海洋平台主结构节点裂纹修复分析研究(英文)

Research of Repair Major Joint Cracks of Offshore Platforms by Finite Element

对于结构老化的海洋平台,疲劳裂纹是破坏其结构完整的主要威胁。文章分析了平台结构产生节点裂纹的原因。探讨了海洋平台主结构节点的修复。通过有限元的分析指出,裂纹发生的区域也是应力集中的区域。基于对解决方案各应力状态的比较分析,最终确定了节点修复的方法,可利用钢结构加以维修加固,不需分散主结构结点的组成,克服传统修复方法的缺点。结构修复后主结构结点的应力减小了8.376ksi。

Fatigue cracks are major threats to the structural integrity of aging offshore platforms. The results of the investigation of occurrence of joint cracks are analysed and attention is drawn to the reconstruction of major joint in the structure of offshore platform. The results of the finite elements analysis （FEA） point out the pronounced stress concentration in the zones of crack occurrence. The design solution for offshore platform reconstruction is chosen based on the comparative analysis of stress states of alternative solutions. The adopted solution enabled the repair and reconstruction in field conditions, without previously dismantling components of major joint structure. Moreover, the regular maintenance procedure was not impeded. After the reconstruction the stress of major joint decreased 8.376 ksi.