Application of Soil Structure Interaction on Building with Basement using Nonlinear Soil Springs

In a typical building design, the interaction between building and surrounding soils is
often ignored. Since soil is deformable and has limited capacity to resist loads, this interaction,
called soil-structure interaction (SSI), could alter building responses, especially during earthquake
loadings for buildings with significant basement depths. In this study, a 10-story reinforced
concrete building with 3-level basement was used to evaluate the effects of SSI on building during
earthquakes. Dynamic time response analyses were performed using earthquake time histories
scaled to a design response spectrum for a Surabaya, Indonesia, location. Soil responses during
earthquakes were modeled using nonlinear hysteresis normal and elastic-perfectly plastic
frictional soil springs, developed using the hardening soil with small strain stiffness model. Depthvarying ground motions were also applied along the basement depth. The results show
inconclusive SSI effects, where some of the time histories produce greater base shears and interstory drifts when SSI is considered, while others show the opposite results.