The results of the dynamic
tests carried out on the approach
pedestrian bridge to Civita di Bagnoregio are
shown.
The structural elements were in bad conditions due to the carbonation of
concrete. All the external beams were damaged, the phenomenon being favoured by
the combined action of rain and wind. Several cracks could be seen in the
pillars, where the concrete cover was spliced and the reinforcement bars were
uncovered. The attention was focused on the highest five piers, which had shown
an irregular behaviour in a previous
experimental campaign. The results of the
new experimental campaign allowed to state that the structural behaviour of the
bridge was quite similar to that we could expect. Under ambient vibrations the
structure behaved as a whole, formed by the piers linked at their tops by means
of the beams. The behaviour of the piers was similar to the expected one.