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A simplified Nonlinear Sway-Rocking model for evaluation of seismic response of structures on shallow foundations

机译：浅层基础上结构地震反应评估的简化非线性摇摆晃动模型

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摘要

This paper presents a simplified Nonlinear Sway-Rocking model as a preliminary design tool for seismic soil-structure interaction analysis. The proposed model is intended to capture the nonlinear load displacement response of shallow foundations during strong earthquake events where foundation bearing capacity is fully mobilised. Emphasis is given to heavily-loaded structures resting on a saturated clay half-space. The variation of soil stiffness and strength with depth, referred to as soil non-homogeneity, is considered in the model. Although independent springs are utilised for each of the swaying and rocking motions, coupling between these motions is taken into account by expressing the load displacement relations as functions of the factor of safety against vertical bearing capacity failure (FSv) and the moment-to-shear ratio (M/H). The simplified model has been calibrated and validated against results from a series of static push-over and dynamic analyses performed using a more rigorous finite difference numerical model. Despite some limitations of the current implementation, the concept of this model gives engineers more degrees of freedom in defining their own model components, providing a good balance between simplicity, flexibility and accuracy. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文提出了一种简化的非线性摇摆摇摆模型，作为地震土-结构相互作用分析的初步设计工具。所提出的模型旨在捕获在充分调动基础承载力的强烈地震事件中浅层基础的非线性载荷位移响应。重点放在饱和粘土半空间上的重载结构。在模型中考虑了土壤刚度和强度随深度的变化，称为土壤非均质性。尽管摇摆运动和摇摆运动均使用独立的弹簧，但通过将载荷位移关系表示为抵抗垂直承载力故障（FSv）和弯矩的安全系数的函数，可以考虑这些运动之间的耦合。比（M / H）。已针对简化模型进行了校准，并针对一系列使用更严格的有限差分数值模型进行的静态推覆和动态分析的结果进行了验证。尽管当前实现存在一些限制，但是此模型的概念为工程师定义自己的模型组件提供了更大的自由度，从而在简单性，灵活性和准确性之间实现了良好的平衡。 （C）2015 Elsevier Ltd.保留所有权利。

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