Equações utilizadas para calcular flechas em vigas biapoiadas de concreto armado : um estudo comparativo

Abstract

The main objective of the work is to show the practical results for two equivalent moment of inertia equations for the calculation of deflections in simply supported reinforced concrete beams and to make a comparative study. Branson's equation (1965), which is currently still used in several countries around the world, including the Brazilian standard, NBR 6118:2018, was one of the equations used. And the second equation is from a more recent study, proposed by Bischoff (2005). For the study to be carried out, the 12 Bresler-Scordelis beams were used, keeping their experimental curves as a basis for comparison. The experimental data of the deflections of these beams were obtained with the aid of the Digitizer program, and the data obtained in the calculations, using the two equations, were generated and presented in the form of tables and graphs. That is, by means of the calculation results, with the aforementioned equations, the two analytical curves were generated in a single Load versus Deflection graph, which could be compared with each other and with the base experimental curves. These results showed different values, but quite close.