Análise dos impactos da consideração de interação solo-estrutura na modelagem estrutural de edifícios sob ação sísmica

Abstract

This end-of-study project aims to analyze the consideration of the Soil Structure Interaction (SSI) for seismic calculation. Intending to simplify the structural calculation, the civil engineering works are often designed decoupled of the soil sur which it rests. The modeling is made taking into consideration rigid supports without considering soil settlements. This kind of hypothesis makes de structure more rigid than it really is, generating the reduction of its period of vibration. In contrary, to take in account the SSI, we suggest creating the model supported by dumped springs, what probably will increase the period vibration of the model’s fundamental modes and conduct to less penalizing seismic loading. Aiming well discuss this subject, this report presents a bibliographic research which shows the concepts and the phenomena related to the SSI, to the seismic and to the foundation calculation. Then, we will perform an application over a model with simplified geometry using the software Robot to well verify the interest and the effects of considering the soil structure interaction. We’ll analyze the SSI for a range of geotechnical contexts, buildings heights, building stiffness and structure materials. We will finish the analysis by applying the SSI one of the buildings in the Reunion Airport Roland Garros extension objecting to verify the optimizations that can be made on the foundations. Through the analyzes, it’s possible to confirm that the structure’s period of vibration is increased by considering the SSI. We noted also that, for the compressible soils, no matter the height, or the stiffness, or the kind of used material there’s always the interest of applying SSE. However, for rigid soils like those of type A and B, taking in account the SSE does not present a significant effect.