FRP–HSC–steel composite columns: behavior under monotonic and cyclic axial compression

Ozbakkaloglu, Togay; Fanggi, Butje Alfonsius Louk

doi:10.1617/s11527-013-0216-0

Cited by 71 publications

(37 citation statements)

References 41 publications

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“…However, due to the limitations in the parametric ranges of the experimental results considered in their development, the applicability of the existing models are often restricted to specific specimens subsets. The current availability of variety of concrete confinement techniques and reinforcing materials [4,[8][9][10][11][12][13][14][15][16][17][18][19][20][21], and the abundance of concretes with different mechanical and material properties [9,[22][23][24][25][26] poses a challenge for engineers in finding a suitable model given the possible composite combinations of these materials.…”

Section: Introductionmentioning

confidence: 99%

Stress–strain model for normal- and light-weight concretes under uniaxial and triaxial compression

Lim

Ozbakkaloglu

2014

Construction and Building Materials

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216

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Section: Introductionmentioning

confidence: 99%

Stress–strain model for normal- and light-weight concretes under uniaxial and triaxial compression

Lim

Ozbakkaloglu

2014

Construction and Building Materials

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216

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“…[38] model. Based on the experimental results in the present study, Equations (19) and (20), which are derived through a trial and error process, are proposed to account for the effects of the elliptical aspect ratio, the inner void, and the cross-section shape of the inner steel tube for elliptical DSTCs.…”

Section: Discussionmentioning

confidence: 99%

“…To summarize, the proposed stress-strain model for confined concrete in elliptical DSTCs includes Equations (19) and (20) proposed in the present study and Equations (1), (3), (4), (9), (11)-(13), (16)- (18). e void area ratio in Equation (19) (i.e., the ratio between the area of the concrete void and the area of the outer elliptical section of concrete), is different from the void ratio in Equation (6) of Yu et al 's [11] model which is defined as the ratio between the outer diameter of the steel tube and the outer diameter of the annular concrete section .…”

Section: Discussionmentioning

confidence: 99%

“…Since then, hybrid DSTCs have received extensive research attention from researchers. Existing research on hybrid DSTCs mainly covers the following aspects: (1) hybrid DSTCs under monotonic axial compression [8][9][10][11][12][13][14][15][16]; (2) hybrid DSTCs under cyclic axial compression [17][18][19]; (3) hybrid DSTCs under eccentric compression [20,21]; (4) hybrid DSTCs subjected to combined axial compression and cyclic lateral loading [22][23][24][25]; (5) hybrid DSTCs under lateral impact loading [26,27]. Yu [10] presented the first systematic study of hybrid DSTCs under axial compression, in which small-scale specimens with normal strength concrete (NSC) were tested.…”

Section: Introductionmentioning

confidence: 99%

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Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression

Zhang

Feng

Wang

et al. 2020

Advances in Polymer Technology

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Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a novel form of hollow columns consisting of an outer FRP tube, an inner steel tube, and an annular layer of concrete between the two tubes. Due to the effective confinement of the two tubes, the concrete in hybrid DSTCs is well confined, leading to excellent ductility and strength enhancement. Hybrid DSTCs also have excellent corrosion resistence due to the effective protection of the outer FRP tube. However, existing studies mainly focused on hybrid DSTCs with a circular cross-section. When subjecting to different loads in the two horizontal directions, elliptical columns are preferred as they can provide different bending stiffness and moment capacity around two axes of symmetry without significantly reducing the confining effect of the FRP tube. This paper extends the existing work on circular DSTCs to elliptical DSTCs with a particular focus on four issues: the effect of elliptical aspect ratio (i.e., the ratio of the major axis to the minor axis of the outer elliptical cross-section), the effect of the FRP tube thickness, the effect of void area ratio (i.e., the ratio of the area of concrete void to the area of the outer elliptical section), and the effect of the cross-section of the inner steel tube (i.e., both rectangular and elliptical steel tubes were used). Experimental results show that, the averaged peak stress of the confined concrete in elliptical DSTCs increases with the increase in the elliptical aspect ratio, whereas the elliptical aspect ratio has no obvious effect on the ultimate axial strain; the cross-section shape of the inner steel tube has significant effect on the axial stress-strain behavior of the confined concrete in elliptical DSTCs; elliptical DSTCs with an elliptical steel tube exhibit much better ductility and strength enhancement than those specimens with a rectangular steel tube. A simple stress-strain model of confined concrete was proposed for elliptical DSTCs to account for the effects of the elliptical aspect ratio, the inner void, and the shape of the inner steel tube, which can provide reasonably accurate but conservative predictions.

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“…These studies revealed that the majority of early experimental studies focused on FRP-confined normal-strength concrete (NSC) (e.g., [4][5][6][7][8][9]) with studies on FRP-confined high-strength concrete (HSC) only recently gaining increased research attention. The extensive number of studies that have recently been undertaken on FRP-confined HSC that investigated the behavior of HSC-filled FRP tube columns (e.g., [10][11][12][13][14][15][16][17]) and FRP-HSC-steel composite columns (e.g., [18][19][20][21]) demonstrated the ability of these members to effectively combine the constitutive high-strength materials to exhibit a highly ductile behavior under various loading conditions. The review of the literature reported in Lim and Ozbakkaloglu [3] revealed that the existing database of experimental studies contained specimens with different overlap configurations.…”

Section: Introductionmentioning

confidence: 99%

Influence of overlap configuration on compressive behavior of CFRP-confined normal- and high-strength concrete

Vincent

Ozbakkaloglu

2015

Mater Struct

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This paper presents the findings of an experimental investigation on the effect of overlap configuration on carbon fiber-reinforced polymer (CFRP)-confined normal-and high-strength concrete. A total of 33 specimens were prepared and tested under monotonic axial compression. All specimens were cylinders with 152 mm diameter and 305 mm height and confined by CFRP tubes. Two different concrete mixes were examined, with average compressive strengths of 52.0 and 84.7 MPa. The effect of overlap configuration was examined by manufacturing the specimens with different properties at the overlap region including overlap length, continuity and distribution. Axial and lateral behavior was recorded to observe the axial stress-strain relationship and hoop strain behavior for concentric compression. Ultimate axial and lateral conditions are tabulated and stress-strain curves have been provided. Detailed plots of hoop strain development and lateral confinement pressure at ultimate are presented. The results indicate that FRP overlap length has no significant influence on strain enhancement ratio (e cu /e co ), but an increase in overlap length leads to a slight increase in strength enhancement ratio (f 0 cc /f 0 co ), with these observations equally applicable to both continuously and discontinuously wrapped specimens. The results also indicate that continuity of the FRP sheet in the overlap region has some influence on the effectiveness of FRP confinement. Furthermore, it was observed that the distribution of FRP overlap regions for discontinuously wrapped specimens can influence the axial compressive behavior of these specimens in certain overlap configurations. Finally, it is found that the distribution of lateral confining pressure around specimen perimeter becomes less uniform for specimens with higher concrete strengths and those manufactured with overlap regions that are not evenly distributed. KeywordsConcrete Á High-strength concrete (HSC) Á Fiber-reinforced polymer (FRP) Á Columns Á Confinement Á Overlap Á Hoop strain Á Confinement pressure List of symbols D Diameter of concrete cylinder (mm) E f Modulus of elasticity of the fibers (MPa) Eff 1 Effectiveness of a given confinement arrangement in enhancing the ultimate strength (m -1 ) Eff 2 Effectiveness of a given confinement arrangement in enhancing the ultimate strain (m -1 ) f 0 cc Peak axial compressive stress of FRPconfined concrete (MPa) f 0 cc f 0 co Ultimate strength enhancement ratio f 0 co Peak axial compressive stress of unconfined concrete (MPa)

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FRP–HSC–steel composite columns: behavior under monotonic and cyclic axial compression

Cited by 71 publications

References 41 publications

Stress–strain model for normal- and light-weight concretes under uniaxial and triaxial compression

Stress–strain model for normal- and light-weight concretes under uniaxial and triaxial compression

Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression

Influence of overlap configuration on compressive behavior of CFRP-confined normal- and high-strength concrete

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