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Steel and Composite Structures
  Volume 43, Number 5, June10 2022 , pages 673-688
DOI: https://doi.org/10.12989/scs.2022.43.5.673
 


Numerical study on fire resistance of cyclically-damaged steel-concrete composite beam-to-column joints
Zhongnan Ye, Amin Heidarpour, Shouchao Jiang, Yingchao Li and Guoqiang Li

 
Abstract
    Post-earthquake fire is a major threat since most structures are designed allowing some damage during strong earthquakes, which will expose a more vulnerable structure to post-earthquake fire compared to an intact structure. A series of experimental research on steel-concrete composite beam-to-column joints subjected to fire after cyclic loading has been carried out and a clear reduction of fire resistance due to the partial damage caused by cyclic loading was observed. In this paper, by using ABAQUS a robust finite element model is developed for exploring the performance of steel-concrete composite joints in post-earthquake fire scenarios. After validation of these models with the previously conducted experimental results, a comprehensive numerical analysis is performed, allowing influential parameters affecting the post-earthquake fire behavior of the steel-concrete composite joints to be identified. Specifically, the level of pre-damage induced by cyclic loading is regraded to deteriorate mechanical and thermal properties of concrete, material properties of steel, and thickness of the fire protection layer. It is found that the ultimate temperature of the joint is affected by the load ratio while fire-resistant duration is relevant to the heating rate, both of which change due to the damage induced by the cyclic loading.
 
Key Words
    steel-concrete composite joints, finite-element numerical modeling, experimental results, cyclic loading, post-earthquake fire
 
Address
Zhongnan Ye:1)College of Civil Engineering, Tongji University, 200092, Shanghai, China
2)Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, 999077, Hong Kong SAR

Amin Heidarpour:3Department of Civil Engineering, Monash University, VIC 3800, Melbourne, Australia

Shouchao Jiang:College of Civil Engineering, Tongji University, 200092, Shanghai, China

Yingchao Li:College of Civil Engineering, Tongji University, 200092, Shanghai, China

Guoqiang Li:College of Civil Engineering, Tongji University, 200092, Shanghai, China
 

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