Seismic resilience assessment of self-centering prestressed concrete frame with different energy dissipation ratio and second stiffness

Abstract

This paper presents the effects of two key parameters, energy dissipation ratio and second stiffness, on the seismic performance and resilience of self-centering prestressed concrete (SCPC) frames. The dynamic parametrical analyses under different earthquake intensities and fragility analyses under different performance level have been carried out, the maximum drift (MD) - residual drift (RD) joint probability density method suitable for SCPC structure was proposed, and the damage distribution law of structural members and typical non-structural members was analyzed. The influence of different parameters on the resilience indicators of SCPC framework was studied based on the FEMA P-58 resilience assessment framework. The results indicate that the main structure of the SCPC frame remained intact, while the acceleration-sensitive non-structural components accounted for more than 80% of the total repair cost and repair time. Increasing the second stiffness could reduce the high-order modal effect of the SCPC structure response and the loss in the upper part of the SCPC frame. Increasing energy dissipation ratio could reduce the maximum response of the structure and improve the building resilience. When the energy dissipation ratio was increased from 0.2 to 0.8, the repair cost and repair time were decreased by 13.1% and 17.2%, respectively, under maximum considered earthquake (MCE), and the residual displacement of the structure was still within the re-centering limit of 0.2%.