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<p>To enhance the seismic resilience of structures, there is a persistent demand for metallic dampers that combine high energy absorption capacity with manufacturing simplicity. This paper presents a novel A-Shaped Steel Damper (ASSD), featuring monolithic elements composed of inner and outer rings, fabricated solely via laser-cutting technology to ensure high precision and manufacturing reliability. The ASSD is designed to absorb seismic energy via a combined flexural-shear yielding mechanism and can be installed in diagonal braces. An analytical model based on plastic mechanism analysis was first developed to predict the damper’s ultimate capacity in its buckling-restrained state. The cyclic behavior of four 1:2-scale specimens was then experimentally evaluated, and the influence of key geometric parameters was examined through a parametric study. Experimental results revealed that effective buckling restraint is critical for achieving stable hysteretic behavior. The restrained specimens exhibited desirable performance, with an equivalent viscous damping ratio up to 0.4, confirming the damper’s substantial capacity for seismic energy absorption. Furthermore, the proposed analytical model accurately predicts the ultimate capacity. The ASSD also displayed a remarkable energy absorption-to-mass ratio of up to 7.9&#xa0;kJ/kg. However, observations revealed localized strain concentrations at the ring junctions, highlighting a key area for future design optimization to further enhance its efficacy. Ultimately, its simple fabrication process and easy post-earthquake replaceability position the ASSD as a promising and practical solution for seismic protection.</p>

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Seismic performance evaluation of a steel-yielding damper with A-shaped elements

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Hossein Hojati,
  • Alireza Mortezaei,
  • Ali Hemmati,
  • Seayf Allah Hemati

摘要

To enhance the seismic resilience of structures, there is a persistent demand for metallic dampers that combine high energy absorption capacity with manufacturing simplicity. This paper presents a novel A-Shaped Steel Damper (ASSD), featuring monolithic elements composed of inner and outer rings, fabricated solely via laser-cutting technology to ensure high precision and manufacturing reliability. The ASSD is designed to absorb seismic energy via a combined flexural-shear yielding mechanism and can be installed in diagonal braces. An analytical model based on plastic mechanism analysis was first developed to predict the damper’s ultimate capacity in its buckling-restrained state. The cyclic behavior of four 1:2-scale specimens was then experimentally evaluated, and the influence of key geometric parameters was examined through a parametric study. Experimental results revealed that effective buckling restraint is critical for achieving stable hysteretic behavior. The restrained specimens exhibited desirable performance, with an equivalent viscous damping ratio up to 0.4, confirming the damper’s substantial capacity for seismic energy absorption. Furthermore, the proposed analytical model accurately predicts the ultimate capacity. The ASSD also displayed a remarkable energy absorption-to-mass ratio of up to 7.9 kJ/kg. However, observations revealed localized strain concentrations at the ring junctions, highlighting a key area for future design optimization to further enhance its efficacy. Ultimately, its simple fabrication process and easy post-earthquake replaceability position the ASSD as a promising and practical solution for seismic protection.