Comportamento do perfil C em aço inoxidável à flexão

Abstract

The use of steel in civil engineering as a structural element has increased in recent years, thus increasing the number of academic researches related to the analysis of the behaviour of steel as a structural element under the effects of axial, bending and torsion efforts. Particularly, the use of stainless steel can be highlighted, being necessary to deepen the investigation to improve its design rules already present in some current standards. The use of stainless steel presents better results in terms of corrosion, durability, mechanical resistance and high temperatures, in addition to its lower maintenance cost, when compared to carbon steel. However, its current design is limiting, with Eurocode 3, Part 1-4 being used as the main standard, which was developed through correlations with the design parameters of carbon steel, not representing all the possible increase in strength due to his hardening. Some more recent proposals are being developed and applied, such as, for example, the Continuous Strength Method (CSM), which seeks to obtain a better result considering the hardening of steel in its calculation. To better understand the behaviour of this material and verify the efficiencies of these design, this work analyzes through finite element models developed in the ANSYS software, the behaviour of channels cross-section subject to minor axis bending, considering the two situations, with your web under tension and compression, to study the differences between the two situations. These results were compared to the results of the previous theoretical design by Eurocode and CSM, being possible to observe the conservatism of the resistance of stainless steel for the two analyzed positions, with more distant results for Eurocode. These analyzes and results were used for the development of some proposals for changes to both designs to optimize them. The choice of this profile is due to the lack of double symmetry of its cross-section, which is less usual than I profiles, which are more used for flexural elements.