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<p>The seismic performance of precast concrete shear walls connected using two distinct coupler systems: threaded couplers (PCW-TH) and mechanical butt-transition (MBT) couplers (PCW-MBT), through a combined experimental and numerical approach is investigated. The novelty of this research lies in its direct comparative evaluation of these coupler types under cyclic lateral loading, an area with limited prior investigation, providing new insights into their respective hysteretic behavior, crack propagation, energy dissipation, and overall structural integrity. Results demonstrate that both coupler systems are capable of effectively transferring lateral loads; however, the threaded coupler system exhibited superior energy dissipation (142.99 kN-mm) compared to the MBT coupler system (130.71 kN-mm), highlighting its enhanced deformation capacity under repeated loading. The PCW-TH showed pronounced pinching behavior at larger displacements due to increased concrete deformation near the connection, while the PCW-MBT system demonstrated stiffer response with minimal pinching, though localized concrete crushing was observed at the coupler interface. Peak lateral load capacities were comparable (39.7 kN&#xa0;for PCW-TH and 49.5 kN&#xa0;for PCW-MBT). Finite element simulations in ABAQUS correlated well with experimental findings, although some deviations were noted in modeling pinching effects and energy dissipation. This comparative analysis provides valuable guidance for selecting coupler systems in seismic precast design and enhances the understanding of connection-specific deformation mechanisms.</p>

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Comparative Seismic Vulnerability of Ventilated Precast Concrete Shear Walls: Experimental and Numerical Analyses of Mechanical Coupler

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • A. Hemanth Kumar,
  • K. Karthikeyan

摘要

The seismic performance of precast concrete shear walls connected using two distinct coupler systems: threaded couplers (PCW-TH) and mechanical butt-transition (MBT) couplers (PCW-MBT), through a combined experimental and numerical approach is investigated. The novelty of this research lies in its direct comparative evaluation of these coupler types under cyclic lateral loading, an area with limited prior investigation, providing new insights into their respective hysteretic behavior, crack propagation, energy dissipation, and overall structural integrity. Results demonstrate that both coupler systems are capable of effectively transferring lateral loads; however, the threaded coupler system exhibited superior energy dissipation (142.99 kN-mm) compared to the MBT coupler system (130.71 kN-mm), highlighting its enhanced deformation capacity under repeated loading. The PCW-TH showed pronounced pinching behavior at larger displacements due to increased concrete deformation near the connection, while the PCW-MBT system demonstrated stiffer response with minimal pinching, though localized concrete crushing was observed at the coupler interface. Peak lateral load capacities were comparable (39.7 kN for PCW-TH and 49.5 kN for PCW-MBT). Finite element simulations in ABAQUS correlated well with experimental findings, although some deviations were noted in modeling pinching effects and energy dissipation. This comparative analysis provides valuable guidance for selecting coupler systems in seismic precast design and enhances the understanding of connection-specific deformation mechanisms.