Effect of variation of the loading direction on the displacement accumulation of large-diameter piles under cyclic lateral loading in sand
Effect of variation of the loading direction on the displacement accumulation of large-diameter piles under cyclic lateral loading in sand
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DOI：
10.1139/cgj-2013-0438
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发表时间：
2014-08
影响因子：
3.6
通讯作者：
C. Rudolph;B. Bienen;J. Grabe
中科院分区：
文献类型：
--
作者：
C. Rudolph;B. Bienen;J. Grabe
支撑海上结构物的基础桩承受由波浪和风引起的循环横向载荷，在结构物的使用寿命期间，这些载荷通常不是单向的。本文介绍了离心实验的结果，在砂中，代表一个大直径的原型测试应力水平相似的领域进行循环横向载荷从不同的方向。结果表明，增加的变形积累，由于改变加载方向，相比单向的情况下。位移累积不仅限于主荷载方向，还包括横向位移。在小规模1g建模中观察到类似的趋势，允许应用更多的负载循环。离心试验结果提供了信心的结果，原型的适用性。目前的方法忽略了荷载方向变化的影响，将提供不协调的桩的位移累积的预测。
Foundation piles supporting offshore structures experience cyclic lateral loading arising from waves and wind, which are not typically uni-directional over the lifetime of the structure. This paper presents results from centrifuge experiments in sand, representing a large diameter prototype tested at stress levels similar to the field subjected to cyclic lateral loading from varying directions. The results demonstrate increased deformation accumulation due to the changing loading direction, compared to the uni-directional case. Displacement accumulation is not limited to the main loading direction but includes transverse movement as well. Similar trends were observed in small-scale 1g modelling that allowed a larger number of load cycles to be applied. The centrifuge test results provide confidence of the applicability of the findings to the prototype. Current methods that neglect the effect of variation of the loading direction will provide predictions of displacement accumulation of piles that are un-co...