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<p>Rocking foundations, as an innovative seismic design approach, utilize controlled rotational freedom to provide higher energy dissipation capacity compared to conventional foundations. However, challenges such as permanent settlement and residual rotation necessitate effective improvement strategies. In this study, the dynamic performance of yielding pile groups, particularly with inclined configurations, is investigated through 1g small-scale physical modeling tests as a mechanism to enhance the behavior of rocking shallow foundations. The physical model consists of a single-degree-of-freedom (SDOF) system with a rigid shallow foundation placed on dense sandy soil (Dr = 72%), subjected to controlled lateral displacement simulating seismic loading. The test results indicate that implementing yielding piles, especially those inclined at 20 degrees to the vertical axis, significantly reduces the ultimate foundation settlement (by more than 60%) and increases rotational damping (up to twice the reference case). The energy dissipation is mainly attributed to frictional yielding along the pile shaft and yielding at the pile tip. Additionally, enhanced initial rotational stiffness in improved cases contributed to increased system stability against overturning. These findings demonstrate the high effectiveness of combining inclined yielding piles with soil improvement techniques to enhance the seismic performance of rocking foundations and offer a practical solution for the design of resilient foundations in earthquake-prone areas.</p>

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Seismic Performance Enhancement of Rocking Foundations Using Vertical and Inclined Yielding Pile Groups: Insights from 1g Physical Modeling

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Reza Ala,
  • Meysam Fadaee,
  • Hossein Jahankhah

摘要

Rocking foundations, as an innovative seismic design approach, utilize controlled rotational freedom to provide higher energy dissipation capacity compared to conventional foundations. However, challenges such as permanent settlement and residual rotation necessitate effective improvement strategies. In this study, the dynamic performance of yielding pile groups, particularly with inclined configurations, is investigated through 1g small-scale physical modeling tests as a mechanism to enhance the behavior of rocking shallow foundations. The physical model consists of a single-degree-of-freedom (SDOF) system with a rigid shallow foundation placed on dense sandy soil (Dr = 72%), subjected to controlled lateral displacement simulating seismic loading. The test results indicate that implementing yielding piles, especially those inclined at 20 degrees to the vertical axis, significantly reduces the ultimate foundation settlement (by more than 60%) and increases rotational damping (up to twice the reference case). The energy dissipation is mainly attributed to frictional yielding along the pile shaft and yielding at the pile tip. Additionally, enhanced initial rotational stiffness in improved cases contributed to increased system stability against overturning. These findings demonstrate the high effectiveness of combining inclined yielding piles with soil improvement techniques to enhance the seismic performance of rocking foundations and offer a practical solution for the design of resilient foundations in earthquake-prone areas.