Image-based Bolt-loosening Detection Technique of Bolt Joint in Steel Bridges
نویسندگان
چکیده
This paper presents a novel bolt-loosening detection technique using image information of bolted joints in steel bridges. Firstly, existing bolt-loosening detection techniques are reviewed and their benefits and limitations are analyzed. Secondly, a bolt-loosening detection algorithm using image processing techniques is newly proposed for bolted joints in steel bridges. It consists of 3 steps: (1) taking a picture for a bolt joint, (2) segmenting the image to identify a splice plate and each nut, and (3) identifying rotation angle of each nut and detecting boltloosening. As a key technique, the Hough transform is used to identify rotation angles of nuts, and then boltloosening is detected by comparing the angles before and after bolt-loosening. Finally, the applicability of the proposed technique is evaluated by experimental tests with bolt-loosening scenarios. A bolted joint model which consists of a splice plate and 8 sets of bolts and nuts with 2×4 array is used for the tests.
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