Finite element analysis of concrete-filled steel tube (CFST) columns with circular sections under eccentric load

Ouyang, Yi; Kwan, A.K.H.; Lo, S.H.; Ho, J.C.M.

doi:10.1016/j.engstruct.2017.06.064

Cited by 52 publications

(13 citation statements)

References 41 publications

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“…For all the CFST specimens, during the initial elastic stage, the values of the lateral-to-axial strain ratio were generally around 0.30, which is consistent with Poisson’s ratio of 0.29 of the steel coupons measured in this study. Given that Poisson’s ratio of concrete is normally between 0.15 and 0.20 (Fam and Rizkalla, 2001; Martínez-Lage et al, 2012; Yi et al, 2012), it is reasonable to postulate that there was delamination between the steel tube and the concrete infill (Ouyang et al, 2017; Ouyang and Kwan, 2018). At an axial strain of higher than 0.5%, the value of the lateral-to-axial strain ratio started to increase substantially.…”

Section: Axial Compression Test Results Of Cfst Specimensmentioning

confidence: 99%

Influence of concrete mix proportions on axial performance of concrete-filled steel tubes made with self-compacting concrete

Ouyang

Zeng

et al. 2019

Advances in Structural Engineering

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Self-compacting concrete is quite commonly used in concrete-filled steel tube structures, but the compaction level of the self-compacting concrete, that is, the percentage of volume occupied by materials other than air void, within the steel tube is seldom investigated. The authors are of the view that the concrete mix proportions of the self-compacting concrete may have significant effects on the compaction level of the self-compacting concrete, which will be quantified by the ‘compaction index’ proposed in this study and thus the performance of the concrete-filled steel tube. Moreover, the mix proportions would also influence the performance of the concrete-filled steel tube by affecting the aggregate–aggregate and aggregate–paste interactions of the concrete, albeit this important issue is rarely addressed in previous studies either. Herein, a pilot study is conducted to investigate the influences of the self-compacting concrete mix proportions on the axial performance of concrete-filled steel tube. Four groups of concrete-filled steel tube specimens made with different self-compacting concrete were tested, and the investigated concrete mix parameters included the paste volume, fine to coarse aggregate ratio, and 9.5–19.0 mm aggregate ratio. It was found that the compaction index of the self-compacting concrete is a key factor enabling the successful use of self-compacting concrete in concrete-filled steel tube. Moreover, the paste volume and aggregate proportions of the concrete mix have certain effects on the post-peak behaviour and ductility of concrete-filled steel tube.

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Section: Axial Compression Test Results Of Cfst Specimensmentioning

confidence: 99%

Influence of concrete mix proportions on axial performance of concrete-filled steel tubes made with self-compacting concrete

Ouyang

Zeng

et al. 2019

Advances in Structural Engineering

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“…As the Poisson's ratio of concrete is not as much as steel (0.18 and 0.3 individually) at the underlying flexible stage, the hoop stress in steel cylinder is very little and becomes observable when dilatency of concrete is bigger than previously and ends up inelastic [21]. Attributable to this variety in stresses and Poisson's ratio delamination of concrete from steel turns into a lasting issue which diminishes the adequacy of imprisonment of concrete [18].…”

Section: Introductionmentioning

confidence: 98%

Nonlinear Analysis of Circular Concrete Filled Steel Tube Columns under Axial Loading

Tiwary¹,

Gupta²

2019

IJITEE

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Concrete filled steel tube (CFST) columns are composite member mainly consists of concrete infilled in steel tube. In current construction industry, CFST columns are preferred to provide lateral resistance in both unbraced and braced building structures. In this paper, finite element studies were carried out on concrete filled steel tube columns under an axial composite loading by using ABAQUS/CAE. The inelastic behavior of concrete and steel tube was defined to the model by using concrete damaged plasticity model (CDP) and Johnson-cook model respectively which is available in ABAQUS/CAE. The diameters of columns were considered as 100 mm, 125 mm and 150 mm, whereas the length of columns was kept constant, i.e. 600 mm for all models. The thickness of steel tube was considered as 4 mm and 5 mm for all diameters of columns. The concrete infilled of grade M30 was used in this study. The simulations were carried out against composite loading to study the response of CFST columns in terms of load carrying capacity, displacement and von-mises stresses. The mesh conversion study was also carried out to obtain the best size of mesh corresponding to the experimental load carrying capacity of CFST columns

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“…15,16 Concrete filled steel tube (CFST) column has been widely used in high-rise buildings, pile foundations, and bridge piers. [17][18][19][20][21][22][23][24][25][26][27] Recently, the CFST columns with the infilled recycled aggregate concrete (RAC) were developed to reduce the industrial wastes. [28][29][30][31][32][33] Nevertheless, the shrinking cracks in the CFST columns with the ordinary concrete or RAC is evident, which will reduce the structural capacity.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of self‐stressing steel slag aggregate concrete filled steel tubular stub columns

Fang

Zhang

et al. 2020

Structural Concrete

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The mechanical behaviors of the self‐stressing steel slag aggregate concrete filled steel tubular (SSSACFST) stub column are investigated for practical structural applications. Twelve specimens under axial and eccentric compression are tested. The influences of different parameters, such as the eccentricity, the diameter–thickness ratio of the steel tube and the expansion rate of the steel slag aggregate concrete (SSAC) are studied. The experimental results show that the shear and the bending deformation dominate the failures of the specimens under axial and eccentric compression, respectively. The column with a high diameter–thickness ratio has a low ultimate bearing capacity and ultimate strain. The incremental range of the load capacity and the ultimate axial and circumferential strains of the specimens will be increased by raising the expansion rate of the SSAC. Based on the experimental results, the applicability of the current concrete filled steel tube design provisions for the SSSACFST stub columns is evaluated, and two analytical models for predicting the bearing capacity of the SSSACSFT stub columns under axial and eccentric compression are proposed.

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Finite element analysis of concrete-filled steel tube (CFST) columns with circular sections under eccentric load

Cited by 52 publications

References 41 publications

Influence of concrete mix proportions on axial performance of concrete-filled steel tubes made with self-compacting concrete

Influence of concrete mix proportions on axial performance of concrete-filled steel tubes made with self-compacting concrete

Nonlinear Analysis of Circular Concrete Filled Steel Tube Columns under Axial Loading

Mechanical behavior of self‐stressing steel slag aggregate concrete filled steel tubular stub columns

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