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Background/Purpose <p>Traditional seismic design relies on structural strength and stiffness, often leading to irreparable damage. This study proposes a novel multi-stage yield damper (MSYD) to address this limitation by enabling progressive energy dissipation and adaptive stiffness.</p> Methods/Design <p>The MSYD employs a gap contact mechanism to sequentially activate X-shaped steel plates, inducing bending deformation as support-end displacement increases. This staged activation enhances system stiffness and energy dissipation capacity. The study derives the damper’s mechanical model and calculation formulas, designs a tailored connecting element, and validates performance via low-cycle reciprocating pseudo-static tests.</p> Results <p>Experimental results confirm the MSYD’s excellent energy dissipation (theoretical-experimental discrepancies 10%) and stiffness superposition effects. Key findings include:</p> <p><b>Stiffness evolution</b>:&#xa0;Initial degradation followed by two-phase enhancement, enabling adaptive stiffness under varying external&#xa0;forces to mitigate structural deformation.</p> <p><b>Damping behavior</b>:&#xa0;The equivalent viscous damping coefficient (ζ) exhibits multi-phase variation (increase-decrease-reincrease),&#xa0;permitting design optimization for diverse engineering requirements.</p> Conclusion <p>The MSYD’s validated theoretical model and superior performance offer a practical solution for seismic design,&#xa0;balancing progressive energy dissipation with controllable stiffness.</p>

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Study on Mechanical Properties of Multi-Stage Yield Damper

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Xiaowei Yang,
  • Yiqiong Zhang,
  • Mengyuan Li,
  • Cong Zhao

摘要

Background/Purpose

Traditional seismic design relies on structural strength and stiffness, often leading to irreparable damage. This study proposes a novel multi-stage yield damper (MSYD) to address this limitation by enabling progressive energy dissipation and adaptive stiffness.

Methods/Design

The MSYD employs a gap contact mechanism to sequentially activate X-shaped steel plates, inducing bending deformation as support-end displacement increases. This staged activation enhances system stiffness and energy dissipation capacity. The study derives the damper’s mechanical model and calculation formulas, designs a tailored connecting element, and validates performance via low-cycle reciprocating pseudo-static tests.

Results

Experimental results confirm the MSYD’s excellent energy dissipation (theoretical-experimental discrepancies 10%) and stiffness superposition effects. Key findings include:

Stiffness evolution: Initial degradation followed by two-phase enhancement, enabling adaptive stiffness under varying external forces to mitigate structural deformation.

Damping behavior: The equivalent viscous damping coefficient (ζ) exhibits multi-phase variation (increase-decrease-reincrease), permitting design optimization for diverse engineering requirements.

Conclusion

The MSYD’s validated theoretical model and superior performance offer a practical solution for seismic design, balancing progressive energy dissipation with controllable stiffness.