Image-based analysis of the flexural behavior of reinforced concrete beams

Abstract

In this study, the crack width and deflection relationship developed for the serviceability evaluation of reinforced concrete (RC) beams is applied to the experimental results of RC beams to evaluate its applicability and limitations. In addition, digital image correlation (DIC) method and three-dimensional (3D) scanning technology are applied to the deformation measurement of RC beam experiments, and the results of each measurement were compared. This study aims to provide a basis for expanding the applicability of reliable digital image-based measurement techniques in the serviceability evaluation of RC structures. The DIC technique was used to accurately measure crack propagation and deflection in RC beams, and the results were compared with those obtained by conventional measurement methods such as linear variable differential transducer (LVDT) and crack width measurement equipment. In addition, 3D models of the specimens were created using 3D scanning and compared with the deformation data measured by DIC to verify their accuracy. The experimental results showed that the DIC and 3D scanning had high accuracy within 4.23% and 2.94%, respectively, compared to the displacement data measured by LVDT, and the proposed algorithm was able to evaluate the correlation between crack width and deflection.

Graphical abstract

Keywords

RC beam / flexural behavior / deformation / DIC / 3D scanning / experimental measurement

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