United States Department of Transportation
i
Hernando Desoto I-40 Bridge Seismic Instrumentation Upgrade
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2018-05-05
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[PDF-8.55 MB]
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Abstract:Over the past several years, The Hernando Desoto Bridge carrying I-40 across the Mississippi river at Memphis has been the scene of an intensive strong motion monitoring project, involving the installation of numerous traditional and several non-traditional forms of instrumentation designed to characterize the response of the structure to shaking from seismic and induced sources. This bridge has been retrofitted to withstand a magnitude (mb) 7 event at 65 km distance from the site at a depth of 20 km. The goal of the retrofit was to have this bridge fully operational following the maximum probable earthquake (2500-year return period). In 2001, we had installed 114 sensors on the I-40 Hernando Desoto Mississippi River Bridge in Memphis, Tennessee to fully characterize the response of the bridge to strong ground motion. These original sensors had internal bearings that wore over time especially in the high vibrational environment of the I-40 bridge. Additionally, upgrade of the data acquisition systems in 2012 allowed real-time continuous data transfer to a data concentrator node at the AutoZone Headquarters building in downtown Memphis except that bandwidth was limited by the telemetry. The objective of this project was to replace the existing sensors with a higher quality, industry standard accelerometers. High quality static-based sensors were also purchased and installed. Additional sensors were added to monitor the ground motion at the foundation level located approximately 95 ft below the bottom of the existing riverbed and about 130 ft below the high-water level.
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