Abstract
The kinematic forces induced on piles in two-layered soil medium are investigated using finite element method. Typical layered subsurface condition with the soil properties relevant to Sri Lanka are considered in the present study. Hyperbolic nonlinear constitutive model is used for the soil medium and the soil medium is modelled as a fully coupled system. The effect of the earthquake was simulated by lateral ground acceleration applied to the bedrock. The validity of the results of the proposed model was established by comparing with the trends observed in similar studies reported in the literature. The effects of the stiffness of the soil layers, pile diameter, fixity at the pile head, and a defect present at the layer interface on the kinematic forces are investigated in the present study. Finally, the use of the results of the present study in the design and construction of bored and cast insitu concrete in Sri Lanka are highlighted.
Highlights
Failure of pile foundations due to earthquake induced forces are well documented in the literature
The kinematic forces induced on piles in two-layered soil medium are investigated using finite element method
The effects of the stiffness of the soil layers, pile diameter, fixity at the pile head, and a defect present at the layer interface on the kinematic forces are investigated in the present study
Summary
Failure of pile foundations due to earthquake induced forces are well documented in the literature Majority of such failures are due to the action of lateral forces applied on the piles due to earthquake induced ground motion. As a result considerable amount of research work had been carried out at the research institutes throughout the world, especially in the earthquake prone regions of the world, to investigate the development of earthquake induced forces in piles. It is shown, through such research, that the piles are subjected to inertial effects and kinematic effects during an earthquake
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