Abstract: The piled raft foundation of the structural core cylinder of a very high raised building is numerically analyzed from three different model approaches by using a commercial software YJK. These three models are: computational model that not considering the stiffness of the superstructure; computational model that considering the stiffness of the superstructure and the computational mode with variable adjusted stiffness. The results indicate that, the model that considers the stiffness of the superstructure and the compatibility of the foundation can effectively the steel reinforcement in the piled raft foundations. With the enough pile axial capacity, the deformation of the piled raft foundation can be controlled through the adjustment of the superstructure stiffness.

Key words: Piled Raft Foundations, Stiffness of Superstructures, Stiffness Adjustment