Minimum Embedded Length of Cyclic Horizontally Loaded Monopiles
- 1 March 2012
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of Geotechnical and Geoenvironmental Engineering
- Vol. 138 (3), 357-363
- https://doi.org/10.1061/(asce)gt.1943-5606.0000602
Abstract
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.Keywords
This publication has 4 references indexed in Scilit:
- Behavior of monopile foundations under cyclic lateral loadComputers and Geotechnics, 2009
- Numerical modelling of large diameter steel piles under monotonic and cyclic horizontal loadingPublished by Taylor & Francis Ltd ,2007
- Effects of Cyclic Lateral Loads on Piles in SandJournal of Geotechnical Engineering, 1994
- The response of flexible piles to lateral loadingGéotechnique, 1981