Análise comparativa pelo método dos elementos finitos de modelos tridimensionais clássicos e evolutivos do sistema estrutural de um edifício alto em concreto armado

Abstract

The structural analysis of tall buildings requires the use of more realistic structural models. In the present work, four different tridimensional structural models were used to analyze a thirty-floor tall building composed of slabs, beams and columns. Two conventional models in which all the load is applied simultaneously after the completion of the structure were employed - one model takes into account the axial deformation of columns and the other does not. Two different sequential analysis models were used in this analysis as well one model is more realistic than the other. In these models, the load is applied gradually to the structure considering both the construction and the loading stages and both of them take into account the axial deformation of columns. It is used the finite element method that performs the tridimensional analysis of a model composed of elements of slabs, beams and columns. The findings of this analysis clearly show that distinct structural models may lead to very different results. In addition, the more information about the real structure is added to the structural model, the more realistic is the model and the better are the results. Moreover, it is concluded that the sequential analysis model which considers the construction and the loading stages is more reliable than the conventional models. Therefore, sequential analysis models are recommended as standard models in the structural analysis of tall buildings. However, due to the extra workload involved in the structural analysis based on these models, it is necessary that structural analysis programs be developed in order to make feasible the frequent use of sequential analysis models in structural engineering offices.