Spring-stiffness model for flexible end-plate bare-steel joints in fire

K. S. Al-Jabri*, I. W. Burgess, R. J. Plank

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


This paper describes a spring-stiffness model developed to predict the behaviour of flexible end-plate bare-steel joints at elevated temperature. The joint components are considered as springs with predefined mechanical properties (i.e. stiffness and strength). They are also assumed to follow a trilinear force-displacement relationship. The elevated temperature joint's response can be predicted by assembling the stiffnesses of the components which are assumed to degrade with increasing temperatures based on the recommendations presented in the design codes. Comparison of the results from the model with existing experimental data showed good agreement. Also, the predicted degradation of the joint's stiffness and capacity compares well with the experimental results. The proposed model can be easily modified to describe the elevated temperature behaviour of other types of joint as well as joints under large rotations.

Original languageEnglish
Pages (from-to)1672-1691
Number of pages20
JournalJournal of Constructional Steel Research
Issue number12
Publication statusPublished - Dec 2005


  • Bare-steel
  • Component model
  • Connections
  • Elevated-temperature
  • Fire
  • Flexible end-plate
  • Joints
  • Spring-stiffness model

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Metals and Alloys


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