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本文将空间框架、十字交叉条形基础和土介质作为一个统一的整体，用有限单元法进行相互作用分析．分析时将空间框架离散为空间梁元，用杆系结构有限元分析；将十字交叉条形基础离散为梁板组合结构，板采用平板壳元，梁采用空间偏心梁元，用组合结构有限元进行分析；土介质模拟为分层地基．本文基于相互作用的原理，编制了相应的计算程序，针对一典型算例讨论了考虑地基的不均匀沉降后，引起的上部结构内力的调整；考虑上部结构刚度后，引起的基础内力和地基沉降的调整；以及基础梁的偏心对基础内力的影响，得到了一些对工程实践有实用意义的结论．
In this paper, the space frame, the cross bar foundation and the soil media are taken as a unified whole. The finite element method is used for the interaction analysis. During the analysis, the space frame is discretized into a space beam element, and the finite element analysis of the bar structure is used; the cross bar-shaped foundation is discretized into a beam-plate composite structure; the plate is a flat shell element, the beam is a spatial eccentric beam element, and the combined structure is a finite element. Analyze; soil media simulation for layered foundation. In this paper, based on the principle of interaction, a corresponding calculation program is compiled. According to a typical example, the adjustment of the internal force of the superstructure caused by the uneven settlement of the foundation is discussed. After the stiffness of the superstructure is taken into account, the internal forces caused by the foundation and the settlement of the foundation are discussed. The adjustments; as well as the influence of the eccentricity of the foundation beam on the internal force of the foundation, have obtained some practical conclusions on the engineering practice.