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<p>Combined Piled Raft Foundations (CPRFs) utilise the complementary resistance offered by both piles and raft to support structural loads. Understanding how these components share lateral demand during earthquakes is essential for ensuring safe and economical foundation design. Although several studies have explored load-sharing under static vertical or lateral actions, the dynamic behaviour of CPRFs during seismic events remains insufficiently documented due to the complexities of soil–foundation–structure interaction. This research investigates the lateral load-sharing (LLS) characteristics of CPRFs in sand through an integrated approach using three-dimensional finite element analyses in ABAQUS (2008) and 1&#xa0;g shake-table experiments. Numerical simulations consider short-, medium- and long-period reinforced concrete superstructures subjected to both real earthquake ground motions and harmonic excitations. Experimental studies use scaled CPRF and single-degree-of-freedom (SDOF) systems tested under sinusoidal inputs. Results indicate that the raft initially resists most of the lateral demand, after which piles progressively take over once the raft’s lateral capacity is mobilised. The transition in load-sharing is strongly influenced by shaking duration and the period of the superstructure. The study also evaluates key design parameters affecting CPRF’s LLS response and offers practical recommendations for designing and optimising CPRF based on load-sharing behaviour.</p>

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Experimental and Numerical Study on Assessing Lateral Load-Sharing Response of Combined Piled Raft Foundation Under Seismic Loading

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Diptesh Chanda,
  • Sakshi Kumar,
  • Rajib Saha

摘要

Combined Piled Raft Foundations (CPRFs) utilise the complementary resistance offered by both piles and raft to support structural loads. Understanding how these components share lateral demand during earthquakes is essential for ensuring safe and economical foundation design. Although several studies have explored load-sharing under static vertical or lateral actions, the dynamic behaviour of CPRFs during seismic events remains insufficiently documented due to the complexities of soil–foundation–structure interaction. This research investigates the lateral load-sharing (LLS) characteristics of CPRFs in sand through an integrated approach using three-dimensional finite element analyses in ABAQUS (2008) and 1 g shake-table experiments. Numerical simulations consider short-, medium- and long-period reinforced concrete superstructures subjected to both real earthquake ground motions and harmonic excitations. Experimental studies use scaled CPRF and single-degree-of-freedom (SDOF) systems tested under sinusoidal inputs. Results indicate that the raft initially resists most of the lateral demand, after which piles progressively take over once the raft’s lateral capacity is mobilised. The transition in load-sharing is strongly influenced by shaking duration and the period of the superstructure. The study also evaluates key design parameters affecting CPRF’s LLS response and offers practical recommendations for designing and optimising CPRF based on load-sharing behaviour.