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<p>Hybrid seismic control systems integrating buckling-restrained braces (BRB) and viscoelastic dampers (VED) demonstrate superior performance compared to single-type damper systems. This study introduces a novel displacement-based design method that optimizes the capacities of both damper types through equivalent stiffness balancing of the controlled structural system. The approach utilizes the storage stiffness contribution of dampers to achieve balanced inter-story stiffness distribution. Six hybrid arrangement schemes, including two single-type damper system and four hybrid damper system, are comprehensively evaluated for elasto-plastic steel frames. Numerical analyses of benchmark structures reveal that design method is universally applicable across all hybrid schemes, consistently delivering the desired maximum drift control performance. Results indicate that VED-only system yields residual drift ratios approximately 25% lower than BRB-only system, and hybrid systems exhibit residual drifts and floor accelerations intermediate between those in BRB-only and VED-only systems. The achieved stiffness balance may deviate under seismic excitations differing from the design level intensity due to the amplitude-dependent stiffness variation of BRBs, highlighting the need for performance evaluations across multiple earthquake intensity levels. The results validate the method’s efficacy in concurrent damper capacity design and highlight the importance of scheme-specific optimization. This work provides a foundational framework for advancing hybrid damper applications in seismic-resistant design.</p>

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Stiffness-Based Optimization of Hybrid Hysteretic and Viscoelastic Dampers for Steel Structures

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Jianan Cai,
  • Bo Li,
  • Wuchuan Pu

摘要

Hybrid seismic control systems integrating buckling-restrained braces (BRB) and viscoelastic dampers (VED) demonstrate superior performance compared to single-type damper systems. This study introduces a novel displacement-based design method that optimizes the capacities of both damper types through equivalent stiffness balancing of the controlled structural system. The approach utilizes the storage stiffness contribution of dampers to achieve balanced inter-story stiffness distribution. Six hybrid arrangement schemes, including two single-type damper system and four hybrid damper system, are comprehensively evaluated for elasto-plastic steel frames. Numerical analyses of benchmark structures reveal that design method is universally applicable across all hybrid schemes, consistently delivering the desired maximum drift control performance. Results indicate that VED-only system yields residual drift ratios approximately 25% lower than BRB-only system, and hybrid systems exhibit residual drifts and floor accelerations intermediate between those in BRB-only and VED-only systems. The achieved stiffness balance may deviate under seismic excitations differing from the design level intensity due to the amplitude-dependent stiffness variation of BRBs, highlighting the need for performance evaluations across multiple earthquake intensity levels. The results validate the method’s efficacy in concurrent damper capacity design and highlight the importance of scheme-specific optimization. This work provides a foundational framework for advancing hybrid damper applications in seismic-resistant design.