• Title/Summary/Keyword: civil

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Development and application of a vision-based displacement measurement system for structural health monitoring of civil structures

  • Lee, Jong Jae;Fukuda, Yoshio;Shinozuka, Masanobu;Cho, Soojin;Yun, Chung-Bang
    • Smart Structures and Systems
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    • v.3 no.3
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    • pp.373-384
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    • 2007

  • 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 visionbased 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.

  • https://doi.org/10.12989/sss.2007.3.3.373 인용