Coupled hydrodynamic and geotechnical analysis of jacket offshore wind turbine |
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| Institution: | 1. China University of Petroleum-Beijing, Ocean Oil-Gas Research Center, Beijing 102249, China;2. SAWS Key Laboratory For Oil–Gas Safety Engineering Center, Beijing 102249, China;3. COTEC Offshore Engineering Solutions, Beijing, China;1. Department of Civil and Environmental Engineering, University of Massachusetts Amherst, United States;2. Department of Civil and Environmental Engineering, Northeastern University, United States;1. Shandong Province Key Laboratory of Ocean Engineering, Ocean University of China, 238, Songling Road, Qingdao 266100, China;2. Department of Ocean Engineering, Ocean University of China, Qingdao 266100, China;3. Huadong Engineering Corporation, Hangzhou 310014, China;1. University of Surrey, United Kingdom;2. Robert Bird Group, United Kingdom |
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| Abstract: | This paper compares the response of a jacket-supported offshore wind turbine (OWT) under wave loading, when (a) soil–structure interaction (SSI) is ignored and (b) SSI is considered. The jacket is placed in a water depth of 70 m and soil conditions off the west coast of India are used in the study. The rotor of the OWT is considered to be parked, under a survival average wind speed of 50 m/s, significant waver height Hs=16 m and peak spectral period Tp=18 s. The significance of includng SSI in OWT studies is investigated by means of pushover analyses and irregular-wave dynamic analyses. Modal studies are performed to determine the variation in the free-vibration response of the two cases. It is observed that ignoring SSI tends to over-estimate the ultimate strength characteristics of the OWT by 3–60% in various modes or increase the tower top displacement above serviceable limit. For dynamics analysis, the wave elevation is generated using wave superposition method. The JONSWAP wave spectrum is discretized using constant area method which introduces additional uncertainty. The analysis shows that approximately 200 frequencies are necessary using constant area method to capture the tail region appropriately. Also the statistical uncertainty in the generation of wave elevation for dynamic analyses is quantified by means of sample convergence studies. The results show that approximately 20–40 samples are required in order to obtain reasonable statistics. |
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| Keywords: | Jacket offshore wind turbine Soil–structure interaction Nonlinear dynamic analysis Hydrodynamic uncertainty Random wave loading |
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