Photogrammetric Image Sequence Analysis for Deformation Measurement and Crack Detection Applied to a Shear Test on a Carbon Reinforced Concrete Member

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This publication presents a digital image correlation (DIC) based technique applied to a shear test on a carbon-reinforced concrete member. DIC methods are based on image sequences where the first image is recorded under zero-load without deformations while further images are taken from deformed stages. The image processing starts with the computation of subpixel-precise displacement vector fields using photogrammetric image matching algorithms. In our method, instead of computing strains, another approach is used to quantify deformations and to detect cracks. The matching points are triangulated into a triangular mesh. Then, a deformation model is used that includes a split of the triangle into two parts. The relative translation between these parts is computed and is considered as deformation vector. The detection of cracks is performed by a thresholding applied to the norm of the deformation vectors. Furthermore, the deformation vector is decomposed into the components parallel and perpendicular to the crack. The decomposition requires the knowledge of the crack normal, for which a possible estimation scheme is proposed. The presented method is suitable for brittle material, and it was applied to a monocular image sequence of a shear test of a carbon reinforced concrete member. The test specimen was made of high-strength concrete and was reinforced with a multilayer carbon reinforcement. The selected shear test was intended to analyze the shear behavior of a multi-span system with a distributed load.


Original languageEnglish
Title of host publicationBuilding for the Future
EditorsAlper Ilki, Derya Çavunt, Yavuz Selim Çavunt
PublisherSpringer Science and Business Media B.V.
Number of pages10
ISBN (print)9783031325106
Publication statusPublished - 2023

Publication series

Series Lecture notes in civil engineering
Volume350 LNCE


Titlefib Symposium 2023
SubtitleBuilding for the Future: Durable, Sustainable, Resilient
Duration5 - 7 June 2023
Degree of recognitionInternational event
LocationIstanbul Technical University Süleyman Demirel Cultural Center

External IDs

ORCID /0000-0001-8735-1345/work/142244670


ASJC Scopus subject areas


  • Carbon reinforced concrete (CRC), Crack detection, Deformation measurement, Digital Image Correlation (DIC), Image Sequence Analysis, Shear test