Análise dos efeitos da interação solo-estrutura em edifícios estruturados em aço

Abstract

The present work presents a comparative study between different steel structures on shallow foundations (single footing) and deep foundation (piles) with the purpose of identify the effects of the consideration of the soil-structure interaction (SSI) on the structural analysis. The SSI consideration is a refinement of the structural analysis, currently allowed through the evolution of the computer science and where the deformability of the soil in the structural model is taken into account. In the literature are found several studies on the effects of SSI in the structural analysis regarding the structures of reinforced concrete, however for steel structures there is a need to deepen the studies. In this work 5 steel structures and their respective shallow and deep foundations were designed, where the number of floors was varied (4, 8, 12, 16 and 20 floors), and consequently the types of bracing. Initially the structures were analyzed considering the rigid support, then they were analyzed considering the deformability of the soil and the obtained results were compared to each other. For the SSI consideration, the Winkler Hypothesis was used, through the coefficients of reactions (vertical and horizontals). An application was developed in order to streamline the process of obtaining coefficients. Were analyzed the results of support reactions and bending moments at the base of the columns, global stability coefficients B2, lateral displacements and soil displacement. The results show that the axial compression forces, bending moments and soil displacements were not significant, possibly due to the lightness of the steel structures, since the lateral displacements show major changes due to the withdrawal of the rotation restriction of the support and consideration of the real rotation stiffness of the column-footing connection, the coefficients of global stability also suffered significant variations, where there were changes in the classification of the steel structure from small to medium displacement, which would imply different considerations in the structural analysis. The work carried out intends to initiate the studies of the SSI consideration in the analysis of the steel structures, thus improving the degree of refinement of the structural analysis.