Análise estrutural em regime linear elástico e linear com redistribuição: estudo comparativo em vigas de concreto armado

Abstract

The structural analysis is one of the most important stages of a structural project, because it is through it that the prediction of how a certain structure will behave when facing all the stresses imposed on it is made.This way, the central objective of this study was to technically and economically compare the results obtained from the design of a set of reinforced concrete beams that constitute a 4 floors commercial building through two situations of structural analysis: linear and linear with redistribution. For this, the software used in the design was Eberick, in which the design parameters, as well as the dimensions of the structural elements and loadings were kept the same, differing only in the analysis method employed. In the elastic linear analysis, all beam nodes were considered as rigid and in the redistributed analysis, all semi-rigid nodes were considered, which was considered a redistribution of 25%, thus a coefficient δ=0.75, since the structure of this study is classified as of fixed nodes. With the results obtained, a comparison of bending moments, displacements, steel quantities, costs, and reinforcement detailing was carried out in order to verify how the redistribution influences the behavior of the structure and if a reduction in costs and an improvement in the execution of the reinforcements is opportunized. The results indicated that for the set of beams of the example building evaluated in this study, the redistribution generated an economy of negative reinforcement, but in contrast, the positive reinforcement had an increase thus generating a higher cost and that?s why no savings were obtained in the total cost, because through this, there was an equivalence, which made the results not economically more attractive, resulting in a reduction of only 0.01% for the linear situation with redistribution. [resumo fornecido pelo autor]