Physical experiments provide the best representation of foundation behaviour in any environmental conditions offshore; however, they are very costly, especially since the on-site conditions vary. Hence, it is not a cost-effective approach. In contrast, numerical modelling is relatively cheaper, but requires long computation time and a high level of expertise to perform a successful numerical calculation. The main objective of this paper is to develop a simple and fast response analysis that requires less computational time and expertise. First, an analytical model is developed to study the dynamic behaviour of the pile by extending the beam on an elastic foundation. Second, the analytical results are verified by using the finite-element software, Abaqus. Finally, a parametric study is carried out with the established numerical calculation model to investigate the modal shapes of the pile model, limit states of the offshore wind turbine (OWT) and pile capacity for different loading conditions and aspect ratios. The proposed analytical model demonstrates a degree of error less than 10%, indicating great reliability and the potential for practical application. The parametric results indicate that the OWT is more likely to fail by yielding than buckling and the soil resistance at the pile periphery is highly affected by the aspect ratio.

中文翻译：

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风浪载荷作用下海上风电机组单桩基础动力响应

物理实验最能代表离岸任何环境条件下的地基行为；然而，它们非常昂贵，特别是因为现场条件各不相同。因此，这不是一种具有成本效益的方法。相比之下，数值建模相对便宜，但需要较长的计算时间和高水平的专业知识才能成功进行数值计算。本文的主要目标是开发一种简单快速的响应分析，需要更少的计算时间和专业知识。首先，开发了一个分析模型，通过在弹性地基上延伸梁来研究桩的动态行为。其次，利用有限元软件Abaqus对分析结果进行了验证。最后，利用已建立的数值计算模型进行参数化研究，研究桩模型的模态形状、海上风力涡轮机（OWT）的极限状态以及不同加载条件和纵横比下的桩承载力。所提出的分析模型表明误差度小于 10%，表明具有很高的可靠性和实际应用的潜力。参数化结果表明，OWT 更容易因屈服而不是屈曲而失效，并且桩周边的土壤阻力受纵横比的影响很大。表明具有很高的可靠性和实际应用的潜力。参数化结果表明，OWT 更容易因屈服而不是屈曲而失效，并且桩周边的土壤阻力受纵横比的影响很大。表明具有很高的可靠性和实际应用的潜力。参数化结果表明，OWT 更容易因屈服而不是屈曲而失效，并且桩周边的土壤阻力受纵横比的影响很大。