Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface
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2012-08-21
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Universidade Federal de Goiás
Resumo
Currently, the civil construction industry has presented some changes. This is due to the
recent economic growth that Brazil had achieved. These changes increased the employment of
precast concrete structures. The front of this, some studies about the precast concrete
connections had been developed. This work objective was to study the shear stress
transference mechanism, which appears in the beam-slab connection interface – the composite
beams. It was tested three different roughness degrees of the slab shear pockets: naturally
rough surface, intentionally rough surface and surface with shear-key. For this, push-out tests
– double “L” – were carried out and they showed that the employment of surface setting
retarder admixture (ARSP) achieves the roughness degree recommended by the
NBR 9062 (ABNT, 2006) without significantly reduce the connection strength. Next, with the
same model type, the influence of the percentage of steel across the joint above the strength
connection was tested. Besides, another model type – three blocks – was carried out with the
same aim. Through those tests, It was could ascertained that the increase of the percentage of
steel across the joint provides a linear increase of the strength connection, in as much as, the
minimum and maximum values were inspected. Furthermore, the double “L” tests allowed the
proposition of two expressions to determine the strength shear connection. And, in a third
moment, composite beams were carried out, the results indicated, for the roughness degree
and percentage of steel across the joint tested, that the beam-slab connection presents a partial
interaction degree, even as the connection degree. Ultimately, the similarity between the three
different types of tests could be proved with the proposed expressions application in the tests
results.
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BORGES, V. E. S. Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface. 2013. 175 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2012.