Título:	Vigas “T” em concreto armado reforçadas ao cisalhamento com compósito de fibra de carbono
Autor(es):	Silva Filho, José Neres da
Orientador(es):	Melo, Guilherme Sales Soares de Azevedo
Coorientador(es):	Nagato, Yosiaki
Assunto:	Estruturas de concreto Cisalhamento Compósitos - fibra de carbono Vigas T
Data de publicação:	7-Abr-2020
Data de defesa:	9-Mar-2001
Referência:	SILVA FILHO, José Neres da. Vigas “T” em concreto armado reforçadas ao cisalhamento com compósito de fibra de carbono. 2001. xxvii, 264 f., il. Dissertação (Mestrado em Estruturas e Construção Civil)—Universidade de Brasília, Brasília, 2001.
Abstract:	The shear resistance of eight “T” reinforced concrete, simply supported beams, submitted to two top point loads using concrete strength of 30 MPa were investigated. Seven of the beams were strengthened in shear with CFRP unidirectional layers, and the main variables investigated were the way the CFRP sheets were anchored, the direction of the CFRP layer, vertical (five beams) or inclined at 45° (two beams), and the number and width of the layers. The remaining beam was used as reference, without being strengthened. The strengthened beams were loaded previously until Service load. The beams were divided in two groups, the first with the CFRP sheets wrapping the web and the flange of the beams (Group 1), and the second with the CFRP sheets enveloping only the web of the beams, and anchoring at the bottom of the flange (slab) - Group 2. The beams were 4400 mm (overall length) x 400 mm (overall height) x 150 mm (web width), with 4000 mm clear span, 550 mm flange width and 100 mm flange thickness. Results of ultimate loads, failure types, cracking, deflections, concrete and reinforcement strains are presented. Comparisons with estimates by design methods, and by estimates by others authors are also presented. The two Solutions investigated in this research worked: wrapping of the web and flange with CFRP laminates strips through drilled holes, and anchoring the CFRP laminates strips ends together with two 8.0 mm bars in slots drilled at the web close to the flange. They improved the behaviour, allowing the beams reaching higher ultimate loads respectively (in average) 60% and 40% higher than the reference beam. However, wrapping the web and flange through drilled holes is quite laborious and messy. Anchoring the CFRP laminates strips ends together with two 8.0 mm bars in slots drilled at the web close to the flange is less laborious and messy, but this system should be improved, as avoiding the stirrups, for example, could be a problem. On the other hand, unless special caution is taken a less effícient anchorage at the web / slab (flange) comer region should be expected anyway, as the roughening and cleaning of the substrate, and gluing of the laminates is much more difficult.
Unidade Acadêmica:	Faculdade de Tecnologia (FT) Departamento de Engenharia Civil e Ambiental (FT ENC)
Informações adicionais:	Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2001.
Programa de pós-graduação:	Programa de Pós-Graduação em Estruturas e Construção Civil
Aparece nas coleções:	Teses, dissertações e produtos pós-doutorado

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