Análise de efeitos de vibrações em pisos mistos de aço e concreto devido ao caminhar humano : uma comparação entre solução numérica e metodologia do ANSI/AISC 360-16

Abstract

The dynamic effects generated in composed steel and concrete structures, due to human walking actions, are sources of discomfort for building users, therefore, it is necessary to carry out analyzes in order to avoid such effects, which may even make the use of the structure unfeasible. This work aims to contribute to the improvement of these analyzes through the study of computational modeling in structural calculation software that are used in engineering offices. For this, a comparative analysis was carried out between the results obtained from threedimensional modeling in the Robot Structural Analysis software with the ANSI/AISC 360 - 16 methodology. At first, a theoretical model of a composed floor of steel and concrete was elaborated, verified for the ultimate limit state, and submitted to the methodology of ANSI/AISC 360 – 16 for vibration analysis. Then, two models were also performed in Robot software, using two types of approaches that are based on the insertion of the geometry of the composed beam in the software and in the approximation of the mixed condition by displacement in the axes of the elements. At the end of the work, it is concluded that the result of the ANSI/AISC 360 – 16 model is more conservative than the numerical model, considering a reduced floor stiffness and a simplification of the load distribution. In addition, the numerical results differ from each other, depending on whether or not the slab is modeled, which indicates an interference in the rigidity of the model.