悬浮隧道锚索涡激疲劳损伤分析

为了评估水中悬浮隧道锚索涡激疲劳损伤，根据Hamilton原理，考虑附加质量对锚索动力特性的影响，应用模态叠加法，引入Blevins升力模型和Vengugopal阻尼模型，计算了升力系数和无量纲模态振幅；通过疲劳累积损伤理论和S-N疲劳曲线，计算了锚索涡激疲劳损伤.研究结果表明:低质量比（m*m*>10）时，附加质量系数的影响可以忽略；锚索长细比大于100时，锚索涡激振动表现为多模态谐振；利用本文提出的方法可以较为准确地计算锚索涡激疲劳损伤，文中算例计算结果与物理实验结果比较发现，计算误差在5%的范围内. 

Vortex-Induced Fatigue Damage Analysis of Submerged Floating Tunnel Cable

In order to assess the vortex-induced fatigue damage on cables of submerged floating tunnel, the Blevins lift model and Vengugopal drag model were introduced to calculate the lift coefficient and dimensionless amplitude by modal superposition method, taking into account the influence of the additional mass on the dynamic characteristics of the cable in Hamilton's principle. Then, the vortex-induced fatigue damage of the cable was calculated by Fatigue cumulative damage theory and S-N fatigue curve. The results show that when the mass ratio is low (m*m*>10), however, the impact can be ignored. When the slenderness ratio of the cable is above 100, the vortex-induced vibration is in a multimodal resonance state. The vortex-induced fatigue damage on the cable can be calculated accurately by the proposed method, and the calculated results in a case study has an error of less than 5% compared with the experimental results.