Surface Rotation Correction and Strain Precision of Wide-Angle 2D DIC for Field Use

Philip Skov Halding*, Christian O. Christensen, Jacob W. Schmidt

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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.
Original languageEnglish
Article number04019008
JournalJournal of Bridge Engineering
Issue number4
Number of pages12
Publication statusPublished - 2019

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