ESTUDO DA ESTABILIDADE GLOBAL DE ESTRUTURAS DE CONCRETO ARMADO

Abstract

Advances in construction technologies and theoretical studies have made it possible to rise of taller buildings. These buildings tend to suffer from the effects of wind, which can cause unwanted instabilities in the structure. Theoretical models have provided, in addition to structural safety, material savings, as they seek to use the material at its maximum capacity. In this sense, this work aims to study the instability of a five-story building from the parameter α and the coefficient γz. For this study, two global analyzes were performed, one 2D and one 3D. Furthermore, for each analysis (2D and 3D) three situations were studied: Situation I (section 14x30 cm, fck = 30 MPa); Situation II (section 14x40 cm, fck = 25 MPa); Situation III (section 20x30, fck = 20 MPa). The results found for α and γz were analyzed in order to discover the best composition that provides greater rigidity to the structure. The two calculation methods proved to be decisive and coherent in unanimously indicating Situation II as the one with the best rigidity and Situation I like the worst. In this way, it concludes that preference should be given to the section, with a focus on increasing of inertia, in relation to resistance, and thus improves the rigidity of the structure, which can lead to security with better economy.