为了对运营期斜拉桥安全性进行评估,提出了评估斜拉索安全性的方法.考虑Daniels效应和断丝概率提出斜拉索强度模型与基于斜拉索运营期安全系数的大跨度斜拉桥可靠度评估方法.作为模型的应用验证,分析了宁波招宝山斜拉桥最长边索,即第25号索在不同检测期的安全性,并调查了不同的参数对安全概率的影响.分析结果表明:斜拉索Daniels效应不可忽略;运营期斜拉索的退化可以通过线性增长的索内断丝率来模拟;考虑斜拉桥拉索退化过程的随机性评估运营期斜拉桥拉索安全水平的方法是有效的. In order to evaluate the safety of cable stayed bridge during operation, a method of assessing the safety of stay cables is proposed.It is put forward that considering the Daniels effect and the breaking probability, the model of stay cable strength and the long-span cable-stayed cable As an application verification of the model, the security of the longest tributary of Cable-stayed Bridge in Zhaobaoshan of Ningbo, that is, the No. 25 cable at different testing periods, is analyzed and the influence of different parameters on the safety probability is investigated. The results show that the Daniels effect of stay cables can not be neglected. The degradation of stay cables during operation can be simulated by the linear increase of cable breakage rate. The randomness of cable stay degradation of cable stayed bridge is evaluated. The method of safety level is effective.