University of Birmingham Non-linear finite element analysis of grouted connections for offshore monopile wind turbines
University of Birmingham Non-linear finite element analysis of grouted connections for offshore monopile wind turbines
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发表时间：
2018
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通讯作者：
Nikolaos I. Tziavos;H. Hemida;N. Metje;C. Baniotopoulos
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作者：
Nikolaos I. Tziavos;H. Hemida;N. Metje;C. Baniotopoulos
- - 摘要 - - 12 灌浆连接 (GC) 是海上风力涡轮机 (OWT) 13 子结构的重要结构组件。为了实现 GC，在单桩上使用高 14 强度灌浆现场固定管状空心钢桩。单桩在海上环境中容易受到大幅弯曲载荷的影响。 15 最近，检查后，GC 的性能受到质疑，因为数个单桩上出现了沉降 16。为了进一步了解 GC 在 17 个大弯矩下的结构性能，进行了非线性有限元 (FE) 分析。三维 FE 18 模型已根据实验和分析数据进行求解和验证，具有良好的一致性。 19 建议所提出的模型可用于准确评估 GC 20 的全局和局部行为。最后，进行了全面的参数研究，研究了21个剪切键数量、剪切键间距和重叠长度的影响。结果表明，增加剪切键22的数量有利于刚度并减少界面处的间隙，而灌浆破坏23取决于相邻剪切键之间的间距。数值模型还能够追踪由剪切键间距引起的所有 24 种相关失效模式。 25
- - Abstract - - 12 Grouted Connections (GCs) are vital structural components of Offshore Wind Turbine (OWT) 13 substructures. On monopiles to achieve a GC, tubular hollow steel piles are in-situ attached with a high-14 strength grout. Monopiles are susceptible to large magnitude bending loads in offshore environments. 15 Recently, following inspections the performance of GCs has been called into doubt when settlements 16 were reported on several monopiles. To further comprehend the structural performance of GCs under 17 large bending moments a nonlinear Finite Element (FE) analysis was conducted. Three-dimensional FE 18 models were solved and validated against experimental and analytical data with good agreement. It is 19 suggested that the presented models can be used to evaluate the global and local behaviour of a GC 20 accurately. Finally, a comprehensive parametric study was carried out to investigate the influence of 21 shear key numbers, shear key spacing and overlap lengths. It was shown that increased number of shear 22 keys are advantageous for stiffness and reduce the gap at the interfaces, whereas the grout failure 23 depends on the spacing between neighbouring shear keys. The ability of the numerical model to trace all 24 relevant failure modes which are provoked by shear key spacing was also demonstrated. 25