Seismic performance and resilience assessment of friction damped self-centering prestressed concrete frames

This study evaluated the hysteretic behavior, seismic performance, and resilience of friction based (FD) self centering prestressed concrete (SCPC) frames. First, an experimental study on a one-story one-bay FD-SCPC frame was conducted. Second, dynamic analyses and fragility analyses of multi-story FD-SCPC frames with different design parameters under fortification and rare earthquakes were conducted. Finally, considering the repair cost and repair time as criteria, the resilience assessment of structures employing FD-SCPC frames was performed. The analyses results indicated that the FD-SCPC frames achieved the expected hysteretic behavior in terms of recentering capacity and mitigated damages in the structural components. Under fortification earthquakes, the FD-SCPC frames showed seismic behavior and resilience similar to those of cast-in-place reinforced concrete frames. Under rare earthquakes, owing to the unique rocking mechanism and frictional energy dissipating mechanism, the damage of the structural components of the FD-SCPC frames was much less than that of the traditional cast-in place concrete frames. Considering the repair cost and time for the structural and nonstructural components, the seismic behavior and resilience of the FD-SCPC frame were found to be significantly superior to those of the cast-in-place reinforced concrete frames.