Análise estrutural de vigas mistas de aço e concreto de alto desempenho com o software ANSYS.

Abstract

With the objective of build more complex and economical structures, the construction sector has encouraged the development of new structural systems that are more efficient than reinforced concrete for large constructions. One of the construction systems developed to optimize structures is the mixed steel-concrete system, which seeks to combine the qualities of the steel structure with the additional compressive strength of the concrete present in the slabs. To analyze such systems with high accuracy, a very economical and quick way to perform this structural analysis is through the numerical computer simulation among others. For such, the present study focused on analyzing a steel-concrete composite beam with the support of Ansys Student software, in order to evaluate the influence of the high performance concrete collaborating slab in a partially embedded composite beam, comparing it with the results of the isolated steel profile. Thus, the structure was modeled with the profile-Beam W 410 X 75 and a 15 cm thick concrete slab, to obtain the principal stresses on the structure. With the simulation of the structure, it was possible to observe that the concrete cover is able to reduce the internal stresses in the beam from 15% to 35% and reduce the vertical displacement (deflection) up to 55%. Also, it was possible to verify that the change in concrete strength in 10 MPa generated variations of up to 1% in stresses and deformations, becoming more expressive as the change in concrete class is bigger. Thus, it is possible to verify that the structural model of steelconcrete composite beams provides a better distribution of the principal stresses, when compared to the steel structure, reducing the stress on the profile-Beam used, avoiding the use of more expensive W-Beams, and with minors deformations on the structure.