Análise comparativa entre vigas mistas e vigas de concreto armado de seção T com ênfase na influência do vão

Abstract

The work consists on the design and comparison between steel-concrete composite beams and T-section reinforced concrete beams considering the variation of the spans. Initially, a literature review was performed to list the main procedures required according to the standards, in order to create a calculation routine for both types of beams. From this, a basic case study was developed aiming at the analysis of simply supported beams submitted to the same linear loading in order to observe the variation of some parameters of the beams such as height, neutral line position, steel consumption, concrete consumption and its own weight for a situation where the adoption of both building systems is possible. The design sought to meet the criteria of satisfaction of the ultimate limit states and the service limit states of excessive deformation using the smallest possible sections so that each part meets the proposed requests. In the composite beam design results, it was possible to observe two models to optimize the metal profile used, one that benefits from the reduction of the beam height and another that favors the reduction of weight and steel consumption. In addition, the composite beams presented resistive capacities beyond what was required to combat the requesting efforts, such feature was addressed in further analysis. Finally, from the comparative, the mixed beams consumed at least twice as much steel as the reinforced concrete beams and that the increase of the spans can even triple the steel consumption, while advantages presented in the considerable reduction on the height and the weight of the beam itself.