Consolos de concreto moldados em duas etapas: influência do tratamento da interface e da adição de fibras de aço
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Data
2012-08-29
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Universidade Federal de Goiás
Resumo
Concrete corbels are among the most used components to connect precast elements. Series
production is often prejudiced by the necessity of making corbels in different positions in
precast elements. To reduce this obstacle and rationalize the production, execution of concrete
corbels cast in two stages can be a good alternative. The researche reported here intended to
evaluate different procedures of making concrete corbels cast in two stages, being column
cast firstly and, after removing formwork, corbels can be cast. Concrete corbels with and
without steel fibers, both with horizontal stirrups and with steel fibers replacing it, with
varying the treatment of joint and the shape of the connect the main steel bars to the column
were analyzed. To do so, experimental and analytical analyses of concrete corbels cast
monolithically and in two distinct phases were carried out. In the tests, the strength, vertical
and horizontal displacements in relation to the column, the opening of cracks and strains of
main steel and horizontal stirrups were determined. From these tests it was observed that the
ultimate strength of monolithic corbels increased significantly when steel fibers were added to
concrete, even when they replaced the horizontal stirrups, but this increase did not occur in
concrete corbels cast in two stages. However, it was observed that steel fibers could replace
the horizontal stirrups without damage to the bearing capacity. Besides, the presence of
horizontal stirrups increased the ultimate strength of the concrete corbels without steel fibers
cast in two stages. It was also observed that the opening of the joint between the corbel and
the column was also influenced by the presence of horizontal stirrups for concrete corbels cast
in two stages and monolithic concrete corbels. In the other hand, steel fibers added to the
concrete did not affect the opening of the joint corbel-column of corbel cast in two stages, but
substantially reduced this opening in monolithic corbels. Finally, it was observed that the
treatment of the interface had little significance in the ultimate strength of the concrete corbels
cast in two stages, but it influenced the opening of this interface, although only in concrete
corbels with horizontal stirrups.
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Oliveira, Edilene Muniz de - Consolos de concreto moldados em duas etapas: influência do tratamento da interface e da adição de fibras de aço - 2012 - 156 f. - Dissertação - Programa de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC) - Universidade Federal de Goiás - Goiânia - Goiás - Brasil.