Interação solo-estrutura em edifícios sobre fundações superficiais

Abstract

Usually, structural designs are analyzed considering rigid support at their base, this is, without the effect of displacement, however, in reality the building is supported on the massif of deformable soil, suffering displacement, causing a redistribution of forces on the structure. In this context, it is intended to compare the internal forces and the displacements generated in the structure between a fixed support model and flexible support models. As well as to verify the influence of different types of soils and different number of floors in the variations of the results. For this, where modeled two buildings with 5 and 10 floors each, on shallow foundations, with structural analysis made using Eberick V10 software from AltoQi®. To simulate the soil behavior under the structure, were obtained spring coefficients through a with language Visual Basic (VB) spreadsheet using the Microsoft Excel platform developed by the author, in order to accelerate this process. The results showed greater variations in the limbs close to the foundation, justified by the increased rigidity of the structure with the increase in the number of floors. It was found maximum increases in bending moments and displacements in the order of 1883.72% and 133.33%, respectively, were found at the building foundation of 10 floors. On the other hand, there were few changes in the vertical loads on the pillars, with maximum increases of 5.89% on the last floors building. In addition, it was found that the soil with the lowest reaction coefficient and the building with the largest number of floors tends to undergo greater changes in its results. In general, was evident the discrepancy of percentage variations in results, justifying the relevance of considering the effects of soil-structure interaction on a structural design. It is concluded that their contempt can generate results far from reality, sometimes making the analysis of buildings discrete.