Deflection Monitoring in Beam Using Digital Photogrammetry
Abstract
This paper demonstrates preliminary step to check the potential of digital photogrammetry for monitoring the deflection in bridge. Deflection is identified as the primary structural stiffness parameter, and large deflection beyond the permissible limit may show either an extraordinary burden or a lack in the design. Deflection monitoring gives significant data about dynamic characteristics of structure and, henceforth, changes in primary condition. Deflection monitoring is one different technique that will become the indication of bridge feasibleness since this technique is simple, effective, and may be used for multi-temporal applications. The target of this study is to monitor the deflection of a simply supported beam of the span of 1.2 m through digital photogrammetry and dial gauge. The comparison of results with respect to theoretical calculation leads to indicate that the system provides valuable data concerning deflection up to mm accuracy and offers a lot of correct results in comparison with a dial gauge. Therefore, a similar technique can be applied within the bridge structural health monitoring (SHM) system to monitor live deflection in millimeter accuracy.