Joint earthquake and wave action on the monopile wind turbine foundation: An experimental study |
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| Institution: | 1. Division of Ocean Science and Technology, Shenzhen Graduate School, Tsinghua University, Tsinghua Campus, University Town, Shenzhen 518055, China;2. School of Naval Architecture, Dalian University of Technology, Ling Gong Road 2, Dalian 116024, China;3. POWERCHINA Huadong Engineering Corporation, Offshore Wind Power R&D Center of POWERCHINA Huadong, Hangzhou 310014, China;1. Technology and Engineering Solutions, Vestas Wind Systems A/S, Hedeager 42, 8200 Aarhus, Denmark;2. Department of Civil Engineering, Aalborg University, Sohngårdsholmsvej 57, 9000 Aalborg, Denmark;1. Institute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China;2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China;1. University of Dundee, UK; formerly National Technical University of Athens, Greece;2. National Technical University of Athens, Greece;1. Department of Civil and Environmental Engineering, Florida A&M University, Florida State University College of Engineering, Tallahassee, FL, USA;2. Department of Civil Engineering, Dong-A University, Busan, Korea;3. Civil, Structure & Architectural Engineering Team, Global Engineering Technology, Seoul, Korea;1. Missouri University of Science and Technology, Civil, Architectural, and Environmental Department, 211 Butler-Carlton Hall, 1401 N. Pine St., Rolla, MO 65409, USA;2. University of Oklahoma, School of Civil Engineering and Environmental Science, 423 Carson Engineering Center, Norman, OK 73019, USA;1. Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106, United States;2. Department of Civil Engineering, Wenzhou University, Zhejiang, China;3. School of Civil Engineering, Tianjin University, Tianjin, China |
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| Abstract: | Offshore wind turbines in regions of active seismicity are under a potential threat caused by the joint earthquake and ocean wave action. Taking NREL-5MW monopile wind turbine as the prototype, this study is devoted to probe the joint action of strong earthquakes and moderate sea conditions. A series of shake table model tests of scale 30:1 have been carried out by the contemporary world unique facility (Earthquake, Wave and Current Joint Simulation System) to investigate the structural response in dry flume, low and high calm water levels, with and without regular or random waves. Particular interest has been in the nacelle acceleration subjected to strong ground motions as well as to random waves. The experimental results of nacelle peak accelerations and corresponding dynamic amplification factors show that the joint earthquake and wave action is important for the proper evaluation of structural response. Ignoring the effect of wave action in seismic analysis will lead to underestimation of structural response, especially when the monopile foundation is dynamically sensitive. The coupling of earthquake and wave actions is sourced not only from the relative velocity of vibration but also from the initial condition induced by waves. It has been also derived that the peak acceleration excited by a moderate sea condition is comparable to that by a moderate earthquake. |
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| Keywords: | Joint action Earthquake Morison force Dynamic amplification factor Monopile foundation |
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