Probabilistic framework for seismic assessment of common existing RC bridge typologies

This study concerns a new probabilistic framework to evaluate road/railway bridges after an earthquake by means of analytical fragility curves and inspections on the structure: inspections are taken into account under a probabilistic point of view. The framework is set up of 6 steps and each step is investigated. In particular, the seismic assessment is performed on existing reinforced concrete (RC) bridges with a common structural scheme in Italy (multi-span simply supported girder bridges). Particular attention is given to retrofit interventions by means of Fiber Reinforce Polymer (FRP) materials and their costs. The aim is to provide useful information to owners or Institution in order to decide whether or not allowing traffic over the bridge and repairing immediately earthquake-damaged bridges. The outcomes of this framework can be used to improve and complement procedures regarding the seismic assessment of the whole road and railway networks in order to better plan emergency, post-emergency responses and a priority for an optimal budget allocation.