Egnatia Motorway in Northern Greece has a 670km main axis length and comprises a high number of

concrete structures: 210 twin bridges with a total length of 80km and 79 twin tunnels with a total length of 50km.

The Egnatia Motorway crosses high seismicity prone areas. Therefore, damages due to intensive seismic events are

expected and should be considered for the life-cycle analysis and management of the motorway structural

components, especially bridges and tunnels.

The present paper focuses on the processes followed by the Egnatia Odos S.A. company in the seismic risk

assessment of bridges. This is based on in-house performed monitoring and on analytical determination of seismic

fragility curves for all the structurally representative bridges of the motorway. Egnatia bridges were classified to

structurally representative categories depending on the structural type of the superstructure (box beam, slab,

beams), the substructure (hollow piers, walls, frames or single massif columns) and their interconnection

(monolithical or through bearings). For all these bridge-classes their seismic fragility curves were analytically derived

Using these fragility curves, the seismic risk assessment of the newly established bridges is supported

through a seismic risk assessment software. This combines the seismic hazard model of the area along the motorway

and the vulnerability functions computationally determined for all the representative bridges. Furthermore, in this

paper the results from different seismic scenarios and probabilistic analyses are shown. Based on these results, the

typical expectations for the maintenance lifecycle analysis of the motorway bridges are updated considering the

seismic risk.