Post-fire seismic behavior of two-bay two-story frames with high-performance fiber-reinforced cementitious composite joints

Xiuling Li, Zhenbo Xu, Yi Bao, Zhengang Cong

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

High-performance fiber-reinforced cementitious composite (HPFRCC) has potential to greatly improve the fire resistance and seismic behavior of concrete structures. This paper reports an experimental investigation on post-fire seismic behavior of two-bay two-story frames with HPFRCC joints. Four reinforced concrete frames were fabricated; three of them were tested in compartment fire for 60 min. The fire was regulated following ISO-834 temperature curve. Two different fire scenarios (one- and two-bay fire) were investigated. Two frames were made of monotonic conventional concrete; the other two frames had HPFRCC joints. Each frame was tested under a constant vertical load and a pseudo-static cyclic horizontal load with increased magnitude until the frame failed. The effects of the HPFRCC and fire scenarios on the failure mechanism, hysteretic loops, envelope curve, stiffness degradation, and energy dissipation of the frames were evaluated. The experimental results revealed that the fire exposure reduced the load capacity and deformability of the frames. In the two-bay fire scenario, the use of HPFRCC joints increased the post-fire load capacity by 11%, ultimate deformation by 6%, initial stiffness by 30%, and energy dissipation by 21%. The cyclic behavior of the frame in one-bay fire was better than that in two-bay fire. The frames with HPFRCC joints demonstrated better cyclic behaviors than the virgin reinforced concrete frame.

Original languageEnglish
Pages (from-to)150-159
Number of pages10
JournalEngineering Structures
Volume183
DOIs
StatePublished - 15 Mar 2019

Keywords

  • Fire damage
  • Frame
  • High-performance fiber-reinforced cementitious composites
  • Multi-hazard evaluation
  • Post-fire performance
  • Seismic behavior

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