基于多尺度有限元模型的海上变电站管轴式吊耳强度分析

Strength Analysis of Lifting Trunnion for Offshore Substations Based on Multiple-Scale Finite Element Model

对如东海域某大型海上变电站导管架结构的管轴式吊耳,采用SACS软件建立其多尺度有限元模型,探讨吊耳类型和加筋板对其强度的影响,并将计算结果与ANSYS局部有限元模型的计算结果进行对比分析,探究多尺度有限元方法与局部有限元方法计算结果的差异。结果表明两侧斜向撑杆的设置对整个吊耳的强度变化影响不大,筋板对应力集中现象有一定的改善,且局部有限元方法的计算结果相对更为保守。

For a large offshore substation located in Rudong,China,a multiple-scale finite element model of the lifting trunnion of the jacket is built by SACS software.A series of numerical analyses are conducted to investigate its strength behavior under different trunnion types and the use of stiffened plates.A local finite element model of the lifting trunnion is also built by ANSYS for comparison.The difference in the calculation results between the multiple-scale finite element model and the local finite element model is explored.The results show that the setting of diagonal braces is of little effect on the strength of the trunnion,but the stress concentrationis obviously improved by stiffened plates.In addition,the results of the local finite element method are relatively more conservative.