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| Ice force spectrum and analysis of ice-induced responses for offshore jacket platforms |
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| DOI：10.7511/jslx20085126 |
| KeyWord:offshore jacket platform,ice force spectrum,dynamic analysis |
| YUE Qian-jin LIU Yuan QU Yan SHI Zhong-min |
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| Abstract: |
| Based on the data of field observation,the ice force spectrum of narrow conical structures is established.The dynamic responses of JZ20-2MUQ platform in Liaodong Bay are chosen to validate the ice force spectrum.In the dynamic analysis,the damping ratio of the structure is gained using the free damping curve of acceleration from field monitoring in order to reduce the computing error.The maximal acceleration responses of the deck under ice combinational condition of various ice thickness and ice velocity are computed by spectrum method,and the computing results are compared with that of field monitoring.The comparative results reveal that the computing responses accord well with that of field monitoring,which proves the practicability of ice force spectrum built.And the metods and results in this paper can be used in field forecasting of ice-induce vibrations and safety evaluation of ice-resistant platforms. |
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