Soil structure interaction effects for strip foundation and layered soil
conference paper
Formula in seismic design codes and guidelines that cover inertial soil-structure interaction (SSI) effects are mainly developed for rigid circular or rectangular plate footings and homogeneous soil conditions. Analytical formula define period elongation and SSI damping based on foundation dimensions and soil stiffness. Corrections have been proposed for layered soils by a few researchers, based on the principle of depth averaging of stiffness. Residential buildings in the gas production induced seismicity region in Groningen (The Netherlands) typically have strip footing foundations and are built on relatively soft soils. It was questioned if the available analytical SSI formula apply to such buildings. For this reason a numerical FEM analysis study was performed investigating the behavior of such foundations. Period elongation effects were defined based on free vibration responses. SSI effects on spectral demand have been established based on time history analysis calculation of the acceleration and relative displacement demands. The interesting results of the study indicate ranges of conditions for which relative period elongation and increase of damping are significantly different compared to what would be predicted based on the existing code based formula for plate foundations.
Topics
TNO Identifier
946645
Source title
ICEGE Conferentie, Rome, 2019
Pages
1-8
Files
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