【摘要】 基于南海某半潜式平台关键热点——结构中应力集中较高区域的实测数据和高精度仿真模型两个维度，获取数值计算和实测应力数据，结合测点对应的应力响应幅值算子(Response Amplitude Operator, RAO)和测点之间的过渡响应幅值算子(Transition Response Amplitude Operator, TRAO)做进一步研究，建立TRAO修正因子和应力孪生修正系数，进而实现对结构热点区域更精确的数字孪生，为计算结构热点的疲劳损伤奠定基础。结果表明，计算结果与实测值的相对误差约5%,孪生应力谱与实测应力谱吻合较好，在峰值部分与实测数据误差为14%,可在结构安全评估中起到一定的指导作用，也进一步表明数字孪生技术在海上结构安全评估中具有较好的应用潜力。更多还原

【Abstract】 Based on the measured data and high-precision simulation model of the key hotspots-areas of high stress concentration within the structure-of a semi-submersible platform in the South China Sea, the numerical calculated and measured stress data are obtained. Further research is conducted combined with the stress Response Amplitude Operator(RAO) corresponding to the measurement points and the Transition Response Amplitude Operator(TRAO) between the measurement points, to determine the TRAO correction factor and the stress twinning correction coefficient, which in turn will achieve a more accurate digital hotspot area of structural twinning, which lays the foundation for calculating the fatigue damage of the structural hotspots. The results show that the relative error between the calculated results and the measured values is about 5%, the twinned stress spectrum agrees well with the measured stress spectrum, and the error between the peak part and the measured data is 14%, which can provide useful guidance in structural safety assessments. This further demonstrates that the digital twinning technology is of significant potential for application in the safety assessment of offshore structures.更多还原