Structures Congress 2020
Vision-Based Quality Control Testing of Elastomeric Bridge Bearings
Publication: Structures Congress 2020
ABSTRACT
Elastomeric bridge bearings are widely used in bridges in order to allow deformations caused by temperature variations, traffic loading, shrinkage due to prestress or aging, and construction misalignments. However, manufacturing imperfections in these bearings (such as deviations in rubber layer thickness and non-parallel steel plates) affect their structural performance. Currently, quality control of these bearings involves destructive testing, which is costly and time consuming. This paper presents an alternative, vision-based approach for assessing the internal structure of elastomeric bridge bearings, which eliminates the need to destroy them. Three-dimensional digital image correlation (3D-DIC) is used to estimate the thickness of different rubber layers and any shim rotation or distortion based on deformation patterns on the surfaces of the bearings during compression testing. 3D-DIC provides full-field measurements of displacement and strain on the surface by tracking the distribution of grayscale values of pixel-based subsets in the sequence of stereo images. The presented approach enables engineers to efficiently evaluate bearings for quality control purposes.
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ACKNOWLEDGEMENT
The authors gratefully acknowledge the support of this research by the Ministry of Transportation of Ontario (MTO) through the Highway Infrastructure Innovation Funding Program (HIIFP). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsor.
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Published In
Structures Congress 2020
Pages: 651 - 664
Editor: James Gregory Soules, CB&I Storage Tank Solutions
ISBN (Online): 978-0-7844-8289-6
Copyright
© 2020 American Society of Civil Engineers.
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Published online: Apr 2, 2020
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