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<p>A practical and reliable self-centering rocking wall (SCRW) equipped with friction devices is developed to enhance the seismic resilience of existing reinforced concrete (RC) frame buildings. The configuration of the SCRW and the hysteretic behavior of its self-centering friction damper are presented. A distributed parameter model of the frame-SCRW structure is then established to investigate the influence of key SCRW parameters on structural seismic demands. Subsequently, a performance-based seismic retrofit method using the SCRW is proposed and applied to strengthen 6- and 12-story RC frames. The retrofit effectiveness is evaluated through deterministic analyses and fragility assessments incorporating uncertainties in both structural parameters and ground motion inputs. The results indicate that inter-story drifts of the frame-SCRW structure tend to equalize across all stories as the stiffness of the SCRW increases. The seismic forces resisted by the frame system decrease as the base bending moment of the SCRW increases, while the seismic capacity of the frame-SCRW structure increases with greater flexural capacity of the SCRW's self-centering hinge. The proposed retrofit method effectively achieves the design objectives without repeated iterations and substantially enhances the post-earthquake recovery capacity of the retrofitted structures.</p>

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Seismic retrofit of RC frames using self-centering rocking walls: a performance-based design method and probabilistic fragility assessment

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Jishuai Wang,
  • Tong Guo,
  • Ke Du

摘要

A practical and reliable self-centering rocking wall (SCRW) equipped with friction devices is developed to enhance the seismic resilience of existing reinforced concrete (RC) frame buildings. The configuration of the SCRW and the hysteretic behavior of its self-centering friction damper are presented. A distributed parameter model of the frame-SCRW structure is then established to investigate the influence of key SCRW parameters on structural seismic demands. Subsequently, a performance-based seismic retrofit method using the SCRW is proposed and applied to strengthen 6- and 12-story RC frames. The retrofit effectiveness is evaluated through deterministic analyses and fragility assessments incorporating uncertainties in both structural parameters and ground motion inputs. The results indicate that inter-story drifts of the frame-SCRW structure tend to equalize across all stories as the stiffness of the SCRW increases. The seismic forces resisted by the frame system decrease as the base bending moment of the SCRW increases, while the seismic capacity of the frame-SCRW structure increases with greater flexural capacity of the SCRW's self-centering hinge. The proposed retrofit method effectively achieves the design objectives without repeated iterations and substantially enhances the post-earthquake recovery capacity of the retrofitted structures.