Influence of soil-structure interaction on damage spectra of passive energy dissipation structures

The influence of soil-structure interaction (SSI) on damage spectra of passive energy dissipation structures is investigated under seismic loading. A systematic lumped-parameter model is used to model the dynamic behavior of the foundation sitting on soil. The passive energy dissipation devices are assumed to be viscous type. The structure is modeled as a single degree of freedom (SDOF) system which is based on the Takeda model. The results are presented in the form of damage spectra of the key parameters variations. For building systems without energy dissipation devices, it is found that when the shear wave velocity of soil decreases, the damage index of short-period buildings is substantially increased due to SSI. However, the damage index of long-period buildings decreases with the decrease of the shear wave velocity of soil. For the structures with passive energy dissipation devices, especially for the structures with high damping, the damage indexes of short-period and long-period buildings are gradually increased due to SSI. Therefore, SSI has unfavourable influence on the structures with passive energy dissipation devices compared to the structures without the devices.