Reinforced　Concrete　(RC)　bridges　are　a　key　elements　for　any　transportation　network,　so　that　their　safety　and　serviceability　is　of　crucial　importance　especially　after　the　occurrence　of　a　seismic　event.　Frequently,　RC　bridges　are　exposed　to　the　action　of　aggressive　chemicals,　such　as　in　marine　or　in　cold　climate　environments,　for　the　presence　of　chloride　ions,　either　due　to　the　salty　water　or　the　use　of　deicing　salt.　Generally　those　aggressive　environmental　actions　affect　the　steel　rebars　inducing　corrosion　phenomena　with　a　degradation　the　mechanical　properties　of　reinforcement.　In　this　paper　some　modeling　issues　related　to　corroded　RC　piers　are　presented　and　discussed,　with　particular　emphasis　to　their　seismic　assessment.