The damage behaviour of structures depends not only on the superstructure but also on the underlying soil. However, in traditional design, the soil-structure interaction (SSI) effect is often neglected, which can affect the seismic response patterns and the analysis of damping performance. In this study, a finite element model of split-foundation (SF) structures is established, and the SSI effect is simulated using the lumped parameter model (LPM). Simultaneously, we introduce the popular mid-story isolation (MSI) technology in recent years. The seismic response patterns of non-isolated (NI) structures and MSI structures under the influence of SSI effects, as well as the damping performance of MSI, are explored. Additionally, we alter the span form of the structure and analyze the sensitivity of the structure to SSI effects and damping performance, making the research more comprehensive. The results indicate that NI structures are more affected by SSI effects, and the significance of SSI effects increases as the soil becomes softer. MSI is insensitive to the SSI effect experienced by the structure. MSI exhibits good damping performance in SF structures.

来源平台：JOURNAL OF EARTHQUAKE ENGINEERING