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Vertical dynamic impedance of suction caissons

机译：吸入沉箱的垂直动态阻抗

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Nowadays, suction caissons are being increasingly deployed as foundations to support offshore wind turbines (OWTs). Due to the overturning moment induced by waves and wind, vertical forces are the dominating ones acting on these foundations. In this study the dynamic stiffness and damping coefficients of suction caissons embedded in a viscoelastic soil layer over bedrock, subjected to vertical dynamic load were investigated. Numerical analyses of representative 3D finite element models were performed, while the numerical modelling was validated against existing analytical solutions for end bearing piles. The vertical dynamic response of suction caissons was evaluated by considering the effects of the foundation's geometry, i.e. the slenderness ratio, and the stiffness of the soil layer on the vertical dynamic impedance of suction caissons. Results showed that the overall dynamic response is profoundly affected by the skirt length and by the variation of soil stiffness with depth.Mathematical expressions of the dynamic stiffness and damping coefficients were derived pertaining to foundations with various slenderness ratios and embedded in different soil profiles. The proposed expressions can be implemented in structural models used for the dynamic analysis of the support structure of a wind turbine, taking thus into consideration the effects of soil-structure-interaction. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：如今，越来越多的吸水沉箱被用作支撑海上风力涡轮机（OWT）的基础。由于波浪和风引起的倾覆力矩，垂直力是作用在这些基础上的主要力。在这项研究中，研究了在垂直动载荷下嵌入基岩粘弹性土层中的吸水沉箱的动力刚度和阻尼系数。进行了具有代表性的3D有限元模型的数值分析，同时针对端轴承桩的现有分析解决方案对数值模型进行了验证。吸水沉箱的竖向动力响应是通过考虑地基的几何形状即细长比和土层的刚度对吸水沉箱的竖向动态阻抗的影响来评估的。结果表明，裙边长度和土体刚度随深度的变化对整体动力响应产生了深远的影响。得出了动刚度和阻尼系数的数学表达式，涉及不同细长比的地基，并嵌入了不同的土壤剖面。考虑到土壤-结构-相互作用的影响，可以在用于风机支撑结构动态分析的结构模型中实现所提出的表达式。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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