Numerical analysis of axially loaded circular high strength concrete-filled double steel tubular short columns

Ahmed, Mizan; Liang, Qing Quan; Patel, Vipulkumar Ishvarbhai; Hadi, Muhammad N.S.

doi:10.1016/j.tws.2019.02.001

Cited by 89 publications

(49 citation statements)

References 35 publications

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“…Little research has been reported on the structural behavior of thin-walled CFDST square columns that are subjected to eccentric loads. This paper Most of the investigations on CFDST columns reported previously has focused on circular cross-section [1][2][3][4][5][6][7][8][9][10][11][12] and tests on short square CFDST columns consisting of an inner circular steel tube have been very limited [13][14][15][16]. Pei [13] performed tests to determine the structural performance of stub CFDST square columns under axial and eccentric loads.…”

Section: Introductionmentioning

confidence: 99%

“…c  and c  represent the longitudinal concrete compressive stress and corresponding strain, respectively; ' cc f and ' cc  the compressive strength and corresponding strain of confinedconcrete, respectively; c E the concrete elastic modulus[12], which is taken as 4400 reduction factor given by Liang[33], which considers the column size effect on the concrete compressive strength, and c D is taken as   strength as well as its corresponding strain of the core-…”

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confidence: 99%

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Experimental and numerical studies of square concrete-filled double steel tubular short columns under eccentric loading

Ahmed

Liang

Patel

et al. 2019

Engineering Structures

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Square concrete-filled double steel tubular (CFDST) beam-columns consisting of an internal circular steel tube have increasingly been utilized in composite building structures because of their high structural performance. This paper describes experimental and numerical studies on the structural responses of square thin-walled CFDST columns loaded eccentrically. Tests on twenty short square CFDST columns were undertaken that included sixteen columns under eccentric loading and four columns under concentric loading. The parameters examined in the experiments included the cross-sectional dimensions, the width-to-thickness ratios of outer and internal tubes and loading eccentricity. The measured ultimate strengths, load-shortening responses, load-lateral displacement curves, stress-strain curves and observed failure modes are presented. A numerical model incorporating the fiber analysis is developed that predicts the moment-curvature responses and axial load-moment strength envelopes of CFDST columns.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Experimental and numerical studies of square concrete-filled double steel tubular short columns under eccentric loading

Ahmed

Liang

Patel

et al. 2019

Engineering Structures

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“…The stress-strain relationships suggested by Liang [34] are used to simulate the ascending branch while the descending branch is described by the equations proposed by Lim and Ozbakkaloglu [44]. The descending parabolic branch of the stress-strain curve is determined by the following expression given by Lim and Ozbakkaloglu [44] ) ( (14) in which rp f denotes the lateral pressure applied by the steel tube on the concrete.…”

Section: Constitutive Laws Of Concretementioning

confidence: 99%

“…These studies showed that the core concrete was confined by both the inner and outer circular steel tubes, which increased both the ductility and capacity of circular CFDST columns. Ahmed et al [14] proposed confinement models for the core concrete in short CFDST circular columns based on available test results while the confinement model presented by Hu et al [15] was adopted to compute the maximum compressive strength of the concrete between the two tubes.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear analysis of rectangular concrete-filled double steel tubular short columns incorporating local buckling

Ahmed

Liang

Patel

et al. 2018

Engineering Structures

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Rectangular concrete-filled double steel tubular (CFDST) columns with inner circular steel tube possess higher structural performance than conventional concrete-filled steel tubular (CFST) columns. However, the local buckling of the outer steel tube of thin-walled rectangular CFDST columns has not been accounted for in the existing fiber element models and design codes that may overestimate the column ultimate axial strengths. This paper describes a computationally efficient fiber-based modeling technique developed for determining the behavior of concentrically-loaded rectangular CFDST short columns including the local buckling effects of the external steel tube and the confinement offered by the internal circular steel tube. The effective width concept is used to simulate the post-local buckling of the outer steel tube. Comparative studies are undertaken to verify the fiber-based model with the relevant test results. The computational model is then employed to investigate the axial load-strain responses of rectangular CFDST short columns with various key design variables. A design equation is developed for computing the ultimate axial loads of short rectangular CFDST columns and compared with design methods given in several international design codes. It is shown that the fiber-based modeling technique and the proposed design model predict well the structural performance of short CFDST columns.

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“…Previously researchers studied the performance of CFDST short columns with various cross-sections [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The circular hollow tube (CHS) used for both outer and inner tubes in CFDST columns provides the most effective confinement to the core concrete compared to the other possible cross-sections.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Eccentrically Loaded Circular ConcreteFilled Double Steel Tubular Short Columns

Ci¹,

Ahmed²,

Chen³

et al. 2021

International Conference on Civil, Structural and Transportation Engineering

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Circular concrete-filled double steel tubular (CFDST) column offers improved strength and ductility compared to conventional concrete-filled steel tubular (CFST) column. This paper reports an experimental program carried out on short CFDST columns loaded either concentrically or eccentrically. The test parameters examine the influences of the eccentricity ratio and the diameter-to-thickness ratio of the steel tubes. The eccentricity ratio varied from 0 to 1.64 while the diameter-to-thickness ratio of the outer and inner steel tubes ranged between 43.8 to 54.75 and 32.57 to 45.6, respectively. It is observed that the tested columns failed in a ductile manner, however, an increase of the eccentricity ratio reduces the ultimate loads of the columns remarkably.

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Numerical analysis of axially loaded circular high strength concrete-filled double steel tubular short columns

Abstract: Numerical analysis of axially loaded circular high strength concrete-filled double Numerical analysis of axially loaded circular high strength concrete-filled double steel tubular short columns steel tubular short columns

Cited by 89 publications

References 35 publications

Experimental and numerical studies of square concrete-filled double steel tubular short columns under eccentric loading

Experimental and numerical studies of square concrete-filled double steel tubular short columns under eccentric loading

Nonlinear analysis of rectangular concrete-filled double steel tubular short columns incorporating local buckling

Experimental Investigations of Eccentrically Loaded Circular ConcreteFilled Double Steel Tubular Short Columns

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