Análise da interação solo-estrutura de um edifício com fundações em sapatas.

Abstract

Analysis of soil-structure interaction of a building with footing foundations. On the conventional practice of building projects, it is common to adopt the hypothesis of fixed supports, disregarding the action of the soil-structure interaction throughout the building period, which is responsible for the variation of efforts in structural elements and the uniformization of foundations settlements. In this context, the aim of this work was to evaluate the effects of the soil-structure interaction in settlements redistribution for a building on spread footing foundations. Therefore, it was made a comparative study between the measured settlements, which was obtained from the monitoring carried out by Lucena (2003), and the settlements predicted by numerical models of the soil-foundation system on ELPLA software. Firstly, it was considered two models: one with the footings aging alone on soil and another who considers the conjunct action from all footings of the building (in this text, denominated as foundation system). After the first analysis, it was made a modification on the foundation system model, in what the layers under the pressure bulbs were disregarded. The evaluation of the measurement results was conclusive about the influence of the soil-structure interaction on the homogenization of the settlements, angular distortions and the settlement velocity, during the construction of the first floors. In relation to the settlement predictions, it was verified that both, the isolated footing model and the modified foundation system model has presented satisfactory results, proving the effectiveness of this kind of prediction. On the other hand, the first foundation system model presented overpredicted settlements since stress values who varied between 60 kPa and 100 kPa, which was proven to be associated with the calculation criteriums of the software. In general manner, it was found that the differences between the predicted and measured settlements are influenced by the disregard of the soil-structure interaction and other parameters as the variation of the soil over the terrain and the loads distribution on foundations.