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Seismic dynamics of offshore breakwater on liquefiable seabed foundation
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.
Highlights Advanced numerical simulation of nonlinear interaction between breakwater and liquefiable seabed. Three-stage failure process of the breakwater is realistically simulated. Influence of structure on seismic dynamics of seabed soil is highlighted. Demonstrated great potential in geotechnical earthquake design of offshore structures.
Seismic dynamics of offshore breakwater on liquefiable seabed foundation
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.
Highlights Advanced numerical simulation of nonlinear interaction between breakwater and liquefiable seabed. Three-stage failure process of the breakwater is realistically simulated. Influence of structure on seismic dynamics of seabed soil is highlighted. Demonstrated great potential in geotechnical earthquake design of offshore structures.
Seismic dynamics of offshore breakwater on liquefiable seabed foundation
Ye, Jianhong (Autor:in) / Wang, Gang (Autor:in)
Soil Dynamics and Earthquake Engineering ; 76 ; 86-99
01.02.2015
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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