Elastic Analysis of the Influence of Masonry on the Soil-Structure Interaction of a Reinforced Concrete Building (Atena Editora)

Abstract

The present work aims to study the influence of masonry on the soil-structure interaction mechanism for a reinforced concrete building. To this end, two finite element models are developed using the SAP2000 program, namely: (i) three-dimensional model without masonry and (ii) three-dimensional model with discretized masonry. This last model, closer to reality, provides greater rigidity to the superstructure. Non-displaceable supports and spring supports are used for the analyses. The results of the model with discretized masonry are similar to those of the model without masonry, that is, when considering the soil-structure interaction, a redistribution of efforts in the structural elements was observed. The peripheral pillars showed an increase in load while the central pillar showed a relief in load. A tendency towards uniformity of differential settlements was observed, especially in the model with discretized masonry and, also, an increase in positive moments in the spans and in negative moments in the peripheral supports of the central beam at the ground floor level. In other words, if the structural design does not consider settlements (case of design without soil-structure interaction), the settlements, by producing a bending moment diagram different from that predicted, can lead to localized plasticization in the beams. Thus, the importance of refined models can be seen and, in cases where settlements are significant, the effect of soil-structure interaction is relevant in the project, not only of the foundations, but also of the structure.