Diagnosis of Retrofit Fatigue Crack Re-Initiation and Growth in Steel-Girder Bridges For proactive Repair and Emergency Planning
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2014-07-01
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TRIS Online Accession Number:01544612
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Edition:Final Report December 2013 – July 2014
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Abstract:This report presents a vibration - based damage - detection methodology that is capable of effectively capturing crack growth near connections and crack re - initiation of retrofitted connections. The proposed damage detection algorithm was tested u sing numerical simulation and laboratory experimentation. Finite element models of the initial and retrofitted connections were developed to investigate the effect of crack growth before and after circular holes were implemented as stress relief measures. Laboratory experimentation on retrofitted specimens showed a tendency for the crack to branch in different directions in lieu of re - initiating through the holes. Throughout both the numerical and laboratory analyses, the results were able to successfully d etect damage by calculating a damage indicator, as specified within the algorithm. Although it was beyond the initial scope of the presented work, it was observed that the damage indicator also provides a relative quantification of the damage severity, i.e. ., as damage increased in the specimen, the magnitude of the damage indicator increased monotonically
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