RESPONSE OF SHORT MONOPILES FOR OFFSHORE WIND TURBINE FOUNDATIONS: VIRGIN AND POST-CYCLIC CAPACITY

Francisco J. Grajales, Ryan D Beemer, Madhuri Murali, Charles P Aubeny, Giovanna Biscontin

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Foundations V / Fondations V

ABSTRACT: Geotechnical centrifuge tests were conducted to examine monotonic behavior of low aspect ratio piles in soft clays. Monopiles with aspect ratio of two were tested in the 150g-ton centrifuge at Rensselaer Polytechnic Institute. Initial pile test results include force-displacement for displacement controlled loading. This paper focuses on ultimate capacity of short aspect ratio monopiles after cyclic loading. Post-cyclic monotonic capacity is compared to virgin monotonic capacity for pure rotational loading over a range of eccentricities.

RÉSUMÉ: Des essais géotechniques rapport longueur-diamètre dans les argiles molles. Des monopieux avec un rapport longueur-diamètre de deux ont été testés dans la centrifugeuse de 150g-tonnes au Rensselaer Polytechnic Institute. Les résultats des essais de pieux comprennent les courbes force-déplacement pour le chargement en déplacement contrôlé. Cet article se concentre sur la capacité ultime des monopieux à faible rapport longueur-diamètre après un chargement cyclique. La capacité monotone post-cyclique est comparée à la capacité monotone vierge pour le chargement en rotation pure, et ce sur une

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