Numerical analysis of lateral – Moment capacity of bucket foundations for offshore wind turbine in sand |
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Institution: | 1. South China Institute of Geotechnical Engineering, School of Civil Engineering and Transportation, South China University of Technology, 381 Wushan Rd., Guangzhou 510640, China;2. School of Engineering and Technology, Central Queensland University Australia, Bryan Jordan Drive, Gladstone, QLD 4680, Australia;3. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Australia;4. School of Marine Science and Engineering, South China University of Technology, 381 Wushan Rd., Guangzhou 510640, China |
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Abstract: | This paper reports the lateral – moment bearing capacity of bucket foundations under lateral loading in sand. The Modified Mohr-Coulomb (MMC) model is adopted to capture the hardening – softening behaviour in medium dense and dense sands within a finite element (FE) modelling framework. The FE model performance is assessed against available field test data as well as analytical solutions showing a relatively good agreement. A series of parametric study is conducted to investigate the effects of bucket aspect ratio, bucket diameter, load eccentricity, vertical load and relative density of sand on the lateral - moment bearing capacity of the bucket. Comparisons are drawn between the conventional Mohr-Coulomb (MC) model and the stress dependent MMC model highlighting the role of sand dilatancy in mobilising the lateral moment capacity. Based on the FE results, a simple stepwise calculation framework is proposed for two scenarios: (i) to predict the lateral - moment bearing capacity of the bucket if the bucket dimensions are known, and (ii) to design the bucket dimensions for a known required bucket capacity. |
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Keywords: | Offshore wind turbine Modified mohr-coulomb model Lateral Moment capacity Finite element analysis Sand Bucket foundation |
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