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<p>Fiber Reinforced Concrete (FRC) has gained prominence in civil engineering due to its superior mechanical properties, particularly in enhancing the seismic resilience of structures. Despite its potential, the impact of FRC on overall structural seismic performance remains underexplored, with most study confined to material and member-level assessments. Notably, fiber confinement effects are often overlooked in seismic evaluations, as widely used models like Mander’s (1988) neglect fiber contributions, leading to conservative and potentially inaccurate performance assessments. Moreover, the Indian Seismic Design Code (IS 1893:2016 Part 1) is still silent on FRC adoption. This study presents a first-of-its-kind comparative evaluation of seismic performance at both local and global levels, uniquely assessing models with and without fiber confinement effects. By integrating pushover analysis with nonlinear moment–curvature relationships, it provides deeper insights into how fiber reinforcement influences building response during seismic events. Specifically, it investigates the seismic performance of reinforced concrete (RC) buildings incorporating crimped steel fiber reinforced concrete (CSF RC) under both confined and unconfined conditions. The confinement behaviour is evaluated using Mander’s model (1988), which does not account for fiber effects, and Campione’s model (2002), which explicitly considers fiber contributions, offering a more comprehensive understanding of fiber-reinforced confinement in structural resilience. Comparative seismic analyses of RC buildings, with and without CSF (aspect ratio 82, volume fraction 1%), reveal that fiber reinforcement significantly enhances structural performance when analysed using Campione’s confinement model. Key findings demonstrate that incorporating CSF, as assessed through Campione’s confinement model compare with Mander’s confinement model, improves shear capacity by up to 17.4%, increases energy dissipation by 1.3 times, enhances global ductility by up to 6%, and delays the initiation of the plastic hinge at the collapse prevention level, ultimately leading to more resilient structures in seismic-prone regions. These results contribute to the broader field of structural engineering, expanding the knowledge base on fiber-reinforced confinement effects and offering practical applications in earthquake-resistant design. The study underscores the need to revise the Indian Seismic Design Code (IS 1893:2016 Part 1) to incorporate fiber reinforcement, enabling higher response modification factors (R-factors) and improved seismic resilience. Beyond this study, the findings offer practical applications in retrofitting strategies, sustainable fiber alternatives, and seismic code improvements, contributing to the development of ductile and energy-efficient structures in high-seismic zones of India.</p>

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Impact of fiber on the confinement of beam and column members towards seismic performance of RC building

  • 期刊论文

  • 发表日期：

    2025年3月6日

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

摘要

Fiber Reinforced Concrete (FRC) has gained prominence in civil engineering due to its superior mechanical properties, particularly in enhancing the seismic resilience of structures. Despite its potential, the impact of FRC on overall structural seismic performance remains underexplored, with most study confined to material and member-level assessments. Notably, fiber confinement effects are often overlooked in seismic evaluations, as widely used models like Mander’s (1988) neglect fiber contributions, leading to conservative and potentially inaccurate performance assessments. Moreover, the Indian Seismic Design Code (IS 1893:2016 Part 1) is still silent on FRC adoption. This study presents a first-of-its-kind comparative evaluation of seismic performance at both local and global levels, uniquely assessing models with and without fiber confinement effects. By integrating pushover analysis with nonlinear moment–curvature relationships, it provides deeper insights into how fiber reinforcement influences building response during seismic events. Specifically, it investigates the seismic performance of reinforced concrete (RC) buildings incorporating crimped steel fiber reinforced concrete (CSF RC) under both confined and unconfined conditions. The confinement behaviour is evaluated using Mander’s model (1988), which does not account for fiber effects, and Campione’s model (2002), which explicitly considers fiber contributions, offering a more comprehensive understanding of fiber-reinforced confinement in structural resilience. Comparative seismic analyses of RC buildings, with and without CSF (aspect ratio 82, volume fraction 1%), reveal that fiber reinforcement significantly enhances structural performance when analysed using Campione’s confinement model. Key findings demonstrate that incorporating CSF, as assessed through Campione’s confinement model compare with Mander’s confinement model, improves shear capacity by up to 17.4%, increases energy dissipation by 1.3 times, enhances global ductility by up to 6%, and delays the initiation of the plastic hinge at the collapse prevention level, ultimately leading to more resilient structures in seismic-prone regions. These results contribute to the broader field of structural engineering, expanding the knowledge base on fiber-reinforced confinement effects and offering practical applications in earthquake-resistant design. The study underscores the need to revise the Indian Seismic Design Code (IS 1893:2016 Part 1) to incorporate fiber reinforcement, enabling higher response modification factors (R-factors) and improved seismic resilience. Beyond this study, the findings offer practical applications in retrofitting strategies, sustainable fiber alternatives, and seismic code improvements, contributing to the development of ductile and energy-efficient structures in high-seismic zones of India.