堆
海上风力发电
基础(证据)
涡轮机
波浪荷载
岩土工程
非线性系统
结构工程
海洋岩土工程
固有频率
海底管道
工程类
作者
Stephen A. Williams,Loizos Pelecanos,Antony P. Darby
出处
期刊:Geotechnique
[Thomas Telford Ltd.]
日期:2022-03-21
卷期号:: 1-43
标识
DOI:10.1680/jgeot.21.00260
摘要
Monopile mounted offshore wind turbines (OWTs) are expected to experience a very large number of cyclic loads throughout their operational lifetime, and the existing p-y method of foundation modelling does not fully account for the effects of dynamic cyclic loading, such as pile-soil gapping. In this paper a dynamic model based on the beam-on-nonlinear-Winkler-foundation scheme with a novel algorithm capable of capturing the effects of pile-soil gapping is presented. It can account for gap cave in, and the resulting gap size can react dynamically to changing loading amplitudes, using only two calibration parameters. Static and dynamic cyclic loaded model validations are presented, and give very good agreement to experimental results, performing better than existing p-y curves for dynamic loading. The model is also applied to an OWT case study and predictions of natural frequency reduction due to soil erosion agree well with measured results. It is shown that the inclusion of gapping may result in a significant decrease to the natural frequency prediction of OWTs relative to the value predicted without gapping. As such, not considering gapping could lead to unconservative predictions, and any additional soil degradation throughout the serviceable lifetime could therefore result in unwanted resonance. The method provided in this paper provides a simple and accurate model to predict this behaviour which is crucial to ascertain during the design phase.
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