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首页> 美国政府科技报告 >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 No. 5868).
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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 No. 5868).

机译：康涅狄格永久长期桥梁监测网络第4卷：监测弯曲钢箱梁 - 复合桥 - I-84 EB天桥到哈特福德的I-91 NB（桥号5868）。

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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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