Empirical models for the nonlinear rocking response of shallow foundations
Empirical models for the nonlinear rocking response of shallow foundations
复制标题
浅基础非线性摇摆响应的经验模型
DOI：
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复制
发表时间：
2022
影响因子：
4.6
通讯作者：
M. Soltani
中科院分区：
文献类型：
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作者：
S. Hamidpour;H. Shakib;R. Paolucci;A. Correia;M. Soltani
本文旨在引入简单的经验模型来描述摇摆振动下浅基础的非线性行为。该模型是基于对均质致密干砂上矩形表面基础的参数化数值研究而开发的，利用了基于一组实验结果验证的非线性宏观单元模型。提出的经验表达式包括力矩-旋转主曲线、刚度退化和等效阻尼比以及地基沉降与累积旋转的相关性。这些表达式主要作为旋转、静态安全系数和基础纵横比的函数提供。与之前的研究类似，尽可能引入抬升参考旋转作为新的闭合形式表达式的归一化参数，以便以无量纲形式表示。所提出的方法旨在简单，以尽量减少对可变参数的依赖，并为工程应用提供物理上合理的选择。
This paper aims to introduce simple empirical models to describe the nonlinear behavior of shallow foundations under rocking vibration. The model is developed based on parametric numerical investigations of rectangular surface footings on homogenous dense dry sand, taking advantage of a nonlinear macro-element model verified based on a set of experimental results. The proposed empirical expressions include the moment-rotation backbone curve, stiffness degradation and equivalent damping ratio as well as the correlation of the foundation settlements with cumulated rotations. These expressions are provided mainly as a function of the rotation, static factor of safety and aspect ratio of foundation. Similar to previous researches, the uplift reference rotation was introduced as a normalization parameter for the new closed-form expressions to be expressed in a non-dimensional form, whenever possible. The proposed approach aimed to be simple, in order to minimize the dependence on the variable parameters, and to provide physically sound selections for engineering applications.