Cold-formed steel portal frames in fire: full-scale testing and finite element analysis

R. P. D. Johnston, J. B. P. Lim, H. H. Lau, Y. Xu, M. Sonebi, C. G. Armstrong, C. Switzer, C. C. Mei

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A full-scale, non-uniform natural fire test on a cold-formed steel portal frame building is described. The results of the fire test are used to validate a non-linear, elasto-plastic, finite element shell idealisation, for the purposes of later forming the basis of a performance-based design approach for cold-formed steel portal frames at elevated temperatures. The test building had a span of 8m, height-to-eaves of 2.2m, length of 10m, with a frame spacing of 2.5m. The member and connections of the frame were constructed entirely from cold-formed steel and the eaves and apex joints were classified as semi-rigid. In order to reduce the influence of diaphragm action, the cladding was detailed to act independently from the frames. The frame collapsed with an eventual inwards asymmetrical collapse mechanism at 714°C, with collapse being due to member buckling rather than failure of the screws or joints. The collapse temperature predicted using the shell idealisation was 682°C, with a deformed shape similar to that observed in the fire test.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalThe Structural Engineer
Volume92
Issue number10
Publication statusPublished - 1 Oct 2014

Keywords

  • fire test
  • cold formed steel
  • collapse mechanism

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