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<p>Self-centering prestressed concrete (SCPC) frames have emerged as a prominent type of resilient structure due to their minimal residual displacement. However, in existing designs, achieving complete self-centering of the structure typically requires that the contribution of energy-dissipating devices be less than that of the initial prestress. This often results in insufficient energy dissipation capacity and stiffness during large earthquakes. This study investigates a novel self-centering prestressed concrete (SCPC) frame that employs low prestressing and slope friction to achieve a high energy dissipation ratio and improved stiffness following connection openings, thus allowing for an acceptable residual deformation (e.g. 0.5% residual drift). A seismic design method is proposed, based on the control mechanism of low prestressed slope friction hysteresis that affects the dynamic response of structures, while addressing the dual performance objectives of inter-story drift and residual inter-story drift, as well as the post-earthquake damage level of structures. Three structures were designed: partial SCPC frames with slope friction dampers (SF-PSCPC), complete SCPC frames with slope friction dampers (SF-CSCPC), and traditional complete SCPC frames with plane friction dampers (PF-CSCPC), characterized by constant friction forces. Nonlinear dynamic time-history analyses were conducted on these configurations under varying ground motion intensities. The results indicate that, compared to the PF-CSCPC frame, the SF-PSCPC frame exhibits a 47.2% increase in seismic energy dissipation and a nearly 10% reduction in the damage concentration factor, attributed to its characteristics of low prestressing and slope friction. The integration of slope friction and low prestressing can effectively mitigate unexpected damage to structural components and prestressing loss. This approach enhances the capacity for energy dissipation and promotes a more uniform pattern of inter-story deformation, thereby improving the seismic resilience of the structure.</p>

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Self-centering prestressed concrete frames with low prestressing and slope friction: design method and seismic performance

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Linjie Huang,
  • Zheng Shi,
  • Bin Zeng,
  • Huiwen Tian

摘要

Self-centering prestressed concrete (SCPC) frames have emerged as a prominent type of resilient structure due to their minimal residual displacement. However, in existing designs, achieving complete self-centering of the structure typically requires that the contribution of energy-dissipating devices be less than that of the initial prestress. This often results in insufficient energy dissipation capacity and stiffness during large earthquakes. This study investigates a novel self-centering prestressed concrete (SCPC) frame that employs low prestressing and slope friction to achieve a high energy dissipation ratio and improved stiffness following connection openings, thus allowing for an acceptable residual deformation (e.g. 0.5% residual drift). A seismic design method is proposed, based on the control mechanism of low prestressed slope friction hysteresis that affects the dynamic response of structures, while addressing the dual performance objectives of inter-story drift and residual inter-story drift, as well as the post-earthquake damage level of structures. Three structures were designed: partial SCPC frames with slope friction dampers (SF-PSCPC), complete SCPC frames with slope friction dampers (SF-CSCPC), and traditional complete SCPC frames with plane friction dampers (PF-CSCPC), characterized by constant friction forces. Nonlinear dynamic time-history analyses were conducted on these configurations under varying ground motion intensities. The results indicate that, compared to the PF-CSCPC frame, the SF-PSCPC frame exhibits a 47.2% increase in seismic energy dissipation and a nearly 10% reduction in the damage concentration factor, attributed to its characteristics of low prestressing and slope friction. The integration of slope friction and low prestressing can effectively mitigate unexpected damage to structural components and prestressing loss. This approach enhances the capacity for energy dissipation and promotes a more uniform pattern of inter-story deformation, thereby improving the seismic resilience of the structure.