Abstract The seismic behavior of a suction bucket foundation for offshore wind turbine systems is studied using centrifuge model tests with a scaling factor of 1/100 and an effective stress analysis based on the strain space multiple mechanism model implemented in the FLIP computer code ( F inite element analysis program of Li quefaction P rocess). The primary dimensional parameters of the prototype scale suction bucket foundations selected for this study are as follows: skirt length L = 8 m, diameter D = 19 m, L = 9 m and D = 12 m. Placed on firmly compacted saturated sand, suction bucket foundations supporting an idealized wind turbine tower 100 m in height are subject to a recorded earthquake motion with a peak acceleration of 0.25g. Results of the model tests and the analyses indicate that the constitutive model used in this study is capable of capturing the essential features of the seismic behavior of offshore wind turbine systems supported by suction bucket foundation. In particular, this model is capable of evaluating the confining effect of a suction bucket on the increase in excess pore water pressure inside the bucket in response to the vertical confining pressure applied from the tower and shaft structure of the wind turbine system. This model is also capable of evaluating the inertia effects of the tower and shaft structure above the foundation affecting the driving mudline moment and shear, which leads to the deformation of the suction bucket in terms of rotation. The residual inclination of the tower is less than 0.001 rad, which satisfies the design criteria, and has a rotation angle of 0.005 rad. The strain space multiple mechanism model is applied to a general combination of static and cyclic loads in storm conditions. The computed results are consistent with those of a proposed cyclic load response diagram based on 1 g model tests at partially drained conditions in an earlier study by Nielsen et al. (2017), suggesting the applicability of this model to general load conditions is reasonable.

中文翻译：

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地震荷载作用下带吸水桶基础的海上风电机组离心模型试验及有效应力分析

摘要 利用比例因子为 1/100 的离心机模型试验和基于 FLIP 计算机代码（Finite）中实现的应变空间多机制模型的有效应力分析，研究了海上风力涡轮机系统吸水桶基础的抗震性能。 Li液化过程的元素分析程序）。本研究选择的原型吸水桶基础的主要尺寸参数如下：裙长 L = 8 m，直径 D = 19 m，L = 9 m 和 D = 12 m。吸力桶基础放置在牢固压实的饱和砂土上，支撑着高度为 100 m 的理想化风力涡轮机塔架，经受记录的地震运动，峰值加速度为 0.25g。模型试验和分析的结果表明，本研究中使用的本构模型能够捕捉由吸力桶基础支撑的海上风力涡轮机系统的地震行为的基本特征。特别是，该模型能够评估吸力桶对从风力涡轮机系统的塔架和轴结构施加的垂直围压作用下的吸力桶内超孔隙水压力增加的围压效应。该模型还能够评估基础上方的塔架和竖井结构的惯性效应，影响驱动泥线力矩和剪切力，从而导致吸力桶在旋转方面的变形。塔的残余倾角小于0.001弧度，满足设计标准，并具有 0.005 弧度的旋转角度。应变空间多重机制模型适用于风暴条件下静态和循环载荷的一般组合。计算结果与 Nielsen 等人早期研究中基于 1 g 模型测试在部分排水条件下提出的循环载荷响应图的结果一致。(2017)，表明该模型对一般负载条件的适用性是合理的。