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Master's Dissertation
DOI
10.11606/D.18.2009.tde-14072009-170612
Document
Author
Full name
Jônatas Barreto de Andrade Costa
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2009
Supervisor
Committee
El Debs, Mounir Khalil (President)
Bastos, Paulo Sérgio dos Santos
Pinheiro, Libânio Miranda
Title in Portuguese
Estudo experimental de consolos de concreto com fibras moldados em etapas distintas dos pilares
Keywords in Portuguese
Consolo
Ensaio experimental
Fibras metálicas
Pré-moldado
Abstract in Portuguese
A produção industrial do consolo tradicional apresenta dificuldades devido à grande quantidade de armadura em um espaço pequeno. Além da armadura do tirante principal, normalmente se utilizam estribos verticais e horizontais. O presente estudo experimental propõe um consolo moldado em etapa anterior à do pilar, com a armadura e superfícies preparadas para a ligação posterior com o pilar, durante a concretagem deste elemento. O consolo dispõe somente da armadura do tirante principal e de fibras metálicas incorporadas à matriz de concreto, sem estribos verticais ou horizontais. Em alguns modelos foi utilizado um tipo de armadura de costura alternativo. As principais variáveis analisadas foram a taxa de armadura e o arranjo das barras dos tirantes. A adição de fibras ao consolo reduziu a fissuração na biela de compressão e aumentou a resistência à ruptura dos consolos em 8%, apresentando boa ductilidade, mesmo depois da máxima solicitação. Com o aumento da armadura do tirante no consolo com fibras, a resistência à ruptura foi 69% maior. Considerando o patamar de solicitação de serviço do consolo tradicional, os modelos moldados em etapas distintas apresentaram aberturas de fissuras na interface consolo-pilar 33% maiores, apesar de demorarem mais a aparecer. Entretanto, quando aumentada a taxa de armadura principal, os modelos moldados em etapas distintas demonstraram fissuras 23% menores que o consolo tradicional.
Title in English
Experimental research of reinforced fiber concrete corbels shaped in distinct stage to the column
Keywords in English
Corbel
Experimental test
Precast
Steel fibers
Abstract in English
The industrial production of traditional corbel presents some difficulties due to the great quantity of reinforcement in a small space. Beyond the main bars, it is generally used vertical and horizontal stirrups. This experimental study proposes a corbel shaped in the prior stage to the column, with the reinforcement and surfaces prepared to the later connection with the column during the molding of it. The corbel has only the reinforcement of main bars and steel fibers incorporated to the concrete matrix, without vertical or horizontal stirrups. In some models were used a kind of alternative secondary reinforcement. The main variables analyzed were the reinforcement rate and the arrangement of the main bars. The addition of fibers to the corbel reduced the crack in the compressed diagonal and increased the resistance to rupture of corbels in 8%, presenting a reasonable ductility even after the maximum load. With the increase of reinforcement of main bars in the corbel with fibers, the resistance to rupture was 69% greater. Considering the baseline of service load of traditional corbel, models shaped in distinct stages presented crack openings 33% larger, in spite of taking a longer time to show up. However, when the rate of primary reinforcement was increased, the models shaped in distinct stages had cracks 23% smaller than the traditional corbel.
 
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Publishing Date
2009-07-22
 
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