A carregar...
Publicação
Reabilitação de tirantes de pontes. Dois casos de estudo em Portugal
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 5.64 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
As pontes de tirantes são utilizadas, cada vez mais, como soluções arrojadas, dada a sua capa-cidade de vencer grandes vãos, associada à elegância das suas estruturas. Tal deve-se à evolução que se tem verificado na sua conceção, em particular no que diz respeito aos sistemas de atirantamento.
Na dissertação aborda-se, em primeiro lugar, a evolução dos sistemas estruturais deste tipo de pontes, com enfâse nas pontes construídas em Portugal. De seguida é sintetizada a importância das inspeções periódicas, associadas aos resultados fornecidos pelos sistemas de monitorização das obras, para prevenir e/ou detetar as anomalias existentes nas estruturas. São ainda abordados os processos e as anomalias que conduzem à degradação dos tirantes. Os diferentes processos de deterioração e substituição de tirantes em pontes são analisados em detalhe com recurso a dois casos de estudo portugueses, o da ponte Edgar Cardoso (Figueira da Foz) e o da ponte Internacional do Guadiana (Castro Marim), ambas com mais de trinta anos de vida. Nestes casos de estudo são descritas as anomalias encontradas nos tirantes, aquando das inspeções realizadas, e analisadas as soluções de reabilitação selecionadas para a substituição dos tirantes de cada uma delas, que atenderam à especificidade estrutural das obras. Por último, é feita uma análise comparativa entre as soluções de reabilitação utilizadas nos casos de estudo, tendo por base uma análise estrutural não-linear, simulando a redistri-buição de esforços associados à remoção de tirantes.
Os estudos realizados nesta área são importantes no âmbito da engenharia civil, na medida em que contribuem para aumentar a vida útil das estruturas, para além de garantirem a segurança.
Cable-stayed bridges are widely utilized as a structural solution, now more than ever, given their capacity to overcome long spans, associated with the aesthetics of their structure. This is due to the evolution in their conception, specifically with regards to the cable systems. Firstly, this thesis presents the evolution of structural systems of cable-stayed bridges, with an emphasis on Portuguese bridges. Secondly, the importance of periodic inspections and field monitoring systems is synthesized, with regards to their role on the prevention and/or detec-tion of anomalies in bridges. In addition, the processes that lead to the deterioration of the cables are also addressed. The different processes of cable deterioration and substitution are then analyzed in detail, utilizing two case studies in Portugal, the Edgar Cardoso bridge (Figueira da Foz) and the Guadiana International bridge (Castro Marim), both with over 30 years since their date of construction. Throughout the case studies, the anomalies found dur-ing the latest periodic inspections, as well as the solutions applied for cable substitution are discussed in detail, in accordance with the structural specificities of each bridge. Lastly, a com-parative analysis between the solutions used for each case study is presented, based on a non-linear structural analysis simulating the redistribution of axial forces associated with the re-moval of cables in each of the bridges. Studies in this field are important in civil engineering, as they contribute to significantly in-crease the lifespan of structures, in addition to assuring safety.
Cable-stayed bridges are widely utilized as a structural solution, now more than ever, given their capacity to overcome long spans, associated with the aesthetics of their structure. This is due to the evolution in their conception, specifically with regards to the cable systems. Firstly, this thesis presents the evolution of structural systems of cable-stayed bridges, with an emphasis on Portuguese bridges. Secondly, the importance of periodic inspections and field monitoring systems is synthesized, with regards to their role on the prevention and/or detec-tion of anomalies in bridges. In addition, the processes that lead to the deterioration of the cables are also addressed. The different processes of cable deterioration and substitution are then analyzed in detail, utilizing two case studies in Portugal, the Edgar Cardoso bridge (Figueira da Foz) and the Guadiana International bridge (Castro Marim), both with over 30 years since their date of construction. Throughout the case studies, the anomalies found dur-ing the latest periodic inspections, as well as the solutions applied for cable substitution are discussed in detail, in accordance with the structural specificities of each bridge. Lastly, a com-parative analysis between the solutions used for each case study is presented, based on a non-linear structural analysis simulating the redistribution of axial forces associated with the re-moval of cables in each of the bridges. Studies in this field are important in civil engineering, as they contribute to significantly in-crease the lifespan of structures, in addition to assuring safety.
Descrição
Palavras-chave
Pontes de tirantes Anomalias em tirantes Monitorização Inspeção Reabilitação