ABERTURAS EM LAJES MACIÇAS DE CONCRETO ARMADO: ANÁLISE DA SUA INFLUÊNCIA NO DIMENSIONAMENTO ESTRUTURAL ATRAVÉS DO MÉTODO DE BIELAS E TIRANTES

Abstract

This manuscript main objective is to compare two methods of designing reinforcement around an opening in a solid slab of reinforced concrete, in addition to analyze the deflections observed in the structural element, in order to compare the impact caused to the service limit state between different types of openings presented. For this, an analysis matrix of 10 identical slabs was elaborated, with different types of openings and positions, so that their reinforcement could be dimensioned with the TQS software help and then, using the same application, to be able to obtain the deflection results.Applying the method, it was found that the further to the center of the slab and the larger was the opening, the greater was the impact generated in the deflections. For the determination of reinforcing reinforcements, the empirical method of Lonhardt and Mönnig was used, and then this result was compared with what was calculated using the strut-and-tie model. With these results, it was observed that the empirical method of Leonhardt and Mönnig presented throughout the analysis matrix, a greater steel area than that obtained by the strut-and-tie model, thus being the most suitable for these situations. This manuscript brings with it a possible future improvement in calculation methods for the situations in which it fits, seeking a methodological simplification.