Seismic fragility assessment for an existing RC frame-wall dual system building with corroded bars

This work analyses the seismic response of an existing Reinforced Concrete (RC) frame-wall dual system building with corroded bars. For a given exposure class, pushover analyses are performed for different time periods on the Finite Element (FE) model of the structure. The nonlinear behaviour of RC walls with corroded reinforcement is taken into account through PARC_CL_2.1 crack model. Time-dependent fragility curves are then obtained through a procedure based on incremental static analysis. Damage threshold levels are identified on the capacity curves as a function of the yielding and ultimate displacements, according to a procedure proposed in the framework of Risk-UE project. To define the threshold corresponding to complete damage, ultimate chord rotation of columns is properly reduced on the basis of the corrosion level achieved in the longitudinal reinforcement.