ANÁLISE COMPARATIVA DE MÉTODOS ANALÍTICOS CLÁSSICOS E NUMÉRICO VIA MÉTODO DOS ELEMENTOS FINITOS PARA A OBTENÇÃO DE ESFORÇOS EM RESERVATÓRIO PARALELEPIPÉDICO ELEVADO EM CONCRETO ARMADO

Resumo

The objective of this research is to present a comparative analysis of the bending effects and
tension forces of three tanks in reinforced concrete with different storage capacities. To obtain these
efforts two methodologies were considered: (a) one by classical analytical methods and (b) another by
numerical method using the Finite Element Method (FEM). In the analytical methodology, the tanks
were treated as structures composed of isolated slabs where the internal tensions were obtained
through the Plate Theory. In the numerical methodology (FEM), the three tanks were modeled in the
SAP2000® using shell elements. The structures were modeled considering discrete finite elements
meshes with dimensions varying from 20 cm to 40 cm, sufficient to obtain satisfactory bending and
tensile efforts with little computational cost. The results showed that the two methodologies presented
similar results for the slabs of the tank cap while for the tanks bottom slabs, the numerical analysis
presented slightly lower than the values found with the analytical study. The bending moments
between the wall-wall and the wall-bottom were very similar in the two methodologies, while the
positive bending moments presented some divergences.