Post-heating response of concrete-filled steel tubular columns under sustained loads

C. Ibañez*, L. Bisby, D. Rush, M. L. Romero, A. Hospitaler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Concrete-filled steel tubular (CFST) columns can generally be expected to better resist elevated temperatures as compared to unfilled steel hollow sections, whose evaluation after a fire is limited by the resulting deformation. A better understanding of the behaviour of CFST columns after a fire, which is dominated by the maximum temperature achieved by the concrete infill and plasticity of the steel, is required to properly estimate their residual strength and deformation and to adopt a reasonable strategy with minimum post-fire repair. In this paper, a fibre beam model for the simulation of the post-heating response of concrete-filled steel tubular (CFST) columns is presented. First, the model is validated against experimental results and subsequently it is employed to analyse the post-heating response of circular CFST columns under sustained loads. In reality, during a fire, the columns support load even during the cooling phase of a fire, so it is important to consider this loading condition when predicting the post-fire behaviour. The analysis presented in this paper comprises three stages: heating, cooling and post-fire (under sustained load) conditions. The model considers realistic features typical of the fire response of CFST columns, such as the existence of a gap conductance at the steel-concrete interface and the sliding and separation of the steel tube and the concrete. Based on the model, the response of CFST columns after heating is investigated via parametric analysis.

Original languageEnglish
Early online date29 Apr 2019
Publication statusE-pub ahead of print - 29 Apr 2019


  • Concrete-filled steel tubular columns
  • Fibre beam model
  • Post-fire
  • Post-heating response
  • Residual capacity


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