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Autostrade per l'Italia, controlled by infrastructure group
Atlantia, manages the section of the A10 motorway linking the
French border to the port city, where the bridge gave way on
Tuesday, killing at least 38 people.
The bridge had presented problems since soon after it was
completed in 1967 and some of the stays were reinforced as early
as the 1990s, experts have said.
Atlantia had no immediate comment on the reports in La Stampa
and Repubblica newspapers, which cited a study by engineers at
Milan's Politecnico university in November 2017.
Autostrade has said it monitored the bridge on a quarterly basis
as required by law and that it had carried out additional checks
by hiring external experts.
The newspaper reports said the university study had found that
the stays of the section of the bridge that later collapsed
reacted to vibration "in a way that does not entirely conform
with expectations and requires further investigation."
The study said the anomaly in the stays' reaction may have been
linked to corrosion of metal in some cables.
One of the peculiarities of the bridge was that its cables were
wrapped in concrete, making it hard to assess their state.
The newspapers said the company announced a 20 million euro ($23
million) tender in May this year as it planned to strengthen the
stays that had not been reinforced in the 1990s.
($1 = 0.8783 euros)
(Reporting by Valentina Za; editing by Philip Pullella)
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