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Numerical analysis of axially loaded rectangular concrete-filled steel tubular short columns at elevated temperatures

Journal Article


Abstract


  • Elevated temperatures significantly reduce the local buckling strengths of steel tubes and the ultimate strengths

    of rectangular concrete-filled steel tubular (CFST) columns exposed to fire. No fiber-based models have been

    developed that include local buckling effects on the fire-resistance of rectangular CFST columns. This paper

    presents a new fiber element model for the fire-resistance predictions of axially loaded rectangular CFST short

    columns at elevated temperatures considering local buckling. The thermal analysis problem of a CFST column is

    solved by the finite difference method to determine the temperature distribution within its cross-section including

    an air gap, concrete moisture content and the emissivity of exposure surfaces. The nonlinear stress

    analysis of axially loaded short CFST columns under fire recognizes the stress-strain behavior of concrete and

    steel at elevated temperatures. The expressions for initial local buckling and effective widths of steel plates are

    incorporated in the computational model to include the effects of local and post-local buckling on the fire

    responses of CFST columns. The existing experimental and numerical results are utilized to examine the accuracy

    of the fiber-based model. The fiber model developed is used to undertake parametric studies on the effects of

    local buckling, geometric and material properties and loading ratio on the thermal and structural responses of

    CFST short columns and the load distribution in steel tube and concrete. The numerical model proposed is

    demonstrated to simulate well the fire and structural performance of axially loaded CFST short columns under

    fire. Moreover, computational solutions presented provide a better understanding of the thermal and structural

    responses of CFST columns in fire.

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). Numerical analysis of axially loaded rectangular concrete-filled steel tubular short columns at elevated temperatures. Engineering Structures, 180 89-102.

Scopus Eid


  • 2-s2.0-85056703625

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2067

Number Of Pages


  • 13

Start Page


  • 89

End Page


  • 102

Volume


  • 180

Place Of Publication


  • United Kingdom

Abstract


  • Elevated temperatures significantly reduce the local buckling strengths of steel tubes and the ultimate strengths

    of rectangular concrete-filled steel tubular (CFST) columns exposed to fire. No fiber-based models have been

    developed that include local buckling effects on the fire-resistance of rectangular CFST columns. This paper

    presents a new fiber element model for the fire-resistance predictions of axially loaded rectangular CFST short

    columns at elevated temperatures considering local buckling. The thermal analysis problem of a CFST column is

    solved by the finite difference method to determine the temperature distribution within its cross-section including

    an air gap, concrete moisture content and the emissivity of exposure surfaces. The nonlinear stress

    analysis of axially loaded short CFST columns under fire recognizes the stress-strain behavior of concrete and

    steel at elevated temperatures. The expressions for initial local buckling and effective widths of steel plates are

    incorporated in the computational model to include the effects of local and post-local buckling on the fire

    responses of CFST columns. The existing experimental and numerical results are utilized to examine the accuracy

    of the fiber-based model. The fiber model developed is used to undertake parametric studies on the effects of

    local buckling, geometric and material properties and loading ratio on the thermal and structural responses of

    CFST short columns and the load distribution in steel tube and concrete. The numerical model proposed is

    demonstrated to simulate well the fire and structural performance of axially loaded CFST short columns under

    fire. Moreover, computational solutions presented provide a better understanding of the thermal and structural

    responses of CFST columns in fire.

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). Numerical analysis of axially loaded rectangular concrete-filled steel tubular short columns at elevated temperatures. Engineering Structures, 180 89-102.

Scopus Eid


  • 2-s2.0-85056703625

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2067

Number Of Pages


  • 13

Start Page


  • 89

End Page


  • 102

Volume


  • 180

Place Of Publication


  • United Kingdom