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Evidence of beneficial role of inclined piles: observations and summary of numerical analyses

机译：斜桩的有益作用的证据：数值分析的观察与总结

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The behaviour under seismic loading of inclined piles embedded in two idealized soil profiles, a homogeneous and a non-homogenous "Gibson" soil, is analysed with 3D finite elements. Two structures, modeled as single-degree-of-freedom oscillators, are studied: (1) a tall slender superstructure (H (st) = 12 m) whose crucial loading is the overturning moment, and (2) a short structure (H (st) = 1 m) whose crucial loading is the shear force. Three simple two-pile group are studied: (a) one comprising a vertical pile and a pile inclined at 25 degrees, (b) one consisting of two piles symmetrically inclined at 25 degrees, and (c) a group of two vertical piles. The influence of key parameters is analysed and non-dimensional diagrams are presented to illustrate the role of raked piles on pile and structure response. It is shown that this role can be beneficial or detrimental depending on a number of factors, including the slenderness of the superstructure and the type of pile-to-cap connection.
机译：利用3D有限元分析了倾斜桩在地震荷载作用下的行为，该倾斜桩嵌入两个均质和非均质的“吉布森”土壤中。研究了以单自由度振荡器为模型的两种结构：（1）细长的上部结构（H（st）= 12 m），其临界载荷为倾覆力矩;（2）较短的结构（H （st）= 1 m），其临界载荷为剪切力。研究了三个简单的两桩组：（a）一个由垂直桩和倾斜25度的桩组成的组;（b）一个由两个以25度对称倾斜的桩组成的桩;以及（c）两个垂直桩的组。分析了关键参数的影响，并提供了无量纲图以说明倾斜桩对桩和结构响应的作用。结果表明，该作用可能是有益的或有害的，取决于许多因素，包括上部结构的细长性和桩帽连接的类型。

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