Minimum Embedded Length of Cyclic Horizontally Loaded Monopiles
Minimum Embedded Length of Cyclic Horizontally Loaded Monopiles
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DOI：
10.1061/(asce)gt.1943-5606.0000602
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发表时间：
2012-03
影响因子：
3.9
通讯作者：
Yu-Shu Kuo;Yu-Shu Kuo;M. Achmus;K. Abdel-Rahman
中科院分区：
文献类型：
--
作者：
Yu-Shu Kuo;Yu-Shu Kuo;M. Achmus;K. Abdel-Rahman
单桩用作海上风能塔的基础结构。为了确保在循环荷载条件下的稳定行为，通常需要最小嵌入长度。为此，使用了不同的设计标准，其中一些标准导致大直径桩的嵌入深度非常大。这些标准的适用性进行了测试，通过数值模拟。考虑到循环载荷，一种新的方法称为刚度退化法。参数研究的结果表明，所使用的设计标准确实可以确保在静态和循环荷载下的最佳桩性能。建议将极限荷载作用下桩身挠度最小的临界桩长作为设计准则。对于所考虑的情况，与超长桩的最佳情况相比，该要求仅导致略微更大的循环变形。进一步优化所需的悬臂长度相对于循环荷载是可能的，但需要具体考虑循环行为，如本文所做的。DOI：10.1061/（ASCE）GT.1943-5606.0000602。© 2012美国土木工程师协会。CE数据库主题词：桩;循环荷载;数值分析;有限元法;海洋结构物。作者关键词：桩;单桩;循环荷载;数值分析;有限元法;海洋结构物。
Monopiles are used as foundation structures for offshore wind energy towers. To ensure stable behavior of the monopile under cyclic loading conditions, a minimum embedded length is usually required. For this, different design criteria are used, some of which result in very large embedded depths for large-diameter monopiles. The suitability of these criteria is tested by means of numerical simulations. To account for cyclic loading, a new approach called the stiffness degradation method is applied. The results of a parametric study show that the design criteria used can indeed ensure optimum pile performance under static and cyclic loads. It is recommended that the requirement of a critical pile length, which leads to the minimum pile deflection under extreme load, is used as a design criterion. For the cases considered, this requirement results in only slightly greater cyclic deformations compared to the optimum case of very long piles. A further optimization of the required monopile length with respect to cyclic loading is possible, but requires specific consideration of cyclic behavior, as is done in this paper. DOI: 10.1061/(ASCE)GT.1943-5606.0000602. © 2012 American Society of Civil Engineers. CE Database subject headings: Piles; Cyclic loads; Numerical analysis; Finite element method; Offshore structures. Author keywords: Piles; Monopiles; Cyclic loads; Numerical analysis; Finite element method; Offshore structures.