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<p>O-shaped yielding dampers (OSDs) are known for their favorable seismic behavior due to their operational simplicity. This study numerically investigated the cyclic behavior of OSDs using a calibrated model, considering the damper radius, length, and thickness as parametric variables. Analytical equations were proposed to estimate the elastic stiffness and yield force. Subsequently, approximate equations were presented to calculate the ultimate strength, effective stiffness, and energy absorption, offering efficient tools for damper design. The influence of damper dimensions on the equivalent viscous damping ratio was also investigated. The effect of the OSD damper on steel moment frames was also investigated under cyclic loading. Results indicated that energy absorption, effective stiffness, and ultimate strength increased with damper length and thickness, and decreased with radius. The elastic stiffness is directly proportional to the thickness-to-radius ratio. Furthermore, changes in damper thickness had the most significant effect on the results. The OSD damper increased frame strength by 57%, elastic stiffness by 2.1 times, and doubled energy dissipation.</p>

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Analytical and Numerical Investigation of the Cyclic Behavior of O-Shaped Dampers

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Behnam Mahmoodi,
  • Mehrdad Rasoulitabar,
  • Kambiz Cheraghi

摘要

O-shaped yielding dampers (OSDs) are known for their favorable seismic behavior due to their operational simplicity. This study numerically investigated the cyclic behavior of OSDs using a calibrated model, considering the damper radius, length, and thickness as parametric variables. Analytical equations were proposed to estimate the elastic stiffness and yield force. Subsequently, approximate equations were presented to calculate the ultimate strength, effective stiffness, and energy absorption, offering efficient tools for damper design. The influence of damper dimensions on the equivalent viscous damping ratio was also investigated. The effect of the OSD damper on steel moment frames was also investigated under cyclic loading. Results indicated that energy absorption, effective stiffness, and ultimate strength increased with damper length and thickness, and decreased with radius. The elastic stiffness is directly proportional to the thickness-to-radius ratio. Furthermore, changes in damper thickness had the most significant effect on the results. The OSD damper increased frame strength by 57%, elastic stiffness by 2.1 times, and doubled energy dissipation.