Connecticut Permanent Long-Term Bridge Monitoring Network Volume 2: Monitoring of Curved Post-Tensioned Concrete Box-Girder Bridge - I-384 WB Over I-84 in East Hartford (Bridge No. 5686).

摘要

This report describes the instrumentation and data acquisition for a three-span continuous, curved post-tensioned box-girder bridge in Connecticut. The computer-based remote monitoring system was developed to collect information on the deformations, accelerations and temperature distributions to evaluate the long-term behavior and performance of the bridge. The monitoring system was installed in 1999, as the first system in a long-term research project to evaluate a variety of bridges in Connecticut. The data collected over multi-year periods from normal vehicular traffic has been used to learn about long-term performance of this bridge, resulting in a series of papers. The initial study developed an approach using histograms to better define natural frequencies from the extensive field data. The second study explored the influence of temperature distributions on the overall behavior of the bridge, including evaluation of the cause of cracking in both the box girders and the interior column supports. The third study looked at the influence of temperature variations on the baseline data, needed to remove the effect of temperature variations from data generated for long-term structural health monitoring. The final study has used the information previously developed for both this bridge and others to establish a baseline for long-term structural health monitoring and performance evaluation to determine if changes in the structural integrity are developing over time. The final study described in this report identifies and quantifies different data qualification measures needed for the structural health monitoring of this bridge.