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

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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.
Publisher
TECHNO-PRESS
Issue Date
2007-07
Language
English
Article Type
Article; Proceedings Paper
Keywords

BRIDGE; GPS

Citation

SMART STRUCTURES AND SYSTEMS, v.3, no.3, pp.373 - 384

ISSN
1738-1584
URI
http://hdl.handle.net/10203/13837
Appears in Collection
CE-Journal Papers(저널논문)
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