本文采用集中参数法分析上——结构动力相互作用问题中基础提离、滑移对结构动力特性的影响。假定地基土为弹性半空间体，上介质均匀、线性且各向同性，采用ｗｉｎｋｌｅｒ基础模式；土与结构间的滑移遵从库仑破坏准则。作为实例，在Ｅｌ—Ｃｅｎｔｒｏ地震波作用下，对一结构模型进行了数值分析。研究表明竖向地面运动对结构地震反应有较大影响；基础滑移可减少结构地震反应，起到了隔震作用。 This paper uses the lumped parameter method to analyze the influence of the basic lift-off and slip on the dynamic characteristics of the structure in the structural dynamic interaction problem. Assuming that the foundation soil is an elastic half-space body and the upper medium is uniform, linear and isotropic, the Winkler basic model is adopted; the slip between soil and structure follows the Coulomb failure criterion. As an example, a structural model was numerically analyzed under the El-Centro seismic wave. The research shows that the vertical ground motion has a great influence on the seismic response of the structure; the base slip can reduce the structural earthquake response and play a role in seismic isolation.