三峡库区变动回水区趸船系留设施疲劳性能评估

Fatigue performance evaluation of pontoon mooring facilities in fluctuating backwater area of Three Gorges Reservoir

针对三峡库区变动回水区重庆段内某一典型码头工程项目,分别计算得到在4种随机过程条件下,其趸船系留设施中各缆绳、锚链在疲劳寿命期内的日均系缆、系锚应力-历时关系。根据Miner线性累积损伤理论,结合各缆绳、锚链材料的T-N曲线,计算得到各缆绳、锚链的总疲劳损伤,并预测各构件的疲劳寿命年限。本文中所用到的疲劳分析理论及计算过程不仅可以为三峡库区变动回水区趸船系留设施疲劳安全整改提供一定程度上的技术支撑,也可为类似工程项目的疲劳设计与评估提供有价值的参考依据。

Based on a wharf project in the fluctuating backwater area of Three Gorges Reservoir in Chongqing, we calculate each mooring line and anchor chain＇s average daily stress-duration curve within the scope of the whole fatigue life period under the four kinds of random process. Based on the Miner linear cumulative damage law, and combining with the T-N curve of each mooring rope and anchor chain, we get the cumulative fatigue damage of every one, and predict the fatigue life. The fatigue analysis method can not only provide a technical support for the safety hidden dangers＇ rectification of pontoon mooring facilities in the fluctuating backwater area of Three Gorges Reservoir, but also provide valuable reference for the fatigue design and evaluation of similar projects.