United States Department of Transportation
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Connecticut permanent long-term bridge monitoring network, volume 4 : monitoring of curved steel box-girder composite bridge - I-84 EB Flyover to I-91 NB in Hartford (bridge #5868).
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2014-08-01
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[PDF-1007.15 KB]
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Abstract:This report describes the instrumentation and data acquisition for a continuous curved steel box-girder composite bridge in
Connecticut. The computer-based remote monitoring system was installed in 2001, with accelerometers, tilt meters and
temperature sensors. The bridge is part of a network of bridges in a long-term research project to evaluate the performance of a
variety of bridges in Connecticut. Data has been collected over a multi-year period using normal vehicular traffic. A series of
papers has been generated to explore the behavior of this bridge and to provide information to the Department of Transportation.
The first study involved the development, implementation and evaluation of the initial data obtained from the monitoring system.
This included a study of the large temperature gradients due to both annual climate changes and the position of the sun during the
day. The goal was to explain the cause of torsion cracking in the tall slender concrete interior column supports. The second study
used data collected over a multi-year period to develop benchmark parameters to use for structural health monitoring. Methods
reviewed included natural frequency based methods, the modal assurance criterion, the signature assurance criterion, sensitivity
coefficients of natural frequencies, and tilt meter data. The goal was to use ambient field monitoring data to detect changes in the
structural integrity of the bridge. In the next study the improvement in bandwidth of the upgraded system is identified. The final
study described in this report identifies and quantifies different data qualification measures needed for the structural health
monitoring of this bridge.
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