Application of 2D Digital Image Correlation Three Point Flexure Test of Reinforced Concrete Beam

2016-09-21
Albostan, Utku
Kurç, Özgür
Digital image correlation (DIC) method has been used in many disciplines to measure displacement and strain without any contact to the specimen. Moreover, it is usually a cheaper method when compared with other measurement techniques. In this technique, a single or stereo digital cameras are needed for the 2D and 3D measurements, respectively. Images used for correlation are generally acquired from videos shot by high speed cameras. Accordingly, their resolutions and measurement accuracies are not sufficient for the small displacement on larger structures. In this study, a simply supported reinforced concrete beam was tested by applying a point force at the mid-span. One side surface of the beam was speckled randomly and 2D measurement method was employed. Images of the speckled surface were captured by a 24 MP DSLR camera as photos with a specified time interval instead of shooting video. Then, image averaging process was performed to minimize the noise on them before the correlation process. Classical displacement measurement instruments, LVDTs, were also located on the beam to verify the method's findings. Firstly, the beam was forced in its elastic limit, then it was loaded until it failed. Displacement measurements were compared to each other for both cases. In the permanent deformation test, the cracking patterns were also observed by utilizing DIC method. Finally, for this study, the performance of the 2D DIC measurement technique for small deformations was verified.

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Citation Formats
U. Albostan and Ö. Kurç, “Application of 2D Digital Image Correlation Three Point Flexure Test of Reinforced Concrete Beam,” presented at the Application of 2D Digital Image Correlation: Three Point Flexure Test of Reinforced Concrete Beam,( 21 - 23 Eylül 2016), 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/88042.