Noncontact Measurement of Bridge Load Response Using He–Ne Modulated Lasers
Publication: Journal of Bridge Engineering
Volume 24, Issue 11
Abstract
Structural deformation under known loads is required for assessment and model calibration. In addition, deformations need to be measured under transient as well as intrinsic loads. These loads have significantly different application durations requiring significantly different sampling rates. Measurement of deformations and translations with traditional sensors is challenging because it requires sensor mounting to a fixed reference. In the case of monitoring structures during construction, limited access and schedule constraints necessitate placement of the monitoring equipment outside the active construction zone. This article presents an implementation as well as proof of concept of a noncontact technology for obtaining accurate measurements with minimum impact to the structure and construction activities. Indoor and outdoor calibration showed that the deviation of measurements made at an 81-m (266-ft) range was about ±7% of the linear displacement potentiometer sensors. The maximum deviation of deflection measurements made during load testing of a steel girder bridge was 8.3% of the linear displacement potentiometer sensors. The measurements included three-dimensional (3D) displacements at each location, a significant advancement over traditional technologies.
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Acknowledgments
The authors would like to acknowledge and thank the Michigan Department of Transportation (MDOT) and Western Michigan University (WMU) for funding part of this research. The assistance of graduate students Alp Servi, Abdul Wahed, Cem Mansiz, Duy Nguyen, and Vinod Kumar Vijayan during laboratory evaluation of the technology, load testing of the bridge, and analysis of the data is greatly appreciated. The assistance of Hannah Abell and Amanda Luykx, high school students at the Kalamazoo Area Math and Science Center (KAMSC), and Yasan Abubaker, an undergraduate intern from Jordan, is greatly appreciated. The authors would like to thank Dr. Emin Aktan and Dr. Franklin Moon from Drexel University for the opportunity to use the laser tracker in conjunction with other technologies at the New Jersey bridge site and for sharing the potentiometer data.
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Information
Published In
Journal of Bridge Engineering
Volume 24 • Issue 11 • November 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Apr 30, 2018
Accepted: Apr 17, 2019
Published online: Aug 29, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 29, 2020
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