Resistencia ao cisalhamento de vigas em concreto armado reforçado com fibras de aço

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

In this work presented the results of an experimental study developed in the Structures and Construction Materials Laboratory of Civil Engineering Faculty of UNICAMP, that it looks for to evaluate the influence of the incorporation of low volume fractions of steel fibers in shear strength of high strength reinforced concrete beams submitted at bending moment. I shape beams containing 1.32 and 2.19% of longitudinal steel ratio, 0.364% of shear steel ratio and the shear span/effective depth ratio of 4.27, were moulded with concrete compressive strength of 90 MPa also incorporating high strength fibers (high carbon steel fibers, with yield strength of 2600 MPa) in volume fractions of 30, 40, 50 and 60 kg/m3. For quantify the influence of the incorporation of those rates fibers in the shear strength, testimony beam (without fibers) it went designed to reach shear collapse. The option for high carbon steel fibers was determined by results obtained in previously developed work by Pinto Jr.40, results those that demonstrated the best acting of that fiber type in relation to the one of low carbon, in function of high bond existent among fiber and matrix in these concretes of high strength, that it causes fibers rupture of smaller resistance and, consequent1y, smaller ductility and less efficient cracking control. The results of the experimental program demonstrated that the high carbon steel fibers have significant contribution in the shear strength of high strength concrete beams, altering, besides, your rupture form (from diagonal tension failure to flexure failure). Stands out, still, your beneficial effect in the cracking control, propitiating an increase of rigidity of the pieces, what leads, evident1y, to a larger durability

ASSUNTO(S)

cisalhamento vigas fibras de metal concreto armado

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