Structural Health Monitoring of Representative Cracks in the Manhattan Bridge
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2020-01-01
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Edition:Final Report, 09/01/2018 - 06/30/2019
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Abstract:The Manhattan Bridge in NYC is spanning the East River and connecting the island of Manhattan to Brooklyn. It is subjected to repeated dynamic loads, especially by the transit system trains with the average daily traffic of 1,000 trains/85,000 automobiles per day. As a result of repeated loads, multitudes of cracks have been developed in the floor beams, at bottom cords of trusses, and stringers. In addition, it is clear that the discontinuities at the rail splice details cause significant dynamic amplification as the trains pass over them. As a result, a portion of this bridge was selected for monitoring in order to quantify the dynamic amplification associated with the rail joints and to closely monitor the behavior of existing cracks. This was accomplished by implementing a two-phase approach. During the initial phase, an initial vibration survey of the accessible approach spans was conducted to identify locations of high and low dynamic amplification. During the second phase, a long-term fiber optic sensing system was deployed in the regions identified in the first phase to quantify dynamic amplification as well as monitor the behavior of a few representative cracks. This second monitoring phase was carried out over several months and the results were later analyzed and discussed to assess the condition of the bridge.
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