Identification of SSI Damping System Based on Large-Scale Shaking Table Test

Damping system represents the pattern and characteristics of energy dissipation in a dynamical system. The correct identification of a damping system is not only the premise of selecting dynamical analysis method but also the foundation of obtaining accurate results in seismic analysis. Traditionally, the identification of a damping system under seismic waves is based on material properties. However, this method is the lack of theoretical and experimental research. Based on the most fundamental identification method, the paper presents the study on the consistency of dynamic characteristics between different parts and continuity of motion states at the interfaces of the SSI (Soil-Structure Interaction) system by shaking table test. The changing law of SSI damping system in different dynamic processes is investigated. The experimental results indicate that the SSI system manifests obviously classical energy dissipation characteristics under certain conditions and can be considered as an approximate classical damping system.