Earthquakes and Structures

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Post-earthquake fire resistance of tall steel concentrically braced frames

  • Kaffash, Rasul (Department of Civil Engineering, Ferdowsi University of Mashhad) ;
  • Karamodin, Abbas (Department of Civil Engineering, Ferdowsi University of Mashhad)
  • Received : 2020.04.08
  • Accepted : 2021.06.07
  • Published : 2021.07.25
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Abstract

The fire which occurs after an earthquake causes great problems for buildings situated in moderate to high seismic regions. In this article in order to have an understanding regarding the impacts of post-earthquake fire on the structures, implementing the finite element method, the behaviour of tall steel concentrically braced frames when subjected to this type of loading was investigated. The simulation under seismic loading was done using the nonlinear time history analysis. Assuming the post-earthquake situation of the structure as the initial condition, the mechanical-thermal analysis was applied using the temperature-time diagram on the exposed elements. The analysis results showed that regardless of the earthquake record and fire scenarios for the tall steel concentrically braced frames, the fire resistance duration was short and the impacts of the previous earthquake on the structure fire resistance were not considerable.

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