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.