| Through the long-term monitoring system on Wuhu Yangtze Bridge, the safety has been enhanced by studying its application of expected function with two ways, that is, long-term real time monitoring and regular test of technical state. This paper mainly deals with the fatigue damage and life prediction of Wuhu Bridge. The software which is a subsystem of the whole evaluating system has been compiled. It has a function of calculating damage over 32 positions in real time and assessing the safety of the bridge. In fatigue analysis, the fatigue strain histories from the acquisition system have been converted into stress spectrums. Then through each analytic module, equivalent stress amplitude, maximum amplitude, real damage and the degree of damage and so on have been obtained. These results which are stored in a database continually can be observed from the information display system.Comparing the stress monitoring results of all the test points, the key parts which control the fatigue of the whole bridge have been confirmed. Then with the damage gotten from the fatigue evaluating system, the life of the bridge can be predicted regularly. In addition to the outcome above, computer simulation has also been used for fatigue analysis. In analysis, solid models of three typical joints have been made by using ANSYS which is a powerful FE software. The stress spectrums acquired from real monitoring are supplied on the models to analyze, then putthe structural analysis results into FE-SAFE, a fatigue software, which can predict the position of failure and the life conditions of each part, and this way can we get an evaluation on local part in detail.This paper provides a practical and valid solution for fatigue damage evaluation and life prediction in long-term and real time monitoring system. Also, it can be applied in other bridges and promote the further development of health monitoring system on bridge. |
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