EGE 12TH INTERNATIONAL CONFERENCE ON APPLIED SCIENCES
OPTIMIZATION OF PILED RAFT FOUNDATIONS WITH SUPERSTRUCTURE INTERACTION
Yayıncı:
Academy Global Publishing House
Piled raft foundation systems are designed primarily to mitigate settlements rather than to enhance bearing capacity. This approach is suitable for soils without bearing capacity or liquefaction issues, where the structural load is shared between the piles and the raft foundation. In geotechnical modeling, structural loads are often represented as uniformly distributed loads to save time and simplify solutions; however, this method inaccurately reflects the settlement behavior of the foundation. With advancements in computational technology, accurate and efficient modeling of superstructure-foundation-pile-soil interactions has become feasible, enabling more economical and realistic designs. In this study, a piled raft foundation system supporting a hypothetical 30-story building was modeled using PLAXIS 3D software. Initially, a uniform distributed load of 400 kPa was applied to the raft foundation, resulting in a total settlement of 143 mm. Subsequently, the superstructure was modeled in three dimensions, reducing the maximum settlement to 109 mm. Different pile spacing configurations were analyzed, yielding maximum settlements ranging from 39 mm to 64 mm. The results demonstrated that incorporating the superstructure into the model provides more accurate settlement predictions and that overly dense pile arrangements are unnecessary. Additionally, the use of piles beneath the raft foundation significantly reduced bending moments by more than 50%. This study concludes that piled raft foundation systems can provide more economical and optimal solutions compared to conventional piled foundations, highlighting the importance of superstructure interaction in achieving efficient and realistic designs.
