A Process Control System for the John F. Kennedy Memorial Bridge
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2011-05-10
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TRIS Online Accession Number:01342005
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Abstract:The John F. Kennedy Memorial Bridge is a cantilever through truss that carries Interstate 65 across the Ohio River between Louisville, KY and Jeffersonville, IN. During a routine inspection in 2006, one of the anchor bolts on its northwest bearing was found fractured, leading to concerns over performance of the uplifting bearing. A retrofit system was then installed consisting of a threaded rod and clamp-down keepers. Additionally, continuous remote monitoring was implemented to provide thorough characterization of the retrofit performance in the long term, so as to support managerial decisions related to inspection and maintenance planning. This system has continuously monitored the condition of the repaired bearing assembly, and was able to detect an abrupt failure in one of the components of the retrofit in the fall of 2008. This failure resulted in immediate and obvious changes to the stream of data collected by the system. However, there is a need for techniques to monitor long-term trends in condition, which may be subtle and not immediately obvious upon reviewing the raw data. In this study, the authors developed and implemented an automatic system to process and analyze the data collected. The objectives are to: (1) Allow engineers to make inferences about the structural integrity, i.e., the condition, of the elements, and how they evolve over time in response to normal operating factors such as weather, traffic loading, etc.; and (2) Detect external events that may have either a transitory or a permanent effect on the structural integrity of the bridge elements and how they evolve over time. In both cases the goal is to support decisions to inspect the components when structural deficiencies are either anticipated due to regular deterioration or directly related to external events. During the progress of this project, the system has monitored and controlled the performance of the John F. Kennedy Memorial Bridge using available data dating from summer 2008, and has demonstrated its capability to achieve the objectives listed above. However, due to unexpected breaks of the instrumentation process in early 2009 and after mid-2010, no complete data were available anymore to further testify to and improve updated features of the system. This is beyond the authors' control and they have started to implement the same set of techniques and framework in the system on other infrastructure for continued research.
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