Dynamic Load Sharing of Combined Pile Raft Foundation (CPRF) for Reinforced Concrete Structures

Soubhagya Karmakar, Rajiv Ranjan and Vedula Srinivasa Phanikanth
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Soubhagya Karmakar: Homi Bhabha National Institute, Department of Atomic Energy, Mumbai, India
Rajiv Ranjan: Nuclear Power Corporation of India Limited, Department of Atomic Energy, Mumbai, India
Vedula Srinivasa Phanikanth: Bhabha Atomic Research Centre, Department of Atomic Energy, Mumbai India

International Journal of Geotechnical Earthquake Engineering (IJGEE), 2020, vol. 11, issue 1, 17-44

Abstract: Combined pile raft foundation (CPRF) is one of the emerging concepts for providing a cost-effective and efficient solutions for heavily-loaded structures. However, predicting the behaviour of such foundations, especially the load sharing between raft and pile is a challenge due to its inherent complex interactions. Existing analysis methods are either bound within a range of simplifying assumptions or sometimes computationally demanding. Hence, an attempt has been made to evolve a simple and easily implementable methodology, considering non-linear degrading behaviour of soil in a rational manner. The approach has first been validated with measured response during an experimental centrifuge testing of a CPRF in soft Malaysian kaolin clay and an instrumented bridge (Impulsora) founded in soft clayey soil. Subsequently, a range of comparative parametric evaluation of load sharing and settlement characterstics has been carried out which has indicated the importance of pile layout, length and numbers to arrive at a safe and economic design.

Date: 2020
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