浅基础土-结构动力相互作用分析的宏单元
A Macro-Element for Dynamic Soil-Structure Interaction Analyses of Shallow Foundations
摘要：
本文的范围是提出一个“宏观元素”的发展浅基础的动态土-结构相互作用分析的一些方面。首先介绍了“宏单元”的概念，并借助于一个源于结构工程的非常简单的例子加以说明。然后，链接与浅基础的动态响应的建模和这样一个工具的目标和结构进行了描述，参考的具体配置的圆形基脚休息的表面上的异质纯粘性土。然后介绍了“宏单元”的主要特征;土-结构相互作用域被减少到与基脚中心重合的一点，所有（材料和几何）非线性都集中在这一点上。最适当的方式来对待这些非线性的讨论是根据早期的作品所获得的经验。建议利用多机制塑性理论，将非线性纳入模型中，形成统一的形式。最后给出了与地基地震承载力相对应的塑性模型极限面定义的初步结果。
英文摘要：
The scope of the paper is to present some aspects of the development of a "macro-element" for dynamic soil-structure interaction analyses of shallow foundations. Initially the concept of "macro-element" is introduced and is illustrated with the aid of a very simple example originating from structural engineering. Then the link is made with the modeling of the dynamic response of shallow foundations and the objectives and structure of such a tool are described with reference to the specific configuration of a circular footing resting on the surface of a heterogeneous purely cohesive soil. The principal features of the "macro-element" are then presented; the soil-structure interaction domain is reduced to a point that coincides with the center of the footing and all the (material and geometric) non-linearities are lumped at this point. A discussion on the most appropriate way to treat these non-linearities is undertaken based on experience gained with earlier works. It is suggested that the non-linearities be incorporated in the model within a unified formalism making use of the theory of multi-mechanism plasticity. Initial results concerning the definition of the ultimate surface for such a plasticity model, corresponding to the seismic bearing capacity of the foundation, are finally presented.
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