer Tube (CFFT) technique for new column construction has attracted significant research attention. This paper investigated the axial and flexural behavior of concrete filled Carbon FRP (CFRP) tube columns with and without CFRP bar and concrete filled Glass FRP (GFRP) tube columns with and without GFRP bar. The test results of 16 circular CFFT and four steel Reinforced Concrete (RC) specimens of 203-205 mm diameter and 800-812 mm height have been reported in this paper. The test results showed a larger reduction in the confinement effectiveness of FRP tube than steel helices under increasing applied load eccentricity. FRP bar reinforced CFFT specimens exhibited higher axial loads, flexural loads, and deformations at peak loads than unreinforced CFFT and steel RC specimens. Experimental axial loadbending moment interaction curves of tested specimens also showed the improved performance of FRP bar reinforced CFFT specimens. --------------------------------------------------------

Axial and flexural behaviour of circular reinforced concrete columns strengthened with reactive powder concrete jacket and fibre reinforced polymer wrapping

“…The δ y was determined by the intersection point of two straight lines. The first straight line is the best-fit regression line to the linear segment of the load-deformation curve and the second line is a horizontal straight line passing through the ultimate load [37].…”

Concrete Filled Carbon FRP Tube (CFRP-CFFT) columns with and without CFRP reinforcing bars: Axial-flexural interactions

“…As part of the large experimental research program, 12 steel RC and CFRP-CFFT specimens of 204 -205 mm outer diameter and -812 mm height were tested under concentric axial load, 25 mm and 50 mm eccentric axial loads and four-point load. The details of the failure modes, load-deformation behavior of the tested specimens, illustration of test set-ups and test results of specimens were presented in Hadi et al [1]. A brief description of the experimental procedure and results has been presented herein for completeness.…”

“…One of the solutions to reduce deterioration in the strength and ductility of steel RC structural members is to use Fiber Reinforced Polymer (FRP) reinforcement in lieu of steel reinforcement. FRP reinforcement has several advantages over steel reinforcement such as higher corrosion resistance, higher strength to weight ratio and superior durability in aggressive environment [1].…”

“…The axial and flexural behaviors of CFFT have received considerable research attention in the last two decades. Experimental investigations demonstrated that circular CFFT specimens tested under axial compressive loads exhibited increased confined concrete strength and ductility due to higher confinement provided by the FRP tube compared to the confinement provided by the steel helix in conventional steel bar RC specimens [1]; [3][4][5][6][7][8][9][10][11][12][13][14]. A limited number of experimental studies, however, investigated the flexural behavior of CFFT specimens.…”

Axial compressive behaviour of circular CFFT: Experimental database and design-oriented model

“…It also serves as a formwork and prevents ingress of harmful chlorides and salts, and hence slows down the deterioration in the strength and ductility of concrete columns (Lillistone and Jolly 2000). The influence of different aspects of circular CFFT columns including tube thickness, diameter of the tube, tube height to diameter ratio, unconfined concrete strength, cross sectional shape, orientation of fibres, fibre type, tube manufacturing method, specimen end condition and loading (Axial, flexural and seismic) conditions on the strength and strain enhancement ratios of CFFT columns were investigated by Jolly (1997, 2000), Mastrapa (1997), Jolly and Lillistone (1998a, b), Samaan et al (1998), Matthys et al (1999), Saafi et al (1999), Tegola and Manni (1999), Rizkalla (2001a, b, 2002), Harries and Carey (2002), Hong and Kim (2004), Cole and Fam (2006), Ozbakkaloglu and Saatcioglu (2006), Li and Ou (2007), Mohamed and Masmoudi (2008a, b), Ozbakkaloglu and Oehlers (2008a), Park et al (2011), Ozbakkaloglu (2013a, Ozbakkaloglu and Vincent (2013), Idris and Ozbakkaloglu (2013), Vincent and Ozbakkaloglu (2013a, b), Hadi et al (2015Hadi et al ( , 2016.…”