| 摘要(英) |
The factors of measuring cracks in concrete include crack widths, crack depth, crack spacing, crack density etc., yet this thesis will focus on developing an uncomplicated and understandable method to gauge the cracks block on crack spacing and crack density. According to the similarity of polygons of irregular map cracks, the purpose of the method is exploring the relations between the quantity of intersection point and percentage of the crack-crossed cells of the lattice-arranged lines and crack spacing and crack density by counting the numbers of complete cells instead of the current measurement - counting the numbers of intersection point. Under the hypotheses that crack widths could be passed over, cracks spread averagely, the lines are infinite and crack-based is square, inferring the product of crack spacing and crack density is π/2 by the geometry theory, fractal theory and scale effect are not considered in the study.
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