Estudo dos mecanismos de transferência de tensões de cisalhamento em concreto fissurado com e sem reforço de fibras de aço: uma análise exploratória
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2016-07-28
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Universidade Federal de Goiás
Resumo
The steel fiber-reinforced concrete have been widely used in concrete pieces to improve their
mechanical properties. This research is performed an exploratory experimental analysis in order to
assess the contribution of steel fibers in the shear strength of the concrete. A methodology for
evaluation of the direct shear strength and the direct tension of the concrete is developed, as well as
to evaluate the shear stress transfer mechanism by aggregate interlock. From the tests, it evaluates
the influence of steel fibers in the transfer mechanism of shear stresses through the aggregate
interlock pre-cracked plans of concrete. In the experimental development was used medium
strength concrete (60 MPa), with 12.5 mm coarse aggregate varying the volume of steel fibers in
0%, 0.5% and 1.5%. The results showed that the methodology developed to evaluate the resistance
to direct tensile work, but there needs some modification in the molding of concrete specimens
with fibers to prevent the concentration of fibers in the specimen faces, which resulted in reducing
the tensile strength of concrete. As for the direct shear test with two planes, the results showed that
the test methodology worked well until the maximum force, showing a reduction in the shear
strength of the concrete when compared to similar tests, but with fixed supports. Finally, the results
of direct shear testing on pre-cracked (push-off test) showed that the fibers contribute significantly
to the effect of aggregate interlock by reducing the opening of the crack and the sliding interface
for a given shear stress.
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MARTINS, B. G. Estudo dos mecanismos de transferência de tensões de cisalhamento em concreto fissurado com e sem reforço de fibras de aço: uma análise exploratória. 2016. 152 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2016.