Análise experimental e teórica entre o Método à Flexão e o Método de Bielas e Tirantes para cálculo de vigas de concreto armado

Abstract

This work aims to compare the strut-and-tie models with the tradicional method of calculation for structural dimensioning of reinforced concrete beams, through an experimental analysis of the flexural strength of three identical beams. The beams will be scaled by the tradicional method and the results of this analysis will serve as comparative base for the strut-and-tie models, presenting a theoretical example of that methodology to the dimensioning of special structures of reinforced concrete, that in this case will be a direct charge application situation in the middle of the span of each beam. In addition, in this comparison the strut-and-tie models is applied in the two-dimensional software Ftool, since it is a truss. Then the results are analyzed in order to evaluate whether if the dimensioning that was obtained by each of the methods presents different results. How do you know, the flexural models and the strut-and-tie models have very similar theoretical results. These are models used by many standards and both work very well, especially for slender beams, which do not have a very large static and geometric complexity. For the beams made in this work, the practical results of the rupture load, by the flexion models, obtained values between 5,75 and 6,00 tons-force. For the strut-and-tie models, for the same beams, the theoretical breaking load was 5,88 tons-force. Therefore, confirming that both models are equivalent for slender beams, but that a comparison between the models is necessary to define their theoretical differences.