渤海海域导管架平台冰激疲劳研究

Research on Ice Induced Fatigue of a Jacket Platform in Bohai Sea

随全球气候变暖,渤海海域冰边缘区占比不断升高,冰边缘区复杂的动力学条件使得渤海海域导管架平台的冰激疲劳问题引起人们更多关注。本文使用ANSYS有限元软件对渤海某海域一导管架平台进行了冰激疲劳分析。文中首先根据该海域冬季冰情条件,设置了合理的冰激疲劳分析工况。由概化冰力函数确定了各分析工况下的动冰力时程,进而对导管架平台进行了全时域瞬态动力分析。根据S-N曲线法分析了导管架平台各主桩腿上管节点的疲劳寿命,均满足结构抗疲劳性能要求。文中冰激疲劳分析方法是解决渤海海域海洋工程结构冰激疲劳问题的有效方法,对海洋工程结构设计和评估具有重要意义。

The ratio of the marginal ice zone in Bohai Sea is increasing with global climate warming. The dy-namic condition in the marginal ice zone is complex, so the ice induced fatigue of a jacket platform in Bohai Sea attracts more attention. The ice induced fatigue of a jacket platform in Bohai Sea was analyzed by ANSYS software. According to the ice conditions in that sea area in winter, the rea-sonable ice induced fatigue working conditions were established first. The dynamic ice load time- history for each ice condition was determined by the dynamic ice load function. Then the transient dynamic analysis in time domain was advanced for the jacket platform. Based on the S-N curve, the fatigue lives of tubular joints in jacket platform legs were analyzed. The fatigue resistance re-quirement of the structure was satisfied. The analysis method of the ice induced fatigue was effec-tive to solve this kind of problem, and is significative for the design and evaluation for the offshore structure.