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Geotechnical engineering has often been challenged, requiring technical and economically innovating buildings designs. The architectural concept of these buildings has resulted in the increase and concentration of the loads coming from the structural system. New models of bearing capacity and settlements control have been evaluated to optimize the designs. In this sense, the piled rafts, they come to admit the contribution of the contact of the soil, conceptually denominated piled raft. In this way, the aim of this article is to analyze numerically the behavior of two piled rafts, simulated from sets of rafts composed of two and four piles, spaced five times the diameter. The foundations systems were simulated by means of piled rafts and the three-dimensional (3D) finite element analyzes with the LCPC-Cesar software. The loading was applied to the top of the foundation system and subsequently the load on the top and tip of the piles, as well as, to evaluate the load transfer mechanism, and the contribution of each element (pile and raft). The constitutive model used was Mohr-Coulomb, which takes into account the elastoplastic behavior of the soil. The results showed the contribution of 36 % due to the raft contact and 64 % due to the pile. The numerical analyzes of pile groups, compared to piled rafts, has shown that the greater contribution of the tip resistance is due to the presence of the contact effect.
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