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Uncertainty analysis of soil-pile interactions of monopile offshore wind turbine support structures |
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| Affiliation: | 1. NTNU, Department of Marine Technology, Trondheim, Norway;2. MARIN, Wageningen, The Netherlands;1. Technology & Service Solutions, Vestas Wind Systems A/S, Hedeager 42, 8200 Aarhus, Denmark;2. Department of Civil Engineering, Aalborg University, Sofiendalsvej 9-11, 9200 Aalborg, Denmark;3. Wind Energy Division, Risø-DTU, Frederiksborgvej 399, 4000 Roskilde, Denmark;1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;2. Zhejiang Electric Power Design Institute, Zhejiang, Hangzhou 310012, China;3. University of Surrey, Department of Civil and Environmental Engineering, Guildford, Surrey GU2 7XH, UK;1. Norwegian University of Science and Technology (NTNU), Trondheim, Norway;2. Norwegian Geotechnical Institute (NGI), Oslo, Norway;1. Department of Civil & Environmental Engineering, University of Massachusetts – Amherst, 130 Natural Resources Road, Amherst, MA 01003, USA;2. Norwegian Geotechnical Institute, Sognsveien 72, 0855 Oslo, Norway;3. Department of Civil & Environmental Engineering, Northeastern University, Boston, MA 02115, USA |
| Abstract: | The objective of this work is to study the uncertainties involved in the modelling of the soil-pile interaction concerning their influence on the prediction of the dynamic structural response of monopile offshore wind turbine support structures. Two main issues are identified and addressed: the adequacy of the method used to deal with the soil-pile interactions and the adequacy of the soil properties reflecting the behaviour of the soil. The present study develops an approach that defines the penetrated pile length depending on the soil profile. Also, a parameter is defined to avoid the excessive usage of steel for the penetrated pile structure. The uncertainties are included in the probabilistic free vibration analysis and the contribution of each random variable to the scatter of the response is estimated by performing a sensitivity analysis. The results indicate that the uncertainty involved in the modelling of the soil profile has a significant effect on the coefficient of variance of the natural frequency, which is a serious issue to be considered in the fatigue life assessment of offshore wind turbine support structures. |
| Keywords: | Soil-pile interaction Modelling uncertainty Offshore wind Monopile Free vibration analysis Natural frequency |
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