Multiscale Condition and Structural Analysis of Steel Bridge Infrastructure
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2018-02-01
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Abstract:The deteriorating state of the nation's highway infrastructure is well known. Yet, the data that exists or can be obtained regarding the condition and behavior of this infrastructure presently exceeds the profession's ability to make efficient use of said data. In this work, the depth and breadth of three data types (NBI data, owner inspection report data, and finite element analysis data) are integrated to identify structural characteristics leading to above- or below-average performance, after accounting for important differences in climate, use, etc. Each of these data types has been used for various applications, but this is the first known study that has systematically evaluated the inter-relationships between these data types. The piloted methodology is found to be successful. Specifically, the database that was built and corresponding analysis process is successful at identifying outliers that perform significantly better or worse than their counterparts. Furthermore, from the subset of these outliers that are selected for modeling, clear differences in the structural behavior of the good and inferior bridges were observed. Namely, the maximum stresses in the inferior bridge are the result of stress concentrations at connections, which includes the use of a bent plate to connect the transverse stiffener to cross-frame elements. A second key finding is that most of the inferior bridges are not affected by structural issues, but rather are suffering from corrosion problems. This highlights the continued need for better corrosion mitigation strategies both in initial design and in the maintenance of highway bridges.
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