Fatigue damage estimation of the tendons was made using fracture mechanics approach, establishing the fracture crack growth rate model and limitstate equations for failure modes.
疲劳寿命的计算采用断裂力学方法，建立疲劳裂纹扩展模型和失效模式的极限状态方程。
2
Because of the interaction of external loads and corrosion, the reliability index decays very quickly. And fatiguelimit-state will take control of the safety of the cables and Bridges.