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Nonlinear post-fire simulation of concentrically loaded rectangular thin-walled concrete-filled steel tubular short columns accounting for progressive local buckling

Journal Article


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Abstract


  • The repair of fire-damaged thin-walled rectangular concrete-filled steel tubular (CFST) columns in engineering

    structures after fire exposure requires the assessment of their residual strength and stiffness. Existing numerical

    models have not accounted for the effects of local buckling on the post-fire behavior of CFST columns with

    rectangular thin-walled sections. This paper describes a nonlinear post-fire simulation technique underlying the

    theory of fiber analysis for determining the residual strengths and post-fire responses of concentrically loaded

    short thin-walled rectangular CFST columns accounting for progressive local buckling. The post-fire stress-strain

    laws for concrete in rectangular CFST columns are proposed based on available test data and implemented in the

    theoretical model. An innovative numerical scheme for modeling the progressive local and post-local buckling of

    CFST thin-walled columns is discussed. The nonlinear post-fire simulation model is verified by experimental data

    and then used to investigate the significance of local buckling, material strengths and width-to-thickness ratio on

    the post-fire responses of CFST stub columns. The proposed post-fire computer model is shown to be capable of

    predicting well the residual stiffness and strength of concentrically loaded thin-walled CFST columns after fire

    exposure. A design formula is proposed that estimates well the post-fire residual strengths of CFST columns.

    Computational results presented provide a better understanding of the post-fire behavior of CFST columns

    fabricated by thin-walled sections incorporating local and post-local buckling.

UOW Authors


  •   Kamil, Ghanim Mohammed (external author)
  •   Liang, Qing Quan (external author)
  •   Hadi, Muhammad

Publication Date


  • 2019

Citation


  • Kamil, G. Mohammed., Liang, Q. Quan. & Hadi, M. N. S. (2019). Nonlinear post-fire simulation of concentrically loaded rectangular thin-walled concrete-filled steel tubular short columns accounting for progressive local buckling. Thin-Walled Structures, 145 106423-1-106423-11.

Scopus Eid


  • 2-s2.0-85072714888

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4265&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3245

Start Page


  • 106423-1

End Page


  • 106423-11

Volume


  • 145

Place Of Publication


  • United Kingdom

Abstract


  • The repair of fire-damaged thin-walled rectangular concrete-filled steel tubular (CFST) columns in engineering

    structures after fire exposure requires the assessment of their residual strength and stiffness. Existing numerical

    models have not accounted for the effects of local buckling on the post-fire behavior of CFST columns with

    rectangular thin-walled sections. This paper describes a nonlinear post-fire simulation technique underlying the

    theory of fiber analysis for determining the residual strengths and post-fire responses of concentrically loaded

    short thin-walled rectangular CFST columns accounting for progressive local buckling. The post-fire stress-strain

    laws for concrete in rectangular CFST columns are proposed based on available test data and implemented in the

    theoretical model. An innovative numerical scheme for modeling the progressive local and post-local buckling of

    CFST thin-walled columns is discussed. The nonlinear post-fire simulation model is verified by experimental data

    and then used to investigate the significance of local buckling, material strengths and width-to-thickness ratio on

    the post-fire responses of CFST stub columns. The proposed post-fire computer model is shown to be capable of

    predicting well the residual stiffness and strength of concentrically loaded thin-walled CFST columns after fire

    exposure. A design formula is proposed that estimates well the post-fire residual strengths of CFST columns.

    Computational results presented provide a better understanding of the post-fire behavior of CFST columns

    fabricated by thin-walled sections incorporating local and post-local buckling.

UOW Authors


  •   Kamil, Ghanim Mohammed (external author)
  •   Liang, Qing Quan (external author)
  •   Hadi, Muhammad

Publication Date


  • 2019

Citation


  • Kamil, G. Mohammed., Liang, Q. Quan. & Hadi, M. N. S. (2019). Nonlinear post-fire simulation of concentrically loaded rectangular thin-walled concrete-filled steel tubular short columns accounting for progressive local buckling. Thin-Walled Structures, 145 106423-1-106423-11.

Scopus Eid


  • 2-s2.0-85072714888

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4265&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3245

Start Page


  • 106423-1

End Page


  • 106423-11

Volume


  • 145

Place Of Publication


  • United Kingdom