Mechanical behavior of concrete-filled square steel tube with FRP-confined concrete core subjected to axial compression

Feng, Peng; Shi, Cheng; Bai, Yu; Ye, Lieping

doi:10.1016/j.compstruct.2014.12.053

Cited by 331 publications

(77 citation statements)

References 33 publications

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“…While structures made of conventional materials may exhibit some postyield stiffness (usually less than 10% of the initial stiffness), the application of new materials with high strength and superior elastic properties can easily be used to develop structures with a much higher and more stable postyield stiffness. These high‐strength elastic materials, such as fiber‐reinforced polymer (FRP) and high‐strength steel bars, exhibit little or approximately no plastic behavior and have been recently used to fabricate many novel materials, members, and structures. Compared with the components made of only conventional materials (steel and concrete), increasingly more materials, members, and structures that incorporate both high‐strength elastic materials and conventional materials show significant postyield hardening (PYH) skeleton curves (Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the components made of only conventional materials (steel and concrete), increasingly more materials, members, and structures that incorporate both high‐strength elastic materials and conventional materials show significant postyield hardening (PYH) skeleton curves (Figure ). A variety of such innovative components are summarized in Table (references cited in Table ). These materials, members, and structures can be called PYH materials, members, and structures, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Seismic responses of postyield hardening single–degree‐of‐freedom systems incorporating high‐strength elastic material

Qiang

Feng

Qu³

2019

Earthq Engng Struct Dyn

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It is widely accepted that ductility design improves the seismic capacity of structures worldwide. Nevertheless, inelastic deformation allows serious damage to occur in structures. Previous studies have shown that a certain level of postyield stiffness may reduce both the peak displacement and residual deformation of a structure. In recent years, several high-strength elastic materials, such as fiber-reinforced polymer (FRP) and high-strength steel bars, have been developed. Application of these materials can easily provide a structure with a much higher and more stable postyield stiffness. Many materials, members, and structures that incorporate both high-strength elastic materials and conventional materials show significant postyield hardening (PYH) behaviors.The significant postyield stiffness of PYH structures can help effectively reduce both peak and residual deformations, providing a choice when designing resilient structures. However, the findings of previous studies of structures with elastic-perfectly plastic (EPP) behavior or small postyield stiffness may not be accurate for PYH structures. The postyield stiffness of a structure must be considered an important primary structural parameter, in addition to initial stiffness, yielding strength, and ductility. In this paper, extensive time history and statistical analyses are carried out for PYH single-degree-of-freedom (SDOF) systems. The mean values and coefficients of variation of the peak displacement and residual deformation are obtained and discussed. A new R-μ p -T-α relationship and damage index for PYH structures are proposed. A theoretical model for the calculation of residual deformation is also established. These models provide a basis for developing the appropriate seismic design and performance evaluation procedures for PYH structures.KEYWORDS damage index, high-strength elastic materials, peak displacement, postyield stiffness, residual deformation, single degree of freedom

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic responses of postyield hardening single–degree‐of‐freedom systems incorporating high‐strength elastic material

Qiang

Feng

Qu³

2019

Earthq Engng Struct Dyn

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“…Karimi et al [18] proposed a type of FRP-encased steel-concrete composite columns in which a circular FRP was placed around the steel I-section and had the concrete filled between the steel I-section and the FRP tube. Feng et al [19] proposed a steel-concrete-FRP-concrete column which had a square steel tube as the outer layer and a circular filament-wound FRP tube as the inner layer, with concrete filled both between these two layers and within the FRP tube. e results of these studies showed that the strength of concrete, FRP, and steel could be effectively utilized in the composite columns.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of CFRP‐Confined CFST Stub Columns under Axial Compression

Guo

Zhang

2018

Advances in Civil Engineering

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is paper presented a comparative study of concrete-filled steel tubular (CFST) stub columns with three different confinement types from carbon fiber reinforced polymer (CFRP): outer circular CFRP, inner circular CFRP, and outer square CFRP. e compressive mechanism and physical properties of the composite column were analyzed firstly aiming at investigating the confinement effect of CFRP. Ultimate axial bearing capacity of these three CFRP-confined CFST columns was calculated based on Unified eory of CFSTand elastoplastic limit equilibrium theory, respectively. Meanwhile, the corresponding tests are adopted to validate the feasibility of the two calculation models. rough data analysis, the study confirmed the ultimate strength calculation results of the limit equilibrium method were found to be more reliable and approximate to the test results than those of Unified eory of CFST. en axial bearing capacity of the pure CFSTcolumn was predicted to evaluate the bearing capacity enhancement ratio of the three types of composite columns. It was demonstrated that the averaged enhancement ratio is 16.4 percent, showing that CFRP-confined CFST columns had a broad engineering applicability. rough a comparative analysis, this study also confirmed that outer circular CFRP had the best confinement effect and outer square CFRP did better than inner circular CFRP. e confinement effect of CFRP increased with the decrease of concrete strength, and it was proportional with relative proportions of CFRP and steel under the same concrete strength.

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“…Stiffness, strength, ductility, seismic and fire resistance, deformation characteristics, elimination of formwork costs, installation, economy, and good performance are among the advantages achieved in using such a structural system. Accordingly, a great deal of experimental research works has been done by Zeghiche and Chaoui (2005), Ellobody et al (2006), Yang and Han (2006), Guo et al (2007), Lai and Ho (2014), Feng et al (2015), and Wang et al (2015) among many others, to investigate the behaviour of CFST columns. Alternatively, much numerical research work has been reported by Shams and Saadeghvaziri (1999), Hu et al (2003), Valipour and Foster (2010), Liang (2011), Tao et al (2013), Wang and Young (2013), Patel et al (2014), Zhang et al (2015), Aslani et al (2015), and analytical studies by Choi and Xiao (2010), Schneider (1998), Brauns (1999, Susantha et al (2001), Fam et al (2004), Kuranovas et al (2009).…”

Section: Introductionmentioning

confidence: 99%

Buckling of Slender Concrete-Filled Steel Tubes with Compliant Interfaces

Schnabl

Planinc

2017

Lat. Am. j. solids struct.

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This paper presents an exact model for studying the global buckling of concrete-filled steel tubular (CFST) columns with compliant interfaces between the concrete core and steel tube. This model is then used to evaluate exact critical buckling loads and modes of CFST columns. The results prove that interface compliance can considerably reduce the critical buckling loads of CFST columns. A good agreement between analytical and experimental buckling loads is obtained if at least one among longitudinal and radial interfacial stiffnesses is high. The parametric study reveals that buckling loads of CFST columns are very much affected by the interfacial stiffness and boundary conditions.

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Mechanical behavior of concrete-filled square steel tube with FRP-confined concrete core subjected to axial compression

Cited by 331 publications

References 33 publications

Seismic responses of postyield hardening single–degree‐of‐freedom systems incorporating high‐strength elastic material

Seismic responses of postyield hardening single–degree‐of‐freedom systems incorporating high‐strength elastic material

Comparative Study of CFRP‐Confined CFST Stub Columns under Axial Compression

Buckling of Slender Concrete-Filled Steel Tubes with Compliant Interfaces

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