Abstract
In this paper, we propose a vision-based rotational angle measurement system for large-scale civil structures. Despite the fact that during the last decade several rotation angle measurement systems were introduced, they however often required complex and expensive equipment. Therefore, alternative effective solutions with high resolution are in great demand. The proposed system consists of commercial PCs, commercial camcorders, low-cost frame grabbers, and a wireless LAN router. The calculation of rotation angle is obtained by using image processing techniques with pre-measured calibration parameters. Several laboratory tests were conducted to verify the performance of the proposed system. Compared with the commercial rotation angle measurement, the results of the system showed very good agreement with an error of less than 1.0% in all test cases. Furthermore, several tests were conducted on the five-story modal testing tower with a hybrid mass damper to experimentally verify the feasibility of the proposed system.
Highlights
In civil engineering, damage in a structure generally causes a local increase in flexibility, which depends on the extent of the damage
Rotation angle measurement has been successfully applied in many applications such as displacement measurement of high-rise buildings [2], examining deformations of bridge spans [3], ground movement monitoring [4,5], automobiles [6], etc
The objective of this study is to develop a single-point rotational angle measurement system for large-scale civil structures using a multi-point vision-based system with high resolutions
Summary
Damage in a structure generally causes a local increase in flexibility, which depends on the extent of the damage. Rotation angle measurement has been successfully applied in many applications such as displacement measurement of high-rise buildings [2], examining deformations of bridge spans [3], ground movement monitoring [4,5], automobiles [6], etc. Rotation angle measurement systems are widely used nowadays to monitor deformations of large-scale civil structures such as long-span bridges, tunnels, dams, high-rise buildings, etc. Jeon et al [3] introduced in 2011 a paired structured light for displacement measurement of structures. This system could simultaneously obtain the displacement and rotation of the measurement point. The system had a complicated setup and required a transformation matrix to obtain the final results
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