Análise teórica e experimental de aberturas horizontais em vigas de concreto armado.

Abstract

During civil constructions there is a need to perform openings in the web of reinforced concrete beams, in situations where passage of electrical wires or plumbing are indispensable. In order to avoid construction failures, it’s essential to use special reinforcement so that the strength of the beam is not influenced by the existence of the openings. The objective of this work is to elucidate the issue of openings in reinforced concrete beams, and to contribute to the reinforcement bars of these regions being applied in civil construction. Firstly, it was verified what Brazilian Norm (6118:2014) advocates and, it was searched for bibliographies with sizing methods for reinforcement bars, when the dimensions of the opening do not fit the normative requirements. Later, for the accomplishment of the experiment, the method described by Leonhardt and Mönnig (1978) was used for the dimensioning of the reinforcement bars. For this investigation, three beams with rectangular openings in the shear region were tested by the Stuttgart test and compared to a full-web beam. Finally, it was observed that the application of the method chosen in this experiment of rectangular openings in beams, did not present relevant deformation and non-influenceable resistance, as long as it respects the required bars of reinforcement.