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The use of pre-manufactured CFRP bent bars as internal transverse reinforcement for concrete is bounded to particular structural elements. Till now it is not applied to the whole structure, as the curved or shaped reinforcing elements are not readily available, and also, the structural performance is low. They provide little flexibility as well as little confinement efficiency. This is because the bend strength at bent portions is severely reduced and also for the early bond-slip failure at overlapping regions. To address this shortcoming, winding of resin-impregnated and un-impregnated continuous carbon yarn (12k filaments) around the longitudinal reinforcement is proposed. The paper shows an investigational study on the axial compressive behavior of 17 RC columns with cross-sectional dimensions of 230 mm ✕ 230 mm and a length of 840 mm, which were reinforced longitudinally with identical CFRP bars of 12 mm diameter and transversely with different layers (4, 8, 16 and 32) of resin-impregnated & un-impregnated carbon yarn. Out of 17 columns, four columns will be heated and cooled for one hour to simulate the fire damage effect. The results indicate that carbon fibers wound around longitudinal reinforcement can effectively confine concrete in pure compression conditions.

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Experimental and Numerical Analysis on Confinement of RC Columns Using Carbon Yarn as Transverse Reinforcement

  • 会议论文

  • 发表日期：

    2026年

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  • Sayan Gajendra Mahapatra,
  • Prithvi Sangani,
  • Anil Agarwal

摘要

The use of pre-manufactured CFRP bent bars as internal transverse reinforcement for concrete is bounded to particular structural elements. Till now it is not applied to the whole structure, as the curved or shaped reinforcing elements are not readily available, and also, the structural performance is low. They provide little flexibility as well as little confinement efficiency. This is because the bend strength at bent portions is severely reduced and also for the early bond-slip failure at overlapping regions. To address this shortcoming, winding of resin-impregnated and un-impregnated continuous carbon yarn (12k filaments) around the longitudinal reinforcement is proposed. The paper shows an investigational study on the axial compressive behavior of 17 RC columns with cross-sectional dimensions of 230 mm ✕ 230 mm and a length of 840 mm, which were reinforced longitudinally with identical CFRP bars of 12 mm diameter and transversely with different layers (4, 8, 16 and 32) of resin-impregnated & un-impregnated carbon yarn. Out of 17 columns, four columns will be heated and cooled for one hour to simulate the fire damage effect. The results indicate that carbon fibers wound around longitudinal reinforcement can effectively confine concrete in pure compression conditions.