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<p>The structural integrity of beam-column connections is vital for reinforced and precast concrete structures, especially under cyclic loads like seismic forces as they operate as critical transfer points for loads, ensuring stability and resilience under the dynamic forces. Existing techniques frequently suffer from inadequate ductility, early failure, and challenges in striking a balance between cost and performance. In order to address these important issues, the study looks at the structural behavior of reinforced concrete beam-column connection systems in three different configurations: mechanical butt transition (MBT) coupler, full grout (FG), and half grout (HG). In order to evaluate and compare the cyclic performance of different types of beam-column connections, this study focuses on important characteristics like ductility (μ), energy dissipation, equivalent damping ratio, load-carrying capacity, mechanical behavior, failure modes, and degradation in strength and stiffness. The experimental findings reveal different failure mechanisms: FG, HG, and MBT failed at 4.15%, 4.01%, and 2.98%, respectively, while traditional beam-column connection systems showed bending failure at a drift of 2.27%. When compared to RBCJ's value of 5.10, the PBCJ configurations showed better performance with μ values of 5.45, 7.69, and 5.29, indicating higher stiffness retention and increased ductility. The MBT specimens exhibited superior energy dissipation compared to the RBCJ specimens, maintaining a stable dissipation pattern throughout the loading cycles. Besides, the mechanical behavior analysis revealed that the MBT specimens exhibited a 40.75% enhancement in load-carrying capacity and a 31.27% increase in drift at failure compared to the conventional specimens, highlighting the effectiveness of the MBT coupler system in enhancing structural performance.</p>

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Load carrying capacity and failure mechanisms of precast beam column joints with varying coupler connections under cyclic loading

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • A. Hemanth Kumar,
  • T. S. Sai Aravind,
  • B. Lokesh,
  • K. Karthikeyan,
  • G. Murali,
  • Siva Avudaiappan

摘要

The structural integrity of beam-column connections is vital for reinforced and precast concrete structures, especially under cyclic loads like seismic forces as they operate as critical transfer points for loads, ensuring stability and resilience under the dynamic forces. Existing techniques frequently suffer from inadequate ductility, early failure, and challenges in striking a balance between cost and performance. In order to address these important issues, the study looks at the structural behavior of reinforced concrete beam-column connection systems in three different configurations: mechanical butt transition (MBT) coupler, full grout (FG), and half grout (HG). In order to evaluate and compare the cyclic performance of different types of beam-column connections, this study focuses on important characteristics like ductility (μ), energy dissipation, equivalent damping ratio, load-carrying capacity, mechanical behavior, failure modes, and degradation in strength and stiffness. The experimental findings reveal different failure mechanisms: FG, HG, and MBT failed at 4.15%, 4.01%, and 2.98%, respectively, while traditional beam-column connection systems showed bending failure at a drift of 2.27%. When compared to RBCJ's value of 5.10, the PBCJ configurations showed better performance with μ values of 5.45, 7.69, and 5.29, indicating higher stiffness retention and increased ductility. The MBT specimens exhibited superior energy dissipation compared to the RBCJ specimens, maintaining a stable dissipation pattern throughout the loading cycles. Besides, the mechanical behavior analysis revealed that the MBT specimens exhibited a 40.75% enhancement in load-carrying capacity and a 31.27% increase in drift at failure compared to the conventional specimens, highlighting the effectiveness of the MBT coupler system in enhancing structural performance.