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<p>Estimating hysteretic damping is essential for the direct displacement-based design (DDBD) of buckling-restrained braced frames (BRBFs). This study assesses the hysteretic damping ratio of a 25-story dual system consisting of a special moment-resisting frame and buckling-restrained braces (BRBs), designed using the DDBD method. Nonlinear cyclic and time-history analyses are performed using 11 near-field ground motions. A ductility-dependent expression for the equivalent damping ratio is proposed, calibrated from cyclic analysis. For seismic loading, a logarithmic relationship between the hysteretic damping ratio and the dissipated plastic strain energy is derived (R² = 0.96). Sensitivity analysis using the Tornado diagram method reveals that dead load, elastic damping, and beam yield stress are the most influential parameters. Results show that the mean hysteretic damping ratio increases from 3.2% at PGA = 0.3&#xa0;g to 13.7% at PGA = 1.0&#xa0;g. The proposed relationships improve the accuracy of displacement-based seismic design for high-rise BRB-MRF dual systems.</p>

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Assessment of hysteresis damping ratio of a structure with buckling- restrained brace designed using the direct displacement method

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Majid Moradi,
  • Sadegh Rezaei

摘要

Estimating hysteretic damping is essential for the direct displacement-based design (DDBD) of buckling-restrained braced frames (BRBFs). This study assesses the hysteretic damping ratio of a 25-story dual system consisting of a special moment-resisting frame and buckling-restrained braces (BRBs), designed using the DDBD method. Nonlinear cyclic and time-history analyses are performed using 11 near-field ground motions. A ductility-dependent expression for the equivalent damping ratio is proposed, calibrated from cyclic analysis. For seismic loading, a logarithmic relationship between the hysteretic damping ratio and the dissipated plastic strain energy is derived (R² = 0.96). Sensitivity analysis using the Tornado diagram method reveals that dead load, elastic damping, and beam yield stress are the most influential parameters. Results show that the mean hysteretic damping ratio increases from 3.2% at PGA = 0.3 g to 13.7% at PGA = 1.0 g. The proposed relationships improve the accuracy of displacement-based seismic design for high-rise BRB-MRF dual systems.