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<p>Fire severely impairs the performance of reinforced concrete structures by lowering the concrete's strength and the embedded steel's ability to support loads. To measure damage and create efficient repair methods, this study examines the effects of controlled fire exposure on rectangular RC columns and assesses two cooling regimes, ferrocement jacketing, and finite-element simulation. RC columns were heated at temperatures of 150, 300, 450, and 600&#xa0;°C for durations of one hour with subsequent cooling, either naturally in air or by quenching with low-pressure water jets. Specimens were retrofitted with one layer of ferrocement (5% wire mesh and 95% mortar). Residual strength was evaluated by axial loading and deformation measurement using a Universal Testing Machine and Linear Variable Differential Transformers (LVDTs); ABAQUS modeling was used to simulate each of the thermal and mechanical scenarios. It was observed that at 600&#xa0;°C exposures, un-retrofitted columns lost up to 48% of peak load if the undamaged column, while the water-cooled specimens showed degradation that was 12.5% greater than the air-cooled ones due to micro-cracking induced by thermal shock. Jacketing with ferrocement recovered 25–70% of lost capacity at all temperature levels, with recovery being highest (50–70%) at 600&#xa0;°C. Numerical models matched experimental load–deformation curves within 10–15% error, validating the approach. The study demonstrates that combining air cooling with ferrocement retrofitting efficiently restores fire-damaged RC columns and that ABAQUS can reliably predict post-fire behavior. These findings offer a cost-effective, rapid rehabilitation protocol for fire-affected structures and provide benchmark data and modeling workflows for engineers tasked with post-fire assessment and repair.</p>

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A robust study on ferrocement jacketing and ABAQUS modeling for post-fire repair of reinforced concrete columns

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Anik Islam,
  • Md. Jahid Hasan Jony,
  • Anwar Hossain,
  • Mehedi Hashan Riad,
  • Avishek Banik

摘要

Fire severely impairs the performance of reinforced concrete structures by lowering the concrete's strength and the embedded steel's ability to support loads. To measure damage and create efficient repair methods, this study examines the effects of controlled fire exposure on rectangular RC columns and assesses two cooling regimes, ferrocement jacketing, and finite-element simulation. RC columns were heated at temperatures of 150, 300, 450, and 600 °C for durations of one hour with subsequent cooling, either naturally in air or by quenching with low-pressure water jets. Specimens were retrofitted with one layer of ferrocement (5% wire mesh and 95% mortar). Residual strength was evaluated by axial loading and deformation measurement using a Universal Testing Machine and Linear Variable Differential Transformers (LVDTs); ABAQUS modeling was used to simulate each of the thermal and mechanical scenarios. It was observed that at 600 °C exposures, un-retrofitted columns lost up to 48% of peak load if the undamaged column, while the water-cooled specimens showed degradation that was 12.5% greater than the air-cooled ones due to micro-cracking induced by thermal shock. Jacketing with ferrocement recovered 25–70% of lost capacity at all temperature levels, with recovery being highest (50–70%) at 600 °C. Numerical models matched experimental load–deformation curves within 10–15% error, validating the approach. The study demonstrates that combining air cooling with ferrocement retrofitting efficiently restores fire-damaged RC columns and that ABAQUS can reliably predict post-fire behavior. These findings offer a cost-effective, rapid rehabilitation protocol for fire-affected structures and provide benchmark data and modeling workflows for engineers tasked with post-fire assessment and repair.