Logo PUC-Rio Logo Maxwell
ETDs @PUC-Rio
Estatística
Título: MECHANICAL BEHAVIOR OF STATICALLY INDETERMINATE REINFORCED CONCRETE BEAMS WITH GFRP BARS AND STEEL FIBERS
Autor: THIAGO FIORAVANTI
Colaborador(es): FLAVIO DE ANDRADE SILVA - Orientador
DANIEL CARLOS TAISSUM CARDOSO - Coorientador
Catalogação: 23/JUL/2024 Língua(s): PORTUGUESE - BRAZIL
Tipo: TEXT Subtipo: THESIS
Notas: [pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio.
[en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio.
Referência(s): [pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=67418&idi=1
[en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=67418&idi=2
DOI: https://doi.org/10.17771/PUCRio.acad.67418
Resumo:
Pultruded bars made of fiber-reinforced polymers, especially glass fibers (GFRP), have been gaining ground as a reinforcement of structural elements, mainly due to the unique characteristics of FRP composites, such as high mechanical strength, low specific weight, and non-corrosive nature. However, unlike steel reinforcement, in general, FRP bars behave with anisotropic, non-homogeneous and linear elastic properties, which can result in a different force transfer mechanism between the reinforcement and the concrete. These properties allied to its low young modulus can lead to a scenario of structural elements with greater crack openings and greater displacements when compared to steel bars reinforced elements. From this perspective, this work intends to evaluate, from an experimental program, the structural behavior of concrete elements reinforced with pultruded GFRP bars and with addition of steel fibers. Six statically indeterminate beams were subjected to bending and the influence of the addition of steel fibers in ratios of 40 and 80 kg/m3 with reinforcement rate varying between 181 per cent and 368 per cent regarding the balanced rate was evaluated. Structural tests were carried out to investigate the crack formation pattern, deflections, stress transfer and the variation in the failure mode of the elements. The steel fiber reinforced concrete (SFRC) was characterized by means of a three-point bending test, according to NBR16940, to obtain the residual strength used in the design of the elements. The SFRC showed both deflection softening and deflection hardening behavior, in addition to the post-cracking strength improvement with the increase of the fiber content. The structural tests carried out on statically indeterminate beams showed an increase of up to 42 per cent in the load bearing capacity of beams with steel fiber reinforced concrete, in addition to lower deflections and reduced crack width. However, the GFRP stirrups, even combined with the addition of steel fibers to concrete, proved to be insufficient to withstand the influence of the shear force, leading the beams to shear failure.
Descrição: Arquivo:   
COMPLETE PDF