Influence of the Seabed Site and Island Structure on Seismic Response of Marine Artificial Islands

Compared with sea-crossing bridges, offshore fans and other marine structures, marine artificial islands are bottom-sitting structures, the characteristic of seismic response of marine artificial islands is different, and its seismic response is more sensitive to site condition. Besides, there are a seawater layer and complex site conditions on the seabed. Therefore, it is necessary to study on the seismic characteristics of marine artificial islands. In this paper, the marine artificial island is taken as the research object, and a seismic analysis model of seabed-seawater layer-artificial island coupling is established by combining the self-programmed fluctuation analysis program and the finite element dynamic analysis software. The study firstly analyzes the influence of the seawater layer, the site conditions, and the seismic incidence angle on the seismic response of the artificial island. Secondly, the effect of construction methods on the seismic response of artificial islands are discussed. The results show that the thickness of the soft silt layer on seabed and other factors can influence the seismic response of the seabed and the island structure. The results will help to improve the seismic safety of marine artificial islands and provide theoretical references for the site selection and construction method of marine artificial islands.