ABSTRACT
During the construction and operation of the bridge, structural damage may be caused due to the influence of load and environmental factors, which may lead to safety problems. This paper proposes a new bridge displacement monitoring method based on photographic image. Firstly, the image feature module and marking module are introduced, and two different marking modules are proposed, namely one target circle and two target circles. In order to select the marking module with better stability and accuracy, experiments were carried out under different light intensities, that is, static monitoring was carried out at different time points. The stability is evaluated by the scale factor and the accuracy of the abscissa and ordinate of the target circle is evaluated. The test results show that the performance of the marking modules of the two target circles is better in terms of stability and accuracy. The new monitoring method studied in this paper can accurately monitor the displacement of bridge structure in real time. It has the advantages of high efficiency, low cost and convenient installation. It can play an ideal performance during bridge construction, operation and demolition.
