Avaliação da eficiência do uso de conectores de cisalhamento no reforço de vigas de concreto armado pela face comprimida
Carregando...
Data
2011-06-30
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
A structure is designed to have satisfactory performance during its life given the requirements for which it was designed. When performance becomes unsatisfactory, intervention is needed in order to rehabilitate the structure. Structural rehabilitation is characterized by increasing the structure‟s original load bearing capacity. Of the various existing intervention techniques, this work studies the technique that increases the concrete section by adding more concrete to the compression side and evaluates the effectiveness of shear connectors to bond the new concrete to the base concrete. The increase of the concrete section and the layout of the shear connectors were done along the entire length of the beam. There were two test series. In the first test series, called preliminary tests, the variable studied was the type of connector in order to determine which type ("I", "U" or "AF") would present more efficient results. In the second test series we adopted the connector type "I", which showed the best results from the first series. The variables studied in the second series were the shear connector ratio, the influence of pre-cracking and the presence of confining reinforcement in the new concrete region. The surface treatment used was manual blasting without the use of bonding agents. The test results indicated that the presence of shear connectors type "I", a small ribbed reinforcement bar, prevented the loss of bond between the base concrete and the new concrete, prevented splitting of the new concrete cover which was observed in tests with beams reinforced without the shear connectors. Good results were obtained with respect to increased load bearing capacity of the beams, since even the pre-cracked beams gained strength as well as strength increased in non-cracked ones.
Descrição
Palavras-chave
Citação
SILVA, Paula Miranda da. Evaluation of the efficiency of the use of shear connectors in the strengthening of reinforced concrete beams by the compressed face. 2011. 137 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2011.