INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Study on Calculation Method of Concrete Crack Width Based on MATLAB |
LIU Juanhong1,2,3, MENG Xiang1, DUAN Pinjia4, MA Kun1
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1 College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China 3 Key Laboratory of the Ministry of Metal Mining and Safety Education, University of Science and Technology Beijing, Beijing 100083, China 4 China National Offshore Oil and Gas Group Co., Ltd., Beijing 100028, China |
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Abstract This study was based on MATLAB software, presenting two kinds of calculating methods of concrete crack width; the crack morphology of the concrete sample with initial damage and the sample soaked in water for 7 days was extracted. After image grayscale, binarization, crack location and morphological treatment, the average width of the whole crack was calculated by using the relationship between the crack peri-meter and area. After the results are obtained, the data is exported. The results show that the method to calculate the average crack width by the relationship between the crack perimeter and the crack area is more accurate than the method to calculate the average crack width by traversing the minimum external rectangle in the direction of y axis. The crack width obtained by MATLAB image processing is basically the same as the crack width obtained by manual detection. The error rate is between 0% and 12%, and the efficiency and accuracy are higher. With the precision of ten million pixels, this study can realize the acquisition of the morphology and width data of concrete cracks with higher accuracy and higher efficiency, and improve the work efficiency of researchers in the research of concrete cracks. At the same time, this study can be used for crack measu-rement of bridges, high-rise buildings or concrete buildings with potential safety hazards. Intelligent and automatic equipment such as unmanned aerial vehicles, robots and robotic arms can be used for crack image acquisition, and the digital image processing technology can be used to realize crack identification, feature extraction and measurement.
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Published: 25 March 2022
Online: 2022-03-21
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Fund:Fundamental Research Funds for the Central Universities (FRF-BD-20-01B), the National Natural Science Foundation of China (51678049), the National Key Research and Development Program (2016YFC0600803). |
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