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Abstract(s)
Ao longo dos anos as estruturas existentes têm sido adaptadas para novas utilizações. No entanto, devido aos condicionalismos arquitetónicos e patrimoniais, a demolição e substituição por estruturas novas, pode-se tornar pouco viável, sendo cada vez mais exequível a opção de reforçar.
A presente dissertação refere-se a uma dessas opções de reforço nomeadamente ao reforço de estruturas em betão armado com CFRP (Compósitos Reforçados com Fibras de Carbono), nomeadamente lajes e vigas. Os objetivos principais deste trabalho consistem em desenvolver uma proposta de critérios de dimensionamento de estruturas de betão armado reforçadas com CFRP tendo por base o disposto no Eurocódigo 2 comparando -a com o relatório técnico publicado “bulletin 14 - Externally bonded FRP reinforcement for RC structures”, da Fédération Internationale du Béton.
Recorrendo à revisão bibliográfica, onde estão referidos temas como as características dos materiais de um sistema FRP, as suas técnicas de reforço e com uma exposição do comportamento das vigas reforçadas à flexão, particularmente no seu comportamento mecânico e modos de ruína associados a este tipo de reforço.
Apresentam-se duas metodologias de cálculo para dimensionamento deste tipo de reforço para os diferentes estados limites, e aplicam-se a cada uma das metodologias de cálculo a uma viga com necessidade de reforço à flexão e ao corte, devido a um aumento de esforços provocado pelo aumento da sobrecarga.
Desenvolve-se um estudo experimental onde se pretende avaliar a eficácia de um sistema de reforço à flexão com compósitos de CFRP colado externamente a uma viga e com diferentes taxas de reforço.
Over the years, existing structures have been adapted to new uses. However, due to architectural and historical constraints, the dismantling and replacement by new structures, may become impractical, being more and more feasible the option of reinforce. The present dissertation, refers to the study of reinforced concrete structures reinforced with CFRP (Composites Reinforced with Carbon Fibers), namely slabs and beams. The main objectives of this task, consists in develop a proposal of design criteria for reinforced concrete structures reinforced with CFRP, based on the Eurocode 2, comparing it with the published technical report “bulletin 14 - Externally bonded FRP reinforcement for RC structures”, of Fédération Internationale du Béton. Using the available bibliography, where are referred themes like, the technical features of the materials of one FRP system, their strengthening techniques and with a display of the behavior of beams strengthened in bending, particularly, in their mechanical behavior and failure modes associated to this type of strengthening. Thus, were presented the two calculation methodologies for design of this type of strengthening for the different limit states, after, was applied each one of the proposed calculation methodologies to a beam, with needs of strengthening to bending and cut, due to an increase of efforts caused by increased overload.
Over the years, existing structures have been adapted to new uses. However, due to architectural and historical constraints, the dismantling and replacement by new structures, may become impractical, being more and more feasible the option of reinforce. The present dissertation, refers to the study of reinforced concrete structures reinforced with CFRP (Composites Reinforced with Carbon Fibers), namely slabs and beams. The main objectives of this task, consists in develop a proposal of design criteria for reinforced concrete structures reinforced with CFRP, based on the Eurocode 2, comparing it with the published technical report “bulletin 14 - Externally bonded FRP reinforcement for RC structures”, of Fédération Internationale du Béton. Using the available bibliography, where are referred themes like, the technical features of the materials of one FRP system, their strengthening techniques and with a display of the behavior of beams strengthened in bending, particularly, in their mechanical behavior and failure modes associated to this type of strengthening. Thus, were presented the two calculation methodologies for design of this type of strengthening for the different limit states, after, was applied each one of the proposed calculation methodologies to a beam, with needs of strengthening to bending and cut, due to an increase of efforts caused by increased overload.
Description
Keywords
Betão armado Dimensionamento e verificação de segurança CFRP Procedimentos para projeto Reinforced concrete Design and safety concept Design procedure
Citation
Publisher
Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto