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<p>In most practical foundation design, stresses in the central region of the foundation are typically higher than those in the outer areas. Consequently, these elevated stresses can lead to differential settlement, potentially exceeding allowable limits and inducing secondary stresses in both the foundation and building frames. To mitigate settlement and reduce construction costs, the Composite Piled Raft Foundation (CPRF), which combines long and short piles, has been introduced. The CPRF integrates the advantages of both shallow and deep foundations, effectively controlling excessive settlement in high-rise buildings while ensuring stability under static and seismic loads. This study evaluates the performance of CPRF under both static and seismic loading conditions, with a specific focus on settlement control, load distribution, and dynamic response. The influence of different pile length configurations on settlement behavior and load-sharing mechanisms is analyzed. Additionally, the study investigates the effects of seismic loading on structural response, including lateral displacement, bending moments, and shear forces. The interaction between soil, foundation components, and the superstructure is examined using 3D finite element modeling under various loading scenarios. Four types of CPRFs, featuring different configurations of short and long piles arranged in a 5 × 5 grid, were analyzed. Additionally, three buildings with different storey counts (10, 17, and 25) were modeled to assess how building height and load distribution influence foundation behavior. Seismic loading was simulated by applying time-history acceleration at the base of the soil mass. The results indicate that incorporating short piles reduces the vertical load-bearing capacity of the pile group but has a minimal effect on foundation settlement under static loading. In contrast, under seismic loading, replacing long piles with short piles enhances the pile group’s lateral resistance. Furthermore, bending moments and shear forces at the heads of short piles are greater than those at long piles in the same positions. Ultimately, this study demonstrates that CPRF provides an effective foundation solution for high-rise buildings, offering both economic and structural advantages. The findings highlight the importance of pile length optimization in improving foundation performance, particularly under seismic conditions, making CPRF a viable alternative to traditional deep foundation systems.</p>

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Performance of Composite Piled Raft Foundations with Long and Short Piles Under Static and Seismic Loading

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Ali Akbari,
  • Abolfazl Eslami

摘要

In most practical foundation design, stresses in the central region of the foundation are typically higher than those in the outer areas. Consequently, these elevated stresses can lead to differential settlement, potentially exceeding allowable limits and inducing secondary stresses in both the foundation and building frames. To mitigate settlement and reduce construction costs, the Composite Piled Raft Foundation (CPRF), which combines long and short piles, has been introduced. The CPRF integrates the advantages of both shallow and deep foundations, effectively controlling excessive settlement in high-rise buildings while ensuring stability under static and seismic loads. This study evaluates the performance of CPRF under both static and seismic loading conditions, with a specific focus on settlement control, load distribution, and dynamic response. The influence of different pile length configurations on settlement behavior and load-sharing mechanisms is analyzed. Additionally, the study investigates the effects of seismic loading on structural response, including lateral displacement, bending moments, and shear forces. The interaction between soil, foundation components, and the superstructure is examined using 3D finite element modeling under various loading scenarios. Four types of CPRFs, featuring different configurations of short and long piles arranged in a 5 × 5 grid, were analyzed. Additionally, three buildings with different storey counts (10, 17, and 25) were modeled to assess how building height and load distribution influence foundation behavior. Seismic loading was simulated by applying time-history acceleration at the base of the soil mass. The results indicate that incorporating short piles reduces the vertical load-bearing capacity of the pile group but has a minimal effect on foundation settlement under static loading. In contrast, under seismic loading, replacing long piles with short piles enhances the pile group’s lateral resistance. Furthermore, bending moments and shear forces at the heads of short piles are greater than those at long piles in the same positions. Ultimately, this study demonstrates that CPRF provides an effective foundation solution for high-rise buildings, offering both economic and structural advantages. The findings highlight the importance of pile length optimization in improving foundation performance, particularly under seismic conditions, making CPRF a viable alternative to traditional deep foundation systems.