Multi-hazard resilience assessment of prestressed highway bridge

The exposure of structures to natural hazard has significant consequences on national economies and societies. A significant example of the importance of multiple hazard effects is the 2011 Tohoku (Japan) earthquake and the resulting tsunami. During this catastrophic event, the country's rail network was strongly affected: 23 stations were washed away, tracks and bridge piers were either eroded or buried, passenger and freight trains derailed. Therefore, resilience assessment of an infrastructure asset to extreme events and sequences of different hazards plays a key role on the development of suitable risk and resilience-based managing strategies. Hazard interactions and cascading effects can be classified differently, while modelling of multiple hazards is a relatively new research area [5], [6]. Scientific literature provides some examples of multi-hazard fragility curves, but very few integrated frameworks for assessing the resilience of a structure struck by multiple hazard have been treated so far. Despite many applications of resilience analysis for residential buildings, industrial facilities and bridges subject to a single catastrophic event (mainly earthquakes) are present in scientific literature, very little theory has been developed for multiple extreme events. Therefore, this paper aims to help filling this gap by showing the impact on resilience of a flood-scoured bridge struct by a seismic event.