ABSTRACT
In the late seventies the bridge shown some local situations of significant structural deterioration. In fact the bridge exhibited cracks both in the parts exposed to flood water both in elements in immediate contact with the vehicular traffic, such as slab deck, girders and joints systems. The last damages were caused likely by high levels of traffic conditions because of frequency, intensity and speed of moving loads. The efficiency of foundation structures over time and the substantial structural integrity of arches were crucial to target the decision-making process to the bridge retrofit. Therefore the static verifications pointed out the possibility of the bridge retrofit according to existing requirements for the 1st category roads (Circolare No.384, 14/2/1962), whereas the bridge had been design in order to support the traffic loads required by Normale No.6081, 9/6/1945.
