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Steel and Composite Structures
  Volume 30, Number 4, February25 2019 , pages 351-364

Experimental study on cyclically-damaged steel-concrete composite joints subjected to fire
Zhongnan Ye, Shouchao Jiang, Amin Heidarpour, Yingchao Li and Guoqiang Li

    Earthquake and fire are both severe disasters for building structures. Since earthquake-induced damage will weaken the structure and reduce its fire endurance, it is important to investigate the behavior of structure subjected to post-earthquake fire. In this paper, steel-concrete composite beam-to-column joints were tested under fire with pre-damage caused by cyclic loads. Beforehand, three control specimens with no pre-damage were tested to capture the static, cyclic and fire-resistant performance of intact joints. Experimental data including strain, deflection and temperature recorded at several points are presented and analyzed to quantify the influence of cyclic damage on fire resistance. It is indicated that the fire endurance of damaged joints decreased with the increase of damage level, mainly due to faster heating-up rate after cyclic damage. However, cracks induced by cyclic loading in concrete are found to mitigate the concrete spalling at elevated temperatures. Moreover, the relationship between fire resistance and damage degree is revealed from experimental results, which can be applied in fire safety design and is worthwhile for further research.
Key Words
    post-earthquake fire; composite joint; cyclic loading; fire-resistant performance; fire endurance
(1) Zhongnan Ye, Shouchao Jiang, Yingchao Li and Guoqiang Li:
College of Civil Engineering, Tongji University, Shanghai, 200092, China;
(2) Amin Heidarpour:
Department of Civil Engineering, Monash University, VIC 3800, Melbourne, Australia.

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