Investigation of the behavior of floating or end piled raft foundations by three dimensional finite element method

The human population is increasing day by day in the world. With the increase in the human population and the urbanization of people, the need for shelter also increases. Due to increase in the need for shelter, the number of floors of the buildings also increases. Building-soil interaction has become an important problem in Turkey due to the increase in the number of floors due to the soil structure. Therefore, deep foundations are preferred for the foundation system. Pile foundations, one of the deep foundation types, are frequently used when the structural loads cannot be carried by the shallow foundation. Pile raft foundations are a foundation system that combines the load-bearing capacities of pile and raft. With the three-dimensional finite element method, numerical models of the reinforced concrete superstructure, piled raft foundation and foundation soil to be used for school purposes were created. In the model, the behavior of the piled raft foundation with respect to the end and floating piles of the reinforced concrete superstructure to be used for the school was investigated. In the first case, the structure was modeled as a floating pile (11 m sand 9 m rock) in the soil at a depth of 20 m, and in the second case it was modeled as an end pile (8 m sand 12 m rock). Analyzes were made with the Plaxis 3D program by determining the column, beam and slab loads and material properties. From the results of the numerical analysis, it was noticed that the load bearing ratios of the piles are high in the dynamic and static situations when the soil type is a strong bedrock.