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

Journal Article


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Abstract


  • 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 envelops of CFDST columns. The model explicitly accounts for the influences of the confinement exerted

    by the internal circular steel tube on the core concrete and the progressive post-local buckling of the external

    steel tube. Efficient computer algorithms implementing the inverse quadratic method is developed to produce

    converged solutions to the nonlinear dynamic equilibrium equations generated in the analysis. Measurements

    from the tests are employed to validate the proposed numerical model. It is shown that there is a good agreement

    between theory and experiment. The computer model is utilized to demonstrate the significance of various

    parameters on the behavior of thin-walled short CFDST beam-columns.

UOW Authors


  •   Ahmed, Mizen (external author)
  •   Liang, Qing Quan (external author)
  •   Patel, Vipulkumar I. (external author)
  •   Hadi, Muhammad N. S. (external author)

Publication Date


  • 2019

Citation


  • Ahmed, M., Liang, Q., Patel, V. Ishvarbhai. & Hadi, M. N. S. (2019). Experimental and numerical studies of square concrete-filled double steel tubular short columns under eccentric loading. Engineering Structures, 197 109419-1-109419-17.

Scopus Eid


  • 2-s2.0-85069548381

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4072&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3053

Start Page


  • 109419-1

End Page


  • 109419-17

Volume


  • 197

Place Of Publication


  • United Kingdom

Abstract


  • 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 envelops of CFDST columns. The model explicitly accounts for the influences of the confinement exerted

    by the internal circular steel tube on the core concrete and the progressive post-local buckling of the external

    steel tube. Efficient computer algorithms implementing the inverse quadratic method is developed to produce

    converged solutions to the nonlinear dynamic equilibrium equations generated in the analysis. Measurements

    from the tests are employed to validate the proposed numerical model. It is shown that there is a good agreement

    between theory and experiment. The computer model is utilized to demonstrate the significance of various

    parameters on the behavior of thin-walled short CFDST beam-columns.

UOW Authors


  •   Ahmed, Mizen (external author)
  •   Liang, Qing Quan (external author)
  •   Patel, Vipulkumar I. (external author)
  •   Hadi, Muhammad N. S. (external author)

Publication Date


  • 2019

Citation


  • Ahmed, M., Liang, Q., Patel, V. Ishvarbhai. & Hadi, M. N. S. (2019). Experimental and numerical studies of square concrete-filled double steel tubular short columns under eccentric loading. Engineering Structures, 197 109419-1-109419-17.

Scopus Eid


  • 2-s2.0-85069548381

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4072&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3053

Start Page


  • 109419-1

End Page


  • 109419-17

Volume


  • 197

Place Of Publication


  • United Kingdom