Segurança estrutural na interação solo-estrutura em edifícios de concreto armado sobre estacas

Abstract

The present work aiming at evaluating the variations of efforts caused in the structural elements and founding elements of a building in reinforced shotcrete, considering four cases of soil-structure interaction (one for each combination of the ultimate limit state elaborated) and the cases presented by Ruas (2015), these being a building projected on indescribable structure and another considering the interaction soil-structure for the envelope of the support reactions for the combinations of the last limit state. The analysis of the structure was performed by the finite element method through the software SAP2000v18 and the soil-structure interaction was considered through the insertion of translational springs in the foundation elements. The model building and foundation elements were dimensioned considering the same factors considered by Ruas (2015) in their study. The shear forces, bending moments and normal stresses were compared in some elements of the first floor of the model building, considering four possibilities of load combinations, with the wind acting as lateral action, overload of use and weight of the elements. Similarly to that observed by Ruas (2015), the consideration of the soil-structure interaction significantly changes the internal stresses in the evaluated elements when compared with the models with and without interaction. The difference between the interaction model proposed in this work and the indeslocável model by Ruas reached the beams to be 58.71% in the shear forces and 41.62% in the bending moments. For the buttress, a difference was 97.72% in the bending moments and 14.90% in the normal efforts. Comparing the models with soil-structure interaction. The variations found in the beams were 31.62% in the shear forces and 33.58% in the bending moments, and in the buttresses 97.67% for the bending moments and 13.79% in the normal forces. Thus, it is clear that consideration of soil-structure interaction is necessary, but its form of consideration also needs to be better evaluated.