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Abstrakt:
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This paper approaches the retrofit in the bridges system of the “Alca Viaria,” or ring road, built
in the early 2000s in the Metropolitan region of Belem, in the Brazilian state of Para. The ring’s route
is 87 kilometers (km) long. It connects the Southwest and South of the state region to the metropolitan
region. It also crosses the three rivers of Amazon’s delta in the state of Para: Guama River, with 1,975
m in crossing extension; Acara River and Moju, both with 860 m in crossing extensions. The retrofit
of structural systems takes place from the high incidence of impact between barges and bridges,
occurring over the last twenty years of the structure’s service life. This results in significant damage
to the supports and leads to the partial collapse of the bridge. In the last five years, these kinds of
accidents required the retrofit of structural systems with a stayed-cable and the exchange of all strands
in the Guamá stayed-cable bridge. Besides this, it also required the construction of floating
protections on the lateral bent of the canal, the Moju, and Acará bridges. Therefore, the Department
of State and Transportation of Pará has been developing efforts to ensure the operation of the
system.
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