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<p>Reinforced concrete (RC) buildings originally designed for low seismicity are highly vulnerable when subjected to extreme seismic forces, posing significant risks to life and property. Conventional retrofitting techniques such as fiber-reinforced polymer (FRP) wrapping and concrete jacketing have been widely studied. However, the potential of fiber-reinforced concrete (FRC) jacketing remains underexplored, and current Indian seismic design codes (IS 1893:2016 Part-1) do not address this retrofitting method. This study presents a novel approach by integrating 2% hook-end steel fiber in FRC jacketing to enhance ductility, delay plastic hinge formation, and improve seismic integrity. Unlike traditional methods, which often focus on localized strengthening, this research evaluates the global seismic performance of a ten-story RC building retrofitted with FRC jacketing across a broad range of peak ground accelerations (0.10–1.2 g). Static pushover analysis is used to generate capacity and demand curves and determine performance point of the non-retrofitted (A) and retrofitted (B) building, while nonlinear dynamic time history analysis is conducted to compare variations in roof displacement of the non-retrofitted RC building (A) under different seismic excitations. The study introduces an advanced fragility analysis framework, quantifying the probability of structural damage at different seismic intensities and performance levels. The results demonstrate that FRC jacketing significantly enhances seismic integrity, increasing base shear capacity by up to 39% and reducing the probability of structural damage by 14.5%. This pioneering study not only validates the efficacy of FRC jacketing for seismic retrofitting but also promotes its inclusion in future revisions of Indian seismic design codes (IS 1893:2016 Part-1), paving the way for safer and more resilient infrastructure in highly seismically active regions.</p>

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Effect of seismicity on the RC building retrofitted with FRC jacketing

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Shashi Shekhar Singh,
  • Aman Kumar,
  • Laxmi Kant Mishra,
  • Goutam Ghosh

摘要

Reinforced concrete (RC) buildings originally designed for low seismicity are highly vulnerable when subjected to extreme seismic forces, posing significant risks to life and property. Conventional retrofitting techniques such as fiber-reinforced polymer (FRP) wrapping and concrete jacketing have been widely studied. However, the potential of fiber-reinforced concrete (FRC) jacketing remains underexplored, and current Indian seismic design codes (IS 1893:2016 Part-1) do not address this retrofitting method. This study presents a novel approach by integrating 2% hook-end steel fiber in FRC jacketing to enhance ductility, delay plastic hinge formation, and improve seismic integrity. Unlike traditional methods, which often focus on localized strengthening, this research evaluates the global seismic performance of a ten-story RC building retrofitted with FRC jacketing across a broad range of peak ground accelerations (0.10–1.2 g). Static pushover analysis is used to generate capacity and demand curves and determine performance point of the non-retrofitted (A) and retrofitted (B) building, while nonlinear dynamic time history analysis is conducted to compare variations in roof displacement of the non-retrofitted RC building (A) under different seismic excitations. The study introduces an advanced fragility analysis framework, quantifying the probability of structural damage at different seismic intensities and performance levels. The results demonstrate that FRC jacketing significantly enhances seismic integrity, increasing base shear capacity by up to 39% and reducing the probability of structural damage by 14.5%. This pioneering study not only validates the efficacy of FRC jacketing for seismic retrofitting but also promotes its inclusion in future revisions of Indian seismic design codes (IS 1893:2016 Part-1), paving the way for safer and more resilient infrastructure in highly seismically active regions.