Model Experiment and Numerical Modelling of Dynamic Soil-Structure Interaction

Model tests are frequently used to develop new mechanical interface models for dynamic soil-structure interaction during an earthquake. The dynamic soil-structure interaction is often modelled by introducing soil-springs, applying external forces, introducing traction, or forcing displacements at the boundaries. However, in these models, the soil condition is not modelled although the soil-structure interaction is expected to influence the soil condition around the structure. Therefore, in order to understand the soil-structure interaction mechanism, the pressure-displacement behaviour needs to be investigated associated with soil properties. In this study, model shaking tests were performed in the laboratory to investigate dynamic pressure-displacement behaviour of different types of soil ground. In the tests, a structure model supported by bearing system was subjected to lateral force only coming from the soil grounds, which is similar to an actual condition of underground structures during earthquake. Based on measured lateral pressure-displacement behaviour of the structure model, the feature of dynamic soil-structure interaction is discussed associated with soil properties.