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Data Analyses from Seismic Instrumentation Installed on the I-40 Bridge
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2021-10-31
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[PDF-4.94 MB]
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Alternative Title:Data Analyses from Seismic Instrumentation Installed on the I-40 Bridge: Determination of when Crack Occurred on the Hernando de Soto I-40 Bridge [Cover title]
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Edition:Final Report, 06/01/2021 to 10/31/2021
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Abstract:The Hernando De Soto I-40 Bridge spans over the Mississippi River connecting Tennessee and Arkansas. On May 11, 2021, this bridge was closed after detecting a fraction in one of the major 900-ft horizontal tension tie girders. Inspections conducted by officials from both the Tennessee and Arkansas departments of transportation revealed that the crack was there for many years. Despite much debate and many investigations, determining the time when the crack first formed is challenging. However, it is important to answer this question because, in bridges de-signs like the I-40 Bridge, a crack in or the failure of critical elements might result in the collapse of the whole structure. Therefore, determining the time when the crack first affects the performance of the bridge and reviewing the actions within this period can be helpful to update and modify the strategies and regulations for health monitoring these structures. The purpose of this research was to determine the time when the crack occurred using the ambient vibration data collected by the seismic instrumentation installed on the bridge. A network of sensors on the I-40 Bridge installed and maintained by the University of Memphis was used to determine when the cracked element first affected the behavior of the bridge. Vibration data recorded on the bridge in 2016, 2017, 2018, 2019, 2020, and 2021 were used in this study. We considered the frequency content of the bridge as one of the unique characteristics of the structures extractable from the recorded data that would change due to damage in the structure. A series of correlation tables were developed by processing and correcting data recorded on the bridge from 2016 to 2021. The results indicate that the tension tie girder crack was first detected in the 2018 data and continued to be developed in 2019 and 2020.
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