Comparison of the dynamic responses of monopiles and gravity base foundations for offshore wind turbines in sand using centrifuge modelling |
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Authors: | Marcos Massao Futai Stuart K Haigh Gopal SP Madabhushi |
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Affiliation: | 1. Department of Structural and Geotechnical Engineering, School of Engineering, University of Sao Paulo, Av. Prof. Luciano Gualberto, travessa 3 n° 380, CEP 05508-010 São Paulo, SP, Brazil;2. Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom |
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Abstract: | Monopiles and gravity base foundations (GBF) are two of the most commonly used foundations for offshore wind turbines. As resonance can cause damage and even failure of wind turbines, understanding the difference between the dynamic responses of monopiles and GBFs under free vibration is important. However there is little experimental data regarding their natural frequency, especially from model tests carried out at correct stress levels. This paper presents the results of novel monopile and GBF tests using a centrifuge to directly determine the natural frequency (fn) of the foundation-soil system. The natural frequencies of wind turbine monopiles and GBFs in centrifuge models were measured during harmonic loading using a piezo-actuator, with the results confirming that soil-structure interaction must be considered to obtain the system’s natural frequency as this frequency reduces substantially from fixed-base values. These results will contribute in preventing resonance induced damage in wind-turbines. |
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Keywords: | Centrifuge modelling Wind turbine foundation Monopile Gravity base foundation Natural frequency |
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