Axial and lateral stress–strain model for circular concrete-filled steel tubes with external steel confinement

Kwan, A.K.H.; Dong, C.X.; Ho, J.C.M.

doi:10.1016/j.engstruct.2016.03.026

Cited by 84 publications

(31 citation statements)

References 22 publications

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“…where A st is the total equivalent steel area and can be calculated using Equations (8) and (9) for columns with external ring and spiral confinements, respectively.…”

Section: Prediction Of the Ultimate Strengthmentioning

confidence: 99%

“…In other words, as the concrete Poisson's ratio is less than the steel, the lateral expansion of infilled concrete will be smaller than the steel tube at the elastic stage. Hence, no composite interaction between the two components will occur before the spreading of micro-cracks in the concrete and the beginning of inelastic outward buckling of steel [8,9]. Therefore, a different approach was suggested to strengthen the bond behaviour of CFST by utilising steel stiffeners.…”

Section: Introductionmentioning

confidence: 99%

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Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression

et al. 2019

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Concrete-filled steel tube (CFST) structural members have been widely used in engineering projects for their superior strength and ductility. However, the different lateral dilation characteristics between concrete infill and steel tube have caused imperfect composite interaction during the early loading stage. To overcome this issue, external steel confinements in the form of rings and spiral were previously suggested to minimise the lateral expansion of the steel tube and enhance the concrete confinement effects. This study presented the analytical behaviour of circular CFST short columns with an external ring or spiral confinements which are subjected to axial loading. An explicit finite element (FE) model was developed and verified based on previous experimental findings. Besides that, this study analysed the failure modes, axial load–strain relationship, stress distributions, and bond strength of the composite column components. Parametric analysis was also undertaken to evaluate the impact of material strengths, total steel ratio, and diameter-to-thickness ratio. The results suggest that the use of external steel confinement can enhance the compressive behaviour of CFSTs better than increasing the thickness of the steel tube when using the same steel ratio. Finally, simplified design formulations were developed to accurately calculate the ultimate capacity of CFST columns with and without external steel confinement.

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“…where A st is the total equivalent steel area and can be calculated using Equations (8) and (9) for columns with external ring and spiral confinements, respectively.…”

Section: Prediction Of the Ultimate Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression

et al. 2019

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“…Steel tube and concrete not only compensate each other's shortcomings but also give full play to each other's advantages. Consequently, this composite structure exhibits high bearing capacity, good plasticity, and convenient construction properties [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Axial Compression Performance and Ultrasonic Testing of Multicavity Concrete‐Filled Steel Tube Shear Wall under Axial Load

Yan

Sun

et al. 2020

Advances in Civil Engineering

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In this study, the mechanical performance of multicavity concrete-filled steel tube (CFST) shear wall under axial compressive loading is investigated through experimental, numerical, and theoretical methodologies. Further, ultrasonic testing is used to assess the accumulated damage in the core concrete. Two specimens are designed for axial compression test to study the effect of concrete strength and steel ratio on the mechanical behavior of multicavity CFST shear wall. Furthermore, a three-dimensional (3D) finite element model is established for parametric studies to probe into compound effect between multicavity steel tube and core concrete. Based on finite element simulation and limit equilibrium theory, a practical formula is proposed for calculating the axial compressive bearing capacity of the multicavity CFST shear wall, and the corresponding calculation results are found to be in good agreement with the experimental results. This indicates that the proposed formula can serve as a useful reference for engineering applications. In addition, the ultrasonic testing results revealed that the damage process of core concrete under axial load can be divided into three stages: extension of initial cracks (elastic stage), compaction due to hooping effect (elastic-plastic stage), and overall failure of the concrete (failure stage).

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“…Existing studies have determined that the local buckling of the steel tube may result in a substantial degradation in the strength and the stiffness and a considerable reduction in the energy-absorption capacity of the CFT column (Cai et al, 2016; Sakino et al, 2004). To prevent or delay a local buckling failure of the steel tube, a number of strengthening technologies have been recently developed: (1) internal stiffeners (Abedi et al, 2008; Dabaon et al, 2009; Ding et al, 2017; Petrus et al, 2010), (2) internal reinforcing ties or binding bars (Ho and Lai, 2013; Long and Cai, 2013; Zuo et al, 2012), (3) internal loop or spiral stirrup strengthening (Ding et al, 2014), and (4) external Fiber Reinforced polymer (FRP) (Park and Choi, 2013; Teng et al, 2013; Wei et al, 2014; Yu et al, 2016) or steel bar confinement (Ho and Dong, 2014; Kwan et al, 2016; Lai and Ho, 2014). Extensive experimental results demonstrated that these strengthening methods can effectively restrain and delay local buckling of the steel tube, thus increasing the strength, ductility, and seismic resistance of CFT columns.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of concrete-filled steel tubular columns confined with high-strength steel wire

Wei

Cheng

et al. 2019

Advances in Structural Engineering

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The use of high-strength steel wires is proposed to provide external confinement for concrete-filled steel tubular columns. This article presents an experimental study on high-strength steel-wire-confined concrete-filled steel tubular columns with various high-strength steel wire spacings and steel tube thicknesses and diameters. As observed from the experimental results, high-strength steel wires can effectively constrain and delay the local buckling of the steel tube in concrete-filled steel tubular columns. As a result, the load-carrying capacity and the post-peak stiffness of concrete-filled steel tubular columns are significantly increased by the high-strength steel wire confinement. When the spacing of the high-strength steel wires decreases, the load–axial strain response can evolve from a softening behavior to a hardening behavior for the concrete-filled steel tubular columns. Moreover, theoretical models were developed to predict the load-carrying capacity of the externally confined concrete-filled steel tubular columns, taking into account the mechanical mechanism and the triaxial stress state of the inner concrete. The analytical results are generally in reasonable agreement with the experimental results.

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Axial and lateral stress–strain model for circular concrete-filled steel tubes with external steel confinement

Cited by 84 publications

References 22 publications

Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression

Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression

Axial Compression Performance and Ultrasonic Testing of Multicavity Concrete‐Filled Steel Tube Shear Wall under Axial Load

Experimental investigations of concrete-filled steel tubular columns confined with high-strength steel wire

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