Seismic Fragility Assessment of RC Columns Exposed to the Freeze-Thaw Damage

Freeze–thaw damage is one of the primary causes deteriorating seismic resistance reinforced concrete (RC) structures. This paper proposed a freeze–thaw deterioration model for C30 concrete, and it can be employed to study time-varying performance aging RC columns. Next, this developed fragility analysis framework columns considering effect damage. Considering geometric parameters case-study bridge, characteristics material, uncertainties involved in structural modeling ground motions, probabilistic on was conducted. The results indicate that influence cannot ignored studying fragilities shown nonlinear increase trend as increased cycles severity state. In early stage cycles, slowly. However, closer later more significant