Estrutura pré-fabricada de concreto de alto desempenho reforçado com fibras de aço para pontilhões rodoviários

Detalhes bibliográficos
Ano de defesa: 2020
Autor(a) principal: Andrade, Rodolfo Giacomim Mendes de
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Civil
UFRJ
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/11422/23192
Resumo: In general, short-span reinforced concrete highway bridges in Brazil have been neglected regarding inspection and maintenance. In this scenario, the adoption of cementitious materials is found attractive due to their resistance to different weather conditions, therefore resulting in an increased structural durability. Thus, this work aims to develop a High-Performance Fibre-Reinforced Concrete (HPFRC) short span highway bridge comprising prefabricated cellular modules, with external prestress cables inside the cross-section core, and to demonstrate it fulfil the design project requirements dismissing passive reinforcement bars, and thereby favouring durability. Given that, the constitutive laws for compression and tension behaviours were obtained from specimens moulded with HPFRC and from specimens extracted from a box girder mock-up. Two methods to determine fibre orientation factor and then predict fibre dispersion were applied, followed by results analysis aided by computer tomography images of scanned specimens. Finally, a prestressed short-span box girder mock-up was tested under shear force and the evolution of shear cracks were observed; this behaviour was also analysed via finite element numerical models. The results indicate that it is possible to dismiss both passive transverse (webs) and longitudinal (bottom flange) reinforcements and highlight the importance of the orientation factor when designing a structure with a fibre-reinforced material.