Análise dos mecanismos resistentes e das similaridades de efeitos da adição de fibras de aço na resistência e na ductilidade à punção de lajes-cogumelo e ao cisalhamento de vigas de concreto. / Analysis of resistant mechanisms and similarities of the addition effect of steel fibers on strength and ductility to both the punching shear of flat slabs and the shear of concrete beams.

AUTOR(ES)

Kristiane Mattar Accetti Holanda

DATA DE PUBLICAÇÃO

2002

RESUMO

One of the main problems of flat slabs concerns the punching shear failure of the slab-column connection. This form of failure must be avoided, providing flat slabs with the best conditions for the development of yielding mechanisms of the flexural reinforcement before the occurrence of shear failure. The addition of steel fibers to concrete elements subjected to tangential stress provides performance improvement, by either the resistant capacity increase or the failure mode alteration. It is intended to contribute to the advance of the subject knowledge, by exploring aspects as the analysis of similarities of the steel fiber addition effects on both strength and ductility of flat slabs to punching shear with those observed in the shear of analogous prismatic beams. The cases approached include internal slab-column connections without shear reinforcement, and the variables investigated included concrete strength, fiber volume and type of steel fiber. From the experimental results, it was possible to verify that there exists a similarity of structural behavior between these two elements and the shear tests in prismatic beams can be used to get indicators to be utilized in punching shear tests of flat slabs. An adaptability analysis of the existing theoretical models on shear in beams and punching shear in flat slabs was carried out in order to consider the steel fibers addition effect on the concrete. Based on these models, quantitative criteria for the evaluation of both strength and ductility of the slab-column connections were established.

ASSUNTO(S)

concreto com fibras de aço modelo teórico punching shear shear steel fibers reinforced concrete cisalhamento punção theoretical model similarities similaridades

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