Influence of fiber orientation and specimen end condition on axial compressive behavior of FRP-confined concrete

Vincent, Thomas; Ozbakkaloglu, Togay

doi:10.1016/j.conbuildmat.2013.05.085

Cited by 216 publications

(80 citation statements)

References 39 publications

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“…These factors include: (i) the differences in methods of measurement and test apparatus, and (ii) differences between FRP jackets and flat coupons caused by workmanship, geometric imperfections, residual strains, shrinkage incompatibility, non-uniform bond between concrete and FRP, curvature of the FRP jacket, multiaxial stress state in the FRP jacket. In addition to these, the strength of concrete and the elastic modulus of FRP material have recently been identified by the authors as two important material dependent factors [8,12,[16][17][18][19][20]. However, additional targeted investigations are required to gain a clearer insight into the influence of these factors on the hoop rupture strains of FRP jackets.…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing Hoop Rupture Strains of FRP-Confined Concrete

Lim

Ozbakkloglu

2014

AMM

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It is now well understood that the hoop rupture strain of fiber reinforced polymer (FRP) jackets confining concrete is often lower than the ultimate tensile strain of the component fibers. A number of reasons for the lower hoop rupture strains in FRP have been identified; however, the relationships between the material properties of FRP-confined concrete and hoop ruptures strains are yet to be established. This paper presents the results of an experimental study into the factors influencing the hoop strain efficiency of FRP jackets. 24 FRP-confined concrete specimens were tested under axial compression. The results indicate that the hoop rupture strains of FRP jackets decrease with either an increase in the strength of the unconfined concrete or the elastic modulus of the fiber material. These observations were verified by additional results from a large FRP-confined concrete test database assembled from the published literature.

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Section: Introductionmentioning

confidence: 99%

Factors Influencing Hoop Rupture Strains of FRP-Confined Concrete

Lim

Ozbakkloglu

2014

AMM

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“…Almost all of the circular CFFT column studies reported that for a given nominal or actual confinement ratio, increase in unconfined concrete strength resulted in significant decrease in the strength and strain enhancement ratios of circular CFFT columns. Hence, more confinement reinforcement is required to sufficiently confine the circular CFFT columns constructed with HSC and UHSC than columns constructed with NSC to develop equivalent confinement pressures (Ozbakkaloglu 2013b, Vincent andOzbakkaloglu 2013a). The unconfined concrete strength also has an inverse relationship to actual confinement ratio given by Eq.…”

Section: Unconfined Concrete Strengthmentioning

confidence: 99%

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

Khan¹,

Sheikh²,

Hadi³

2016

Steel Compos. Struct.

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Concrete Filled Fibre Reinforced Polymer Tube (CFFT) for new columns construction has attracted significant research attention in recent years. The CFFT acts as a formwork for new columns and a barrier to corrosion accelerating agents. It significantly increases both the strength capacity (Strength enhancement ratio) and the ductility (Strain enhancement ratio) of reinforced concrete columns. In this study, based on predefined selection criteria, experimental investigation results of 134 circular CFFT columns under axial compression have been compiled and analysed from 599 CFFT specimens available in the literature. It has been observed that actual confinement ratio (expressed as a function of material properties of fibres, diameter of CFFT and compressive strength of concrete) has significant influence on the strength and ductility of circular CFFT columns. Design oriented models have been proposed to compute the strength and strain enhancement ratios of circular CFFT columns. The proposed strength and strain enhancement ratio models have significantly reduced Average Absolute Error (AAE), Mean Square Error (MSE), Relative Standard Error of Estimate (RSEE) and Standard Deviation (SD) as compared to other available strength and strain enhancement ratios of circular CFFT column models. The predictions of the proposed strength and strain enhancement ratio models match well with the experimental strength and strain enhancement ratios investigation results in the compiled database. (Received April 21, 2016, Revised June 22, 2016, Accepted June 23, 2016 Abstract. Concrete Filled Fibre Reinforced Polymer Tube (CFFT) for new columns construction has attracted significant research attention in recent years. The CFFT acts as a formwork for new columns and a barrier to corrosion accelerating agents. It significantly increases both the strength capacity (Strength enhancement ratio) and the ductility (Strain enhancement ratio) of reinforced concrete columns. In this study, based on predefined selection criteria, experimental investigation results of 134 circular CFFT columns under axial compression have been compiled and analysed from 599 CFFT specimens available in the literature. It has been observed that actual confinement ratio (expressed as a function of material properties of fibres, diameter of CFFT and compressive strength of concrete) has significant influence on the strength and ductility of circular CFFT columns. Design oriented models have been proposed to compute the strength and strain enhancement ratios of circular CFFT columns. The proposed strength and strain enhancement ratio models have significantly reduced Average Absolute Error (AAE), Mean Square Error (MSE), Relative Standard Error of Estimate (RSEE) and Standard Deviation (SD) as compared to other available strength and strain enhancement ratios of circular CFFT column models. The predictions of the proposed strength and strain enhancement ratio models match well with the experimental strength and strain enhancement ratios investigation res...

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“…The majority of early experimental studies focused on FRP-wrapped concrete columns (e.g., [12,13]), with fewer studies reported on concrete-filled FRP tubes (CFFTs). Initial experimental studies on CFFTs (e.g., [14,15]) along with more recent extensive studies on the axial compressive (e.g., [5,[16][17][18][19][20]) and seismic behavior of CFFT columns (e.g., [21][22][23][24][25][26]) have demonstrated the ability of CFFTs to develop very high inelastic deformation capacities, making them an attractive option for construction of new highperformance columns.…”

Section: Introductionmentioning

confidence: 99%

“…External confinement of concrete with fiber reinforced polymer (FRP) composites has become widely accepted as a technique for enhancing strength and ductility of normal-(e.g., [1][2][3]) and highstrength (e.g., [4][5][6][7][8][9]) concretes (NSC and HSC). A large number of experimental studies into axial compressive behavior have been performed over the last two decades producing over 3000 test results, as discussed and assessed in recent comprehensive review studies [10,11].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Shrinkage Strains of Normal- and HighStrength Concrete-Filled FRP Tubes

Vincent¹

2018

Nanomaterials, Functional and Composite Materials

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Abstract.It is now well established that concrete-filled fiber reinforced polymer (FRP) tubes (CFFTs) are an attractive construction technique for new columns, however studies examining concrete shrinkage in CFFTs remain limited. Concrete shrinkage may pose a concern for CFFTs, as in these members the curing of concrete takes place inside the FRP tube. This paper reports the findings from an experimental study on concrete shrinkage strain measurements for CFFTs manufactured with normal-and high-strength concrete (NSC and HSC). A total of 6 aramid FRP (AFRP)-confined concrete specimens with circular cross-sections were manufactured, with 3 specimens each manufactured using NSC and HSC. The specimens were instrumented with surface and embedded strain gauges to monitor shrinkage development of exposed concrete and concrete sealed inside the CFFTs, respectively. All specimens were cylinders with a 152 mm diameter and 305 mm height, and their unconfined concrete strengths were 44.8 or 83.2 MPa. Analysis of the shrinkage measurements from concrete sealed inside the CFFTs revealed that embedment depth and concrete compressive strength only had minor influences on recorded shrinkage strains. However, an analysis of shrinkage measurements from the exposed concrete surface revealed that higher amounts of shrinkage can occur in HSC. Finally, it was observed that shrinkage strains are significantly higher for concrete exposed at the surface compared to concrete sealed inside the CFFTs.

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Influence of fiber orientation and specimen end condition on axial compressive behavior of FRP-confined concrete

Cited by 216 publications

References 39 publications

Factors Influencing Hoop Rupture Strains of FRP-Confined Concrete

Factors Influencing Hoop Rupture Strains of FRP-Confined Concrete

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

An Experimental Study on Shrinkage Strains of Normal- and HighStrength Concrete-Filled FRP Tubes

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