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Biaxially loaded high-strength concrete-filled steel tubular slender beam-columns, Part I: Multiscale simulation

Journal Article


Abstract


  • The steel tube walls of a biaxially loaded thin-walled rectangular concrete-filled steel tubular (CFST) slender

    beam-column may be subjected to compressive stress gradients. Local buckling of the steel tube walls under

    stress gradients, which significantly reduces the stiffness and strength of a CFST beam-column, needs to be

    considered in the inelastic analysis of the slender beam-column. Existing numerical models that do not

    consider local buckling effects may overestimate the ultimate strengths of thin-walled CFST slender beamcolumns

    under biaxial loads. This paper presents a new multiscale numerical model for simulating the structural

    performance of biaxially loaded high-strength rectangular CFST slender beam-columns accounting for progressive

    local buckling, initial geometric imperfections, high strength materials and second order effects. The inelastic

    behavior of column cross-sections is modeled at the mesoscale level using the accurate fiber element method.

    Macroscale models are developed to simulate the load-deflection responses and strength envelopes of thinwalled

    CFST slender beam-columns. New computational algorithms based on the Müller's method are developed

    to iteratively adjust the depth and orientation of the neutral axis and the curvature at the column's ends to obtain

    nonlinear solutions. Steel and concrete contribution ratios and strength reduction factor are proposed for evaluating

    the performance of CFST slender beam-columns. Computational algorithms developed are shown to be an

    accurate and efficient computer simulation and design tool for biaxially loaded high-strength thin-walled CFST

    slender beam-columns. The verification of the multiscale numerical model and parametric study are presented

    in a companion paper.

UOW Authors


  •   Liang, Qing Quan (external author)
  •   Patel, Vipulkumar I. (external author)
  •   Hadi, Muhammad

Publication Date


  • 2012

Citation


  • Liang, Q. Quan., Patel, V. Ishvarbhai. & Hadi, M. N. S. (2012). Biaxially loaded high-strength concrete-filled steel tubular slender beam-columns, Part I: Multiscale simulation. Journal of Constructional Steel Research, 75 64-71.

Scopus Eid


  • 2-s2.0-84860507351

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4611

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 64

End Page


  • 71

Volume


  • 75

Place Of Publication


  • United Kingdom

Abstract


  • The steel tube walls of a biaxially loaded thin-walled rectangular concrete-filled steel tubular (CFST) slender

    beam-column may be subjected to compressive stress gradients. Local buckling of the steel tube walls under

    stress gradients, which significantly reduces the stiffness and strength of a CFST beam-column, needs to be

    considered in the inelastic analysis of the slender beam-column. Existing numerical models that do not

    consider local buckling effects may overestimate the ultimate strengths of thin-walled CFST slender beamcolumns

    under biaxial loads. This paper presents a new multiscale numerical model for simulating the structural

    performance of biaxially loaded high-strength rectangular CFST slender beam-columns accounting for progressive

    local buckling, initial geometric imperfections, high strength materials and second order effects. The inelastic

    behavior of column cross-sections is modeled at the mesoscale level using the accurate fiber element method.

    Macroscale models are developed to simulate the load-deflection responses and strength envelopes of thinwalled

    CFST slender beam-columns. New computational algorithms based on the Müller's method are developed

    to iteratively adjust the depth and orientation of the neutral axis and the curvature at the column's ends to obtain

    nonlinear solutions. Steel and concrete contribution ratios and strength reduction factor are proposed for evaluating

    the performance of CFST slender beam-columns. Computational algorithms developed are shown to be an

    accurate and efficient computer simulation and design tool for biaxially loaded high-strength thin-walled CFST

    slender beam-columns. The verification of the multiscale numerical model and parametric study are presented

    in a companion paper.

UOW Authors


  •   Liang, Qing Quan (external author)
  •   Patel, Vipulkumar I. (external author)
  •   Hadi, Muhammad

Publication Date


  • 2012

Citation


  • Liang, Q. Quan., Patel, V. Ishvarbhai. & Hadi, M. N. S. (2012). Biaxially loaded high-strength concrete-filled steel tubular slender beam-columns, Part I: Multiscale simulation. Journal of Constructional Steel Research, 75 64-71.

Scopus Eid


  • 2-s2.0-84860507351

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4611

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 64

End Page


  • 71

Volume


  • 75

Place Of Publication


  • United Kingdom