Abstract
Abstract. Structural monitoring requires instruments which can provide high precision and accuracy, reliable measurements at good temporal resolution and rapid processing speeds. Long-term campaigns and flexible structures are regarded as two of the most challenging subjects in monitoring engineering structures. Long-term monitoring in civil engineering is generally considered to be labourintensive and financially expensive and it can take significant effort to arrange the necessary human resources, transportation and equipment maintenance. When dealing with flexible structure monitoring, it is of paramount importance that any monitoring equipment used is able to carry out rapid sampling. Low cost, automated, photogrammetric techniques therefore have the potential to become routinely viable for monitoring non-rigid structures. This research aims to provide a photogrammetric solution for long-term flexible structural monitoring purposes. The automated approach was achieved using low-cost imaging devices (mobile phones) to replace traditional image acquisition stations and substantially reduce the equipment costs. A self-programmed software package was developed to deal with the hardware-software integration and system operation. In order to evaluate the performance of this low-cost monitoring system, a shaking table experiment was undertaken. Different network configurations and target sizes were used to determine the best configuration. A large quantity of image data was captured by four DSLR cameras and four mobile phone cameras respectively. These image data were processed using photogrammetric techniques to calculate the final results for the system evaluation.
Highlights
With the development of engineering techniques, designs of constructions have become increasingly complex (Glisic et al, 2007)
Wide coverage, photogrammetry is likely to become one of the most important methods for flexible structural monitoring in engineering (Maas, 2006); combined with remote control techniques and the use of small volume and inexpensive imaging devices, a photogrammetric monitoring system can be placed in test fields for long-term monitoring purposes..*
Individual image station crashes occurred, the automatic recovery function was able to re-start the image capture with only minor interruptions. This automated recovery function can significantly improve the reliability for long-term monitoring purposes
Summary
With the development of engineering techniques, designs of constructions have become increasingly complex (Glisic et al, 2007). Have been widely applied for structural health monitoring purposes. These instruments can provide accurate measurements from millimetre to micrometre levels and most of these instruments are largely operated automatically (GonzálezAguilera et al, 2009; Lin et al, 2008; Psimoulis and Stiros, 2007). Photogrammetry is a non-contact measurement technique which utilises images to make accurate 3D measurements of complex objects (Luhmann, 2007). Wide coverage, photogrammetry is likely to become one of the most important methods for flexible structural monitoring in engineering (Maas, 2006); combined with remote control techniques and the use of small volume and inexpensive imaging devices, a photogrammetric monitoring system can be placed in test fields for long-term monitoring purposes..*
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