Análise comparativa entre pilares metálicos e mistos aço-concreto aplicados em edifícios de múltiplos pavimentos

Abstract

The execution time of a structure and the physical characteristics of the materials are parameters that can define the choice of a constructive system. In this context, metallic structures have been gaining ground in many projects, for they allow a fast execution and light beans with reduced section. However, these structures have limitations on the reduced slenderness of their parts, which result in instability and buckling problems, and require additional protection against fire and corrosion. Considering the limitations of the metallic structures, a new structural arrangement arose, in which the concrete works together with the metallic profiles, with the help of shear connectors, improving the behavior of the isolated steel structure, this new structural configuration was named mixed structures of steel and concrete. Therefore, the main objective of this work was to compare mixed steel and concrete pillars with metal pillars, using a 30-story building as a model, and the analysis of possible reductions in the steel rate in order to indicate the applicability or not of these mixed elements. In order to reach this objective, was made use of the STRAP® computational program for the modeling and analysis of the structures. The results showed that not all commercially available rolled profiles can be used in the design of mixed columns according to current Brazilian standards due to geometric limitations, and it has a direct influence on the results of the study. Finally, it was possible to confirm the reduction of the steel rate in the mixed columns, and it was more significant in columns under higher axial loads of compression.