Seismic dynamics of offshore breakwater on liquefiable seabed foundation |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong SAR, China;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China;2. Griffith School of Engineering, Griffith University Gold Coast Campus, QLD, Australia;3. Center for Marine Geotechnical Engineering Research, Department of Civil Engineering, State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;4. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China;5. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, China;1. School of Civil Engineering, South West Jiaotong University, Sichuan 610031, China;2. Key Laboratory of Theory and Technology of High Speed Railway Structures, Ministry of Education, South West Jiaotong University, Sichuan 610031, China;3. Griffith School of Engineering, Griffith University Gold Coast Campus, QLD 4222, Australia;4. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China;1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China;2. Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland, QLD 4222, Australia;3. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Offshore structures, such as composite breakwaters, are generally vulnerable to strong seismic wave propagating through loose or medium-dense seabed foundation. However, the seismically induced failure process of offshore structures is not well understood. In this study, seismic dynamics of a composite breakwater on liquefiable seabed foundation is investigated using a fully coupled numerical model FSSI-CAS 2D. The computation results show that the numerical model is capable of capturing a variety of nonlinear interaction phenomena between the composite breakwater and its seabed foundation. The numerical investigation demonstrates a three-stage failure process of the breakwater under seismic loading. In this process, the far-field seabed can become fully liquefied first, inducing excessive settlement of the structure, followed by significant lateral movement and tilting of the structure when the near-field soil progressively liquefies. The study demonstrates great promise of using advanced numerical analysis in geotechnical earthquake design of offshore structures. |
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| Keywords: | Offshore breakwater Numerical simulation Seabed–structure interaction Liquefaction Seismic dynamics |
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