Seismic Fragility Assessment of an Existing Multi-Span RC Bridge Equipped with Risk Mitigation Systems

The vulnerability of bridges and the effectiveness suitable mitigation techniques in regions exposed to different seismic scenarios, while lacking reliable fragility assessment studies for existing bridge inventory, need focused attention. Further, several retrofit were proposed improving performance bridges, limitations such approaches further investigation. Thus, this study assesses a benchmark structure representing pre-seismic code multi-span an earthquake-prone region before after mitigate earthquake-related losses. numerical modeling selected systems verified using results previous experimental studies. Detailed three-dimensional fiber-based (3DFB) simulation models then developed assess response under effects diverse earthquake records far-field near-source scenarios both longitudinal transverse directions. obtained from inelastic pushover analyses (IPAs) incremental dynamic (IDAs) confirmed pressing actions reduce expected losses scenarios. Higher damage probabilities observed far-source events at lower intensities than their near-field counterparts. Based on probabilistic study, it is concluded that retrofitting with buckling restrained braces (BRBs) effective measure increase lateral strength overcome high curvature ductility (CD) demands bents, particularly most critical scenario. provides insight into impacts contemporary substandard presents range functions risks.