進展期のRC梁に対するデジタル画像相関法を用いた曲げひび割れ発生の早期検出方法の提案

概要

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Reinforced concrete (RC) structures deteriorate because of the penetration of chloride ions into the cracks in concrete. Therefore, highly accurate detection of cracks is important. In this study, a pre-detection method for crack occurrence during RC beam bending is developed. The strain on a concrete surface is measured by a digital image correlation method. In addition, a method for detecting crack initiation is developed. In particular, RC beams used in experiments are set in the crack propagation stage based on the actual condition of existing structures. As a result, the location of crack occurrence is detected beforehand by a map of strain with 600μ or above. Hence, an effective pre-detection method for crack occurrence has been proposed for RC beams in the crack propagation stage.