基于WIM数据的上海长江大桥钢箱梁的寿命评估

摘要

Evaluation of the box girder details of Shanghai Yangtze river can provide the basis for the bridge ’ s maintenance and repairment .The research result of “Fatigue stress spectrum study of the steel box girder of Shanghai Yangtze River Bridge ,based on the analysis of WIM data” was used to get all the details of the stress spectrum of steel box girder .Then according to BS 5400 the tenth part ,confirming S-N curve which can reflect the details quality of fatigue .Finally ,estimating the steel box girder’s life with the combination of the Miner fatigue cumulative damage rule .According to the result ,we can know that during the current oper-ating process ,the box girder details have small stress amplitude ,high cycles and small damage magnitude . These details will not bring about fatigue damage .During the current operation ,the structure will keep high safety performance and reliability .Determine the damage point and the size of the damage value is unique in this article .%通过对上海长江大桥细节寿命的估算为大桥的维护和修复提供依据。基于论文“基于WIM数据的上海长江大桥钢箱梁应力谱研究”的研究结果，得到钢箱梁各细节的应力谱，同时参考英国桥梁规范BS 5400第十部分，确定了能够体现细节疲劳性能的 S-N曲线，并结合M iner疲劳累积损伤准则，对大桥钢箱梁细节寿命进行评估。研究结果表明，在现行日常运营过程中，钢箱梁各细节应力幅值较小，循环次数多，损伤量级很小，故细节不会发生疲劳破坏，即结构在现行运营期间保持了很高的安全性和可靠度。