ABSTRACT
The San Michele bridge crosses the Adda river with a 266 m total lenght continuous double deck metal riveted trussed bridge, supported by 2 masonry abutments, 3 piers on direct foundations and 4 piers on a metal trussed riveted arch with 150 m span, 37.5 m rise with the key at 85 m over the Adda river. The lower deck serves the railway line, while the upper one serves a regional road. Nowadays, 130 years after its inauguration, the bridge is still in service.This paper discusses the retrofitting design criteria considered for the safety assessment of the bridge and for the evaluation of the possibilities and limits in extending its service life.
