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本文提出了用有限单元法分析空间框架-筏基(或独立基础)-三维非均质土体系统的相互作用基本原理。分别对空间框絮、筏基(或独立基础)和三维非均质土体的有限单元模型作了简单介绍。势以Larnach在1970年用荷载传递系数法分析相互作用影响的典型框架为例,即对钢筋混凝土空间框架-独立基础-三维均质土体系统进行了有限元分析,从而第一次将有限单元法用于空间框架-独立基础-三维土体系统的相互作用分析。 文中对置于同一土层上的典型框架分别采用刚性基础(即常用的分析方法)、筏基及独立基础三种情况进行了分析比较。由比较结果说明,考虑相互作用对上部结构内力将产生很大的影响。从而说明了进行相互作用分析的重要性。 同时也可看到,选择不同的基础形式,也会对上部结构内力产生较大的影响。
In this paper, the basic principle of the interaction between the space frame-sulfhydryl (or independent basis)-three-dimensional heterogeneous soil system is analyzed by the finite element method. The finite element models of the space frame, ramie (or independent foundation) and three-dimensional heterogeneous soils are briefly introduced. Taking Larnach in 1970 as an example of a typical framework for analyzing the interaction effects using the load transfer coefficient method, the finite element analysis of a reinforced concrete space frame-independent foundation-three-dimensional homogeneous soil system was carried out, and the finite element was first introduced. The method is applied to the spatial framework-independent foundation-interaction analysis of the three-dimensional soil system. In this paper, the typical frameworks placed on the same soil layer are analyzed and compared using the rigid foundation (ie, commonly used analysis methods), sulfhydryl and independent foundation. From the comparison results, it is considered that the interaction has a great influence on the internal force of the upper structure. This illustrates the importance of performing interaction analysis. At the same time, it can be seen that choosing different basic forms will also have a greater impact on the internal forces of the superstructure.