上部结构一筏板一地基共同作用分析作为一种结构设计方法，其理论研究与工程实践尚处在初级阶段。本文重点研究在竖向载作用下，考虑空间框架一筏板一地基共同作用时结构的受力和变形性能，并利用有限元方法对框架－筏板－地基三维模型的受力性能进行数值分析，本文主要完成了以下工作: (1)本文通过ANSYS程序，建立了空间框架一筏板一地基的有限元分析模型，它能对在竖直荷载作用下的结构进行共同作用的受力和变形分析。 (2)采用层状横向各向同性弹性半空间地基模型，根据克希霍夫的薄板小挠度理论，通过ANSYS有限元分析程序，分析弹性地基上的筏板基础。 (3)本文分析了不同荷载、筏板厚度、混凝土强度等情况下，弹性地基上基础的地基内力和基础内力。通过对上部结构、筏板及地基的不同参数的共同作用的分析研究和一些算例得出这些结论，对实际的设计有一定的参考价值。

The interaction analysis of the space frame-raft-soil foundation is one method of all design, whose theoretic research and practical application just start on .The article is emphasized on researching the characters of the structural internal force and displacement considering the interaction of space frame-raft-soil foundation under vertical loads. Some conclusions of interaction are derived from the research. The main researches are outlined as following: (1)In this article, through the analysis of ANSYS procedure, the finite element model of space frame-raft-soil foundation is created. The model can analyze the characters of the structural internal force and displacement considering the interaction of space frame-raft-soil foundation under vertical loads. (2)Adopting layers horizontal isotropic elasticity half-space ground model, according to the Kirchhoff theory of Small deflection of thin slab,through the analysis of ANSYS procedure,analyze the raft board foundation on the elastic ground . (3)In this article, the 3D static model is used to calculate the internal force in ground and foundation for different loads, thickness-raft , raft board concrete intensity on elastic ground. The conclusions getting through different data of space frame-raft-soil foundation and some cases are expected to be of referential use to practical engineering design.