Background Metsovo Bridge is a highway bridge in the course of the east-west connection “Egnatia Odos” in the north of Greece. The 4-span, totally 540 m long prestressed concrete bridge traverses an approximately 120 m deep ravine and lies between two tunnel portals. The main span is given with 235 m. The deck is constructed to the balanced cantilever method. Both main piers are founded on shafts with diameters of 12 m and length up to 25 m. Challenge The bridge design is governed mainly by the high seismic loads in this region. It has been noted that Greece and the surrounding area is the most seismically active region of Europe. The scope of the project was monitoring the structure with respect to ground motions and other ambient dynamic activity such as dynamic loads imposed

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