The San Michele Bridge is an arched bridge with an iron truss structure that crosses the river Adda, connecting the locality of Calusco and Paderno, in the counties of Lecco and Bergamo. The bridge was built between 1887 and 1889 and it is still in operation today. It is used for a mixed road and rail traffic. The bridge was built by the "Società Nazionale delle Officine di Savigliano" and is now the property of the Italian railway network (RFI). Particularly challenging for the years in which it was built, it has a static scheme of arched bridge with upper deck and is composed of arch, beam and piers. The objective of the study illustrated in the paper is the assessment of the structural safety of the bridge in accordance with the current codes. Preliminarily to the assessment it was necessary to carry out the detailed visual inspection, the geometric survey, the characterization of the structural materials, the structural degradation, the foundations and the soils.
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