Numerical analysis in SCAD Office of the Soil-Structure Interaction importance

The purpose of the research is to determine the scope of civil engineering design tasks to decide whether it is necessary to take into account the Soil-Structure Interaction (SSI) effects in seismically active regions. The analysis of SSI effects' significance was carried out by two methods with very close results. It indicates the need to account not only the effect of the soil motion on the structure, but also the reverse effect of the structure oscillations on the soil motion. The presence of the inverse effect introduces changes in the soil motion as compared to the free field motion of the ground surface with the same seismic conditions. This leads to the fact that free field motion accelerograms should be adopted to appropriate stress conditions, the depth of the foundation bottom and modified stiffness of the subgrade.