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This study investigates a novel hybrid confinement method for high-strength concrete (HSC) columns, combining conventional steel hoops with uncoated carbon fibers (CFM) internally integrated within the reinforcement cage. The hybrid system is designed to overcome limitations of traditional confinement methods, such as external FRP, particularly under fire conditions. An analytical model was developed to predict the structural behavior of HSC columns under fire exposure, eliminating the need for iterative lateral strain computations. Experimental tests were conducted on HSC column specimens under ambient and elevated temperatures to validate the model, and the model demonstrated good agreement with the experimental results. The hybrid system exhibited significant structural efficiency and fire resistance, with CFM confinement maintaining performance even under prolonged fire exposure, unlike epoxy-based FRP systems. The findings offer practical insights for designing fire-resistant HSC columns with reduced reliance on external insulation.

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Assessment of Hybrid Confinement Methods Combining Carbon Fibers and Steel Hoops for HSC: Internal Uncoated Fibers vs. External FRP

  • 会议论文

  • 发表日期：

    2026年

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  • Yedidya M. Shachar,
  • Rami Eid,
  • Avraham N. Dancygier

摘要

This study investigates a novel hybrid confinement method for high-strength concrete (HSC) columns, combining conventional steel hoops with uncoated carbon fibers (CFM) internally integrated within the reinforcement cage. The hybrid system is designed to overcome limitations of traditional confinement methods, such as external FRP, particularly under fire conditions. An analytical model was developed to predict the structural behavior of HSC columns under fire exposure, eliminating the need for iterative lateral strain computations. Experimental tests were conducted on HSC column specimens under ambient and elevated temperatures to validate the model, and the model demonstrated good agreement with the experimental results. The hybrid system exhibited significant structural efficiency and fire resistance, with CFM confinement maintaining performance even under prolonged fire exposure, unlike epoxy-based FRP systems. The findings offer practical insights for designing fire-resistant HSC columns with reduced reliance on external insulation.