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Three-dimensional finite element analysis of the seismic behavior of inclined micropiles

机译：倾斜微桩抗震性能的三维有限元分析

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This paper presents a thorough study of the behavior of inclined micropiles under seismic loading. Analysis is carried out using a full three-dimensional finite element modeling. The soil media is assumed to be elastic with Rayleigh damping, while micropiles are modeled as 3D elastic beam elements. The structure is described by a single degree of freedom system composed of a concentrated mass and a column. The paper is composed of four parts. The first part includes a literature survey on the behavior of inclined micropiles. The second part presents the numerical model used in this study. The third part concerns analysis related to the influence of micropiles inclination on the seismic behavior of a group of micropiles embedded in a homogeneous soil with a uniform stiffness. The last part deals with the seismic behavior of inclined micropiles embedded in a soil layer with a depth-based increasing stiffness. The results of this study provide valuable information about the influence of micropiles inclination on dynamic amplification and on the seismic-induced internal forces in micropiles.
机译：本文对倾斜微桩在地震作用下的行为进行了全面的研究。使用完整的三维有限元建模进行分析。假定土壤介质在瑞利阻尼下具有弹性，而微桩则建模为3D弹性梁单元。通过一个由集中质量和圆柱组成的单自由度系统描述结构。本文共分四个部分。第一部分包括有关倾斜微型桩行为的文献调查。第二部分介绍了本研究中使用的数值模型。第三部分涉及与微桩倾角对嵌在均质刚度均匀的均质土壤中的一组微桩的地震行为的影响有关的分析。最后一部分讨论了基于深度的增加的刚度，嵌入土壤层中的倾斜微桩的抗震性能。这项研究的结果提供了有关微桩倾角对动态放大的影响以及地震引起的微桩内力的有价值的信息。

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