Piled-raft foundations have become a reliable alternative to traditional group pile systems for high-rise structures, offering enhanced control over total and differential settlements, which contributes to improved structural stability and longevity. However, seismic design practices often oversimplify these systems by neglecting the contribution of piles, treating the foundation as a raft alone. This study explores the seismic behavior of Combined Piled-Raft Foundations (CPRF) under pseudo-static loading, focusing on the CPRF coefficient as a measure of load-sharing efficiency. A detailed parametric analysis was conducted to assess the influence of yield criteria, pile length, raft thickness, internal friction angle, and soil modulus on system response. The results reveal that piles carry the majority of the applied load, while pile length has minimal effect on both the CPRF coefficient and lateral displacement. Although raft thickness does not significantly alter the CPRF coefficient, increasing it helps reduce lateral displacement. Furthermore, higher internal friction angles and soil moduli lead to reduced lateral displacement. Notably, the CPRF coefficient for piles negatively correlates with these soil properties, whereas the coefficient for the raft shows a positive correlation. These insights are critical for refining seismic design strategies and optimizing the performance of piled-raft foundation systems in earthquake-prone regions.
Gupta et al. (Mon,) studied this question.
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