Abstract
The French railway network includes over 30 000 km of railway tracks and more than 5000 metallic bridges. Some of them have been in service for over a century and they need adapted measures for their maintenance. Due to the increase of rolling speed and axle load, fatigue is one of the main phenomena to take into account in order to extend the safe service life of metallic bridges. In order to better understand how old bridges behave, a specific Agressiveness Index (AI) has been defined and enables to compare the effect of different rolling stocks on the mechanical behaviour of stringers. This index was tested fot different historical type trains. For these calculations, a set of real stringers was considered, including different periods of construction, different spans and inertias. The SIA fatigue curve with Δσc=80MPa has been chosen taking into account historical allowable fatigue stress. The calculation model of stresses in stringers of this study shows a good agreement with the SNCF historical inventory of repairs.
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