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Minimum embedded length of cyclic horizontally loaded monopiles / Kuo, Yu-Chi in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 3 (Mars 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 3 (Mars 2012) . - pp. 357-363 Titre : Minimum embedded length of cyclic horizontally loaded monopiles Type de document : texte imprimé Auteurs : Kuo, Yu-Chi, Auteur ; Martin Achmus, Auteur ; Khalid Abdel-Rahman, Auteur Année de publication : 2012 Article en page(s) : pp. 357-363 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Piles  Monopiles  Cyclic  loads  Numerical  analysis  Finite  element  method  Offshore  structures Résumé : 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. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i3/p357_s1?isAuthorized=no [article] Minimum embedded length of cyclic horizontally loaded monopiles [texte imprimé] / Kuo, Yu-Chi, Auteur ; Martin Achmus, Auteur ; Khalid Abdel-Rahman, Auteur . - 2012 . - pp. 357-363. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 3 (Mars 2012) . - pp. 357-363 Mots-clés : Piles  Monopiles  Cyclic  loads  Numerical  analysis  Finite  element  method  Offshore  structures Résumé : 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. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i3/p357_s1?isAuthorized=no