Journal article
Surface Rotation Correction and Strain Precision of Wide-Angle 2D DIC for Field Use
Department of Civil Engineering, Technical University of Denmark1
Design and Processes, Department of Civil Engineering, Technical University of Denmark2
Structures and Safety, Department of Civil Engineering, Technical University of Denmark3
Villum Center for Advanced Structural and Material Testing, Centers, Technical University of Denmark4
The paper describes how 2D Digital Image Correlation is used on underneath surfaces of concrete bridges with wide-angle lens camera during load testing, and how it has potential as a stop criterion in proof loadings. A method is proposed for correction of out-of-plane deflection including rotation of the surface.
The method is applied to laboratory tests, using well defined circular speckle patterns, as well as to a field tested bridge (on raw concrete). The proposed correction corresponds to the level of pseudo strain, but is very sensitive to precise surface deflection measurements. In the laboratory tests, a strain precision of the wide-angle lens camera is compared to a regular lens camera.
The parametric study concludes that a Pattern Pixel Relation, in the interval from 4 to 9 pixels per pattern circle diameter, provides the optimal precision regardless of the camera type. The field tested bridge has less good precision compared to most parameter combinations of the laboratory tests.
Nevertheless, the field strain precision has potential for improvement based on learnings from the laboratory tests.
Language: | English |
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Publisher: | American Society of Civil Engineers |
Year: | 2019 |
ISSN: | 19435592 and 10840702 |
Types: | Journal article |
DOI: | 10.1061/(ASCE)BE.1943-5592.0001358 |
ORCIDs: | Halding, Philip Skov , Christensen, Christian O. and Schmidt, Jacob W. |