Título: | EXPERIMENTAL STUDY ON DUCTILITY OF REINFORCED CONCRETE BEAMS STRENGTHENED IN FLEXURE WITH CARBON FIBER COMPOSITES | |||||||
Autor: |
MARCELIA GOMES MACHADO |
|||||||
Colaborador(es): |
MARTA DE SOUZA LIMA VELASCO - Orientador EMIL DE SOUZA SANCHEZ FILHO - Coorientador |
|||||||
Catalogação: | 12/JAN/2005 | 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=5867&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=5867&idi=2 |
|||||||
DOI: | https://doi.org/10.17771/PUCRio.acad.5867 | |||||||
Resumo: | ||||||||
The objective of this experimental work is to study the
ductility of reinforced concrete beams strengthened in
flexure using externally bonded carbon fiber fabric
composites. This study presents the classic concepts of
ductility and proposes a new systematic to obtain the
ductility index, which is based on the considerations of
elastic and inelastic energy. The ductility was determined
by an energetic index, which has seen to be a more
efficient method to establish and analyze the ductility of
structural elements. The experimental program consisted of
seven beams tests. One was used as a control beam without
external reinforcement and the others were strengthened
with carbon fibers in order to resist flexural load. All
the beams had the same mechanical and geometrical
characteristics and were designed to fail in flexure. The
control beam was not strengthened and its purpose was to
compare the stiffness increase and resistance after the
strength. The strengthened beams were divided in two
groups. Group A was constituted by two beams, initially
strengthened by one and two layers of carbon fiber fabric.
Group B was formed by four beams which were strengthened
after the application of an initial load. In this group,
two beams were strengthened by one layer of carbon fiber
fabric and the other two were strengthened by two layers,
which corresponded to the same area of the others. All the
beams were cast, instrumented and tested in the Structural
and Materials Laboratory at PUC-Rio. Group B tests were
performed with the pretested beams strengthened under
constant strain, and then loaded up to rupture. The strain
was kept constant during the application and cure of the
external reinforcement. The results obtained in terms of
load, deflection, resistant moment, curvature, energetic
ductility indexes and plastic rotation were analyzed. The
study showed that the reinforcement using carbon fiber
fabric composites is an efficient technique, the beams
presented adequate ductility and the proposed energetic
ductility indexes are consistent formulae for this kind of
study.
|
||||||||