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Structural Engineering and Mechanics
  Volume 55, Number 1, July10 2015 , pages 161-189

Effect of raft and pile stiffness on seismic response of soil-piled raft-structure system
Rajib Saha, Sekhar C. Dutta and Sumanta Haldar

    Soil-pile raft-structure interaction is recognized as a significant phenomenon which influences the seismic behaviour of structures. Soil structure interaction (SSI) has been extensively used to analyze the response of superstructure and piled raft through various modelling and analysis techniques. Major drawback of previous study is that overall interaction among entire soil-pile raft-superstructure system considering highlighting the change in design forces of various components in structure has not been explicitly addressed. A recent study addressed this issue in a broad sense, exhibiting the possibility of increase in pile shear due to SSI. However, in this context, relative stiffness of raft and that of pile with respect to soil and length of pile plays an important role in regulating this effect. In this paper, effect of relative stiffness of piled raft and soil along with other parameters is studied using a simplified model incorporating pile-soil raft and superstructure interaction in very soft, soft and moderately stiff soil. It is observed that pile head shear may significantly increase if the relative stiffness of raft and pile increases and furthermore stiffer pile group has a stronger effect. Outcome of this study may provide insight towards the rational seismic design of piles.
Key Words
    seismic base shear; pile-raft-structure interaction; raft flexibility; flexibility of piles; pile shear; column shear
Rajib Saha: Civil Engineering Department, National Institute of Technology Agartala (NIT Agartala), Barjala, Jirania 799046, India
Sekhar C. Dutta: Department of Civil Engineering, Indian School of Mines, Dhanbad, Dhanbad 826004, Jharkhand, India
Sumanta Haldar: School of Infrastructure, Indian Institute of Technology (IIT Bhubaneswar), Samantapuri, Bhubaneswar 751 013, Odisha, India

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