Navegando por Assunto "Estrutura de ponte"

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Acesso aberto (Open Access)
Fatigue lifetime of a RC bridge along the Carajás railroad
(Universidade Federal do Pará, 2012-10) SANTOS, Régis Rivo Ferreira dos; OLIVEIRA, Dênio Ramam Carvalho de
The aim of this paper is to present and discuss the results obtained with a methodology used to characterize the concrete and to evaluate the structural safety against fatigue of the reinforced concrete bridge number 50A located in the Carajás railroad. An “in situ” inspection was carried out in order to assess the evolution of damage in structural elements, with reference to information available in existing projects, calculation memory and reporting of previous inspections. Extractions of concrete testimonies, alkalinity tests, sclerometry, pacometry and laboratory tests were also performed to characterize the materials mechanically and estimate the structural behavior of the bridge under higher future loads.
Acesso aberto (Open Access)
Structural assessment of a RC Bridge over Sororó river along the Carajás railway
(Universidade Federal do Pará, 2015-04) MATOS, José Cristino Lima de; BRANCO, Vitor Hugo Lopes; MACÊDO, Alcebíades Negrão; OLIVEIRA, Dênio Ramam Carvalho de
The Carajás railway is operated by Vale SA and is used to transport the Brazilian production of iron ore mine located in the state of Pará until Itaqui harbor in Maranhão state. With 892 km in length, the railway will be doubled due to the prospect of increased production, which requires verification of the structures of bridges to ensure safety under loading up to 23% larger. The railway bridge in reinforced concrete has five hyperstatic spans with 25 m long and was built over Sororó river in the southeast of Pará. To better evaluate its structural performance under current loadings, several structural elements were monitored with strain gages and the concrete was characterized by non-destructive and destructive testing on the structure. This information was used in a computer model to estimate the future structural behavior. The methodology was satisfactory as the estimated structural performance for future loadings, meeting the recommendations of the Brazilian technical standards.