Flexural behavior of fire-damaged concrete beams repaired with strain-hardening cementitious composite

Xiuling Li, Xi Lu, Jianan Qi, Yi Bao

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

This study proposes a method to repair fire-damaged concrete beams using strain-hardening cementitious composite (SHCC) and investigates their flexural behavior through full-scale tests. Eleven beams with different reinforcement ratios were fabricated. Eight beams were damaged in fire, and six of them were repaired using SHCC or basalt-fiber-reinforced polymer fabric. Three beams were used as control and not exposed to fire. All the beams were tested under four-point bending until failure. The results indicated that the proposed repairing method was capable of increasing the load-carrying capacity, stiffness, and crack resistance of fire-damaged beams. Repairing the side and bottom faces of the fire-damaged beams using SHCC increased the load-carrying capacity by 32%. To promote evaluation and repair of fire-damaged beams in engineering practices, a mechanical analysis was performed to derive engineer-friendly formulae for predicting the load-carrying capacity of repaired beams and validated against test data. This study will promote repair and evaluation of fire-damaged structures using SHCC.

Original languageEnglish
Article number114305
JournalEngineering Structures
Volume261
DOIs
StatePublished - 15 Jun 2022

Keywords

  • Fire-damaged beam
  • Flexural behavior
  • Mechanical analysis
  • Repairing
  • Spalling resistance
  • strain-hardening cementitious composite (SHCC)

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