کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
304281 | 512794 | 2013 | 12 صفحه PDF | دانلود رایگان |

The kinematic bending of single piles in two-layer soil is explored to account for soil stiffness degradation and associated damping increase with increasing levels of shear strain, a fundamental aspect of soil behaviour which is not incorporated in current simplified seismic design methodologies for pile foundations.A parametric study of a vertical cylindrical pile embedded in a two-layer soil profile to vertically-propagating S waves, carried out in the time domain by a pertinent beam-on-dynamic-Winkler-foundation (BDWF) model, is reported. Strain effects are treated by means of the equivalent-linear procedure which provides soil stiffness and damping ratio as function of shear strain level. Whereas the approach still represents a crude representation of the actual soil behaviour to dynamic loading, it is more realistic than elementary solutions based on linear visco-elasticity adopted in earlier studies.The paper highlights that soil nonlinearity may have either a detrimental or a beneficial effect on kinematic pile bending depending on the circumstances. The predictive equations for kinematic pile bending in visco-elastic soil recently developed by the Authors are extended to encompass strain effects. Numerical examples and comparisons against experimental data from case histories and shaking table tests are presented.
► Kinematic pile bending is explored accounting for soil strain dependence.
► Strain effects are treated by means of the equivalent-linear procedure.
► Numerical examples and comparisons against experimental data are presented.
► Soil nonlinearity may be detrimental or beneficial for kinematic pile bending.
► Previous predictive equations are extended to encompass soil strain effects.
Journal: Soil Dynamics and Earthquake Engineering - Volume 49, June 2013, Pages 231–242