Earthquakes and Structures

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Numerical study on the post-earthquake fire behavior of intermediate steel moment frames

  • Parvizizadeh, Shayan (Department of Civil Engineering, Sharif University Technology-International Campus) ;
  • Kazemi, Mohammad Taghi (Department of Civil Engineering, Sharif University Technology-International Campus)
  • Received : 2019.06.30
  • Accepted : 2021.10.12
  • Published : 2022.02.25
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Abstract

As steel is highly sensitive to temperature variations, fire exposure is more destructive in the case of steel structures in comparison to the concrete ones. The performance of an intermediate three-story steel moment frame with 4 spans was studied under the service load, thermal load and post-earthquake fire in this paper. Also, the effects of passive fire-protection materials such as ordinary cement-based and fire-retardant coatings were investigated. To model and analyze the structure; Abaqus software is utilized. In order to apply the earthquake effect, the push-over analysis method is employed. Changes in the stories deflection, endurance time and growth of nonlinear regions due to losses in the steel stiffness and strength, are among the issues considered in this study. As an interesting finding, the beams protected by ordinary cement-based coating could sustain the fire exposure at least for 30 minutes in all cases. The mentioned time is increased by employing a new fire-retardant protection, which could prevent significant loss in the structure resistance against fire, even after 60 minutes of exposure to fire.

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