Análise de deslocamentos em lajes nervuradas

Abstract

This work aims to contribute to the determination of displacements in ribbed slabs by comparing experimental results present in the bibliography with simplified methods and numerical methods. The simplified methods used are the model present in NBR 6118 (2014), the CEB bilinear method and the method present in the ACI (2019). Numerical analyzes, linear and non–linear, were performed using the ANSYS computer program, in which the structures were discretized with the three–dimensional element SOLID65. In the non–linear model, constitutive models of the materials present in NBR 6118 (2014) were provided, in addition to the von Mises criterion for steel and the Willam and Warnke criterion for concrete. The models were used in three applications of ribbed slabs, each consisting of experimental tests present in the literature. The first application analyzed was the waffle slab tested by Bastos (2016), the second application was the waffle slab tested by Cunha (2012), while the last application was the 5 unidirectional ribbed slabs tested by Silva Filho (2002). From the results, it was observed that the non–linear model by MEF, adopted by the author, can well represent the behavior of waffle slabs during loading, showing the application potential, as well as the linear model by MEF, although it does not present results as satisfactory as the results of the nonlinear model, it still manages to predict the displacements with greater efficiency than the simplified methods. In addition, the author proposed a simplified method, which consisted of a change in the calculation of the cracking moment of NBR 6118 (2014), which presented the best results among the simplified methods.