Abstract：As a structural solution to achieve earthquake resilience, an innovative self-centering dual system is proposed, and performance assessment is conducted based on joint probabilistic density function. This dual system is divided into two subsystems: an occupancy subsystem and a damage controlling subsystem. The occupancy subsystem provides normal occupancy function and sustains major seismic response; the damage controlling subsystem provides self-centering and energy dissipation mechanisms, bears the rest of seismic response, and controls the degree of drift concentration along the height of the structure. In order to exemplify the proposed system, a sample structure is designed according to a stiffness demand method and assessed with a probabilistic framework. This framework is based on joint probabilistic density function and takes maximum interstory drift and residual interstory drift as two random variables. Fragility curves, joint fragility matrix, as well as joint drift demand surfaces are derived. It is found that the system can effectively reduce fragility probability and the degree of drift concentration. Moreover, it is concluded that the damage controlling subsystem could reduce the maximum interstory drift and residual interstory drift of the occupancy subsystem, and keep the occupancy subsystem from weak-story failure mode.
