Abstract
The effect of in-situ variability of undrained shear strength of clay and different soil structure interaction (SSI) modeling approaches on the seismic response of piled-raft supported structure is studied. SSI leads to increased or decreased responses of structure as compared to fixed base design philosophy. The distribution of forces in column and pile head may also depend on inherent variability of soil. This results in an unsafe or conservative design of column and pile due to seismic loading. The soil-piled raft-structure interaction is modeled as beam on non-linear Winkler foundation. Response statistics of the system are estimated using Monte Carlo simulation. Finally, design implications are suggested for seismic design of piled raft supported structure with an emphasis on probabilistic SSI based sustainable design approach.
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