Key issues and suggestions for ice-resistant design of offshore platform structures in China
Bohai Sea is an important oil and gas producing region in China.However,ice forms in the region during winter,making the ice-resistant design of offshore platform structures crucial for ensuring the increase and storage of oil and gas production.The ice-resistant design of offshore platforms in the Bohai Sea has undergone four developmental stages:initiation,exploration,international cooperation,and independent innovation.The key issues faced in the ice-resistant design of offshore platform structures in the Bohai Sea of China were systematically summarized,and relevant research recommendations were provided.In terms of ice design conditions,due to the impact of global climate change,the overall ice conditions in China have been alleviated.The division of existing ice zones is not detailed enough,and some ice zone parameters differ significantly from actual ice conditions.The design parameters for overlapping ice overlook differences between ice zones.Therefore,it is recommended to conduct high-precision ice zone division studies based on the latest satellite remote sensing,operational forecasts,and measured data and explore reasonable values for overlapping ice thickness and strength in engineering design.In terms of static ice load calculation methods for structures,the existing methods are not applicable under conditions of large diameter-to-thickness ratios.It is thus recommended to establish new ice force formulas based on on-site ice force measurements and ice tank model tests and thoroughly investigate the shielding coefficient and non-simultaneous failure coefficient of multi-leg structures.In terms of dynamic ice-resistant design methods,there is currently a lack of clear executable regulations,and a unified dynamic ice force model and fatigue analysis algorithm have not been established.Therefore,it is suggested to construct a reasonable probabilistic distribution model of ice parameters and formulate design and evaluation methods for ice-induced platform vibration and fatigue design.The related research findings provide references for the optimization of the ice-resistant design of platform structures in the Bohai Sea of China and point out the direction of future research.
Bohai Seaoffshore platformsice-resistant designice design conditionsice zone divisionice loadice-induced vibration
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