Residual capacity of fire-exposed concrete-filled steel hollow section columns

David Rush, Luke Bisby, Martin Gillie, Allan Jowsey, Barbara Lane

Research output: Contribution to journalArticlepeer-review


Concrete filled steel hollow structural (CFS) sections are an increasingly popular means to support large compressive loads in buildings. Whilst the response of unprotected CFS sections during a fire is reasonably well researched, their post-fire residual structural performance is less well established. A better understanding of the response of fire-damaged CFS columns is needed to enable better performance-based structural fire engineering of buildings incorporating CFS sections. This paper presents post-fire residual compression tests on unprotected and protected CFS columns along with control tests on six unheated sections. The tests confirm that as the maximum exposed temperature within the cross-section increases, the residual strength capacity, ductility and axial-flexural stiffness decrease. The data are subsequently used to assess the ability to predict the residual capacity of CFS columns after fires, using available post-fire material models and in-fire and ambient structural models. (C) 2015 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)550-563
Number of pages14
JournalEngineering Structures
Early online date3 Jul 2015
Publication statusPublished - 1 Oct 2015


  • Fire resistance
  • Concrete filled steel hollow sections
  • CFS
  • Post-fire residual strength
  • Intumescent coatings
  • Property protection
  • Predictions
  • Columns


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