Techno Press
Techno Press

Smart Structures and Systems   Volume 3, Number 3, July 2007, pages 373-384
DOI: http://dx.doi.org/10.12989/sss.2007.3.3.373
 
Development and application of a vision-based displacement measurement system for structural health monitoring of civil structures
Jong Jae Lee, Yoshio Fukuda, Masanobu Shinozuka, Soojin Cho and Chung-Bang Yun

 
Abstract     [Full Text]
    For structural health monitoring (SHM) of civil infrastructures, displacement is a good descriptor of the structural behavior under all the potential disturbances. However, it is not easy to measure displacement of civil infrastructures, since the conventional sensors need a reference point, and inaccessibility to the reference point is sometimes caused by the geographic conditions, such as a highway or river under a bridge, which makes installation of measuring devices time-consuming and costly, if not impossible. To resolve this issue, a vision-based real-time displacement measurement system using digital image processing techniques is developed. The effectiveness of the proposed system was verified by comparing the load carrying capacities of a steel-plate girder bridge obtained from the conventional sensor and the present system. Further, to simultaneously measure multiple points, a synchronized vision-based system is developed using master/slave system with wireless data communication. For the purpose of verification, the measured displacement by a synchronized vision-based system was compared with the data measured by conventional contact-type sensors, linear variable differential transformers (LVDT) from a laboratory test.
 
Key Words
    displacement measurement; vision-based system; digital image processing; load carrying capacity; time synchronization; multi-point measurement.
 
Address
Jong Jae Lee; Department of Civil & Environmental Engineering, Korea Advanced Institute of Science and Technology, Guseong-dong, Yuseong-gu, Daejeon, Korea
Yoshio Fukuda and Masanobu Shinozuka; Department of Civil & Environmental Engineering, University of California Irvine, Irvine, CA, 92697, USA
Soojin Cho and Chung-Bang Yun; Department of Civil & Environmental Engineering, Korea Advanced Institute of Science and Technology, Guseong-dong, Yuseong-gu, Daejeon, Korea
 

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