| With the development of modern industrial processes, the consumption of oil and gas resources has become more and more heavy, which would be a key issue that constrains China's economic development. In South Sea of China, there are rich reserves of oil and gas that haven't been well exploited and utilized due to the limitation of water depth. Hence, speeding up the deepwater exploitation of resources in China's South Sea is of vital importance to the economic development of China.As a key component of deep-sea mining equipments, the riser system plays an indispensable role in drilling and transporting oil/gas. However, due to its slender structural feature, the failure of deep-sea riser can easily occur under the actions of various complex environmental loads. Once the riser is damaged, it will cause not only great economic losses but also serious secondary disasters due to gas/oil leak. So the safety of the riser has always been one of the study focuses of deep-water resource development projects.About the design of the marine riser, generally, only sea conditions with a return period of not more than 100 years will be taken into account in relevant rules. Considering the disastrous marine environment with a return period of more than 100 years which may occur in the south sea of china, a direct strength calculation will be needed to assess the structural safety of the deep-sea riser.In this paper, first, the movement response of the floating platform in disastrous marine environments is obtained through the full coupling analysis method by software DeepC of DNV, and then the random dynamic response of the deep-sea riser is analyzed by ABAQUS with the joint actions of environmental loads taken into account. Furthermore, the random result data is fitted based on the generalized extreme value theory and then compared with the allowable stress given in relevant rules. Finally, the safety assessment of the deep-sea riser in disastrous marine environments is achieved.
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