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The global stability of tall reinforced concrete buildings made up of flat slabs is guaranteed, among other factors, by the existence of considerably rigid elements such as elevator cores and stairways. Such rigid cores recurrently have the "L" or "U" format because they fit the architectural design better. However, it should be emphasized the considerable relevance and influence of the slabs transversal bending stiffness in the building stability. The slabs act in conjunction with the columns in the building stability, in the so-called rigid diaphragm effect. That is, they combine the horizontal displacements in each floor and promote a partial restriction to the warping of the rigid cores and the rotation of the ends of the columns, thus reducing the horizontal displacements and the effects of 2nd order. In contrast the slabs transversal bending stiffenes, it should be emphasized the importance of considering the soil-structure interaction (ISE) in the buildings stability. In buildings formed by flat slabs ISE gains considerable relevance because of their characteristics, ie such buildings are particularly sensitive to the influences of soil-structure interaction. In this work, emphasis is placed on the influence of cross-bending rigidity on slabs and on Soil-Structure Interaction in the analysis and verification of the global stability of multi-storey buildings formed by flat slabs and rigid cores.

Analysis of the global tall buildings stability in flat slabs considering the soil structure interaction