Centrifuge modeling of offshore wind foundations under earthquake loading |
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| Institution: | 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;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. Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106, United States;2. DNV GL, 1601 Rio Grande Street, Austin, TX 78701, United States;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, China;2. Ministry of Education (MOE) Key Laboratory of Soft Soils and Geoenvironmental Engineering, Dept. of Civil Engineering, Zhejiang Univ., Hangzhou 310058, China;1. University of Dundee, UK; formerly National Technical University of Athens, Greece;2. National Technical University of Athens, Greece;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. Country Garden, 19?F, Building 11, Nuode Zhong Xin, Fengtai District, Beijing, China;3. Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom |
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| Abstract: | The construction of large offshore wind turbines in seismic active regions has great demand on the design of foundations. The occurrence of soil liquefaction under seismic motion will affect the stability of the foundations and consequently the operation of the turbines. In this study, a group of earthquake centrifuge tests was performed on wind turbine models with gravity and monopile foundations, respectively, to exam their seismic response. It was found that the seismic behavior of models was quite different in the dry or saturated conditions. Each type of foundation exhibited distinct response to the earthquake loading, especially in the offshore environment. In the supplementary tests, several remediation methods were evaluated in order to mitigate the relatively large lateral displacement of pile foundation (by fixed-end pile and multi-pile foundation) and excessive settlement of gravity foundation (by densification, stone column, and cementation techniques). |
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| Keywords: | Cementation Centrifuge test Densification Foundation Liquefaction Liquefaction mitigation technique Offshore wind turbine Seismic response Stone column |
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