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Estimation of Local Strain Distribution of Shear-Compressive Failure Type Beam Using Digital Image Processing Technology

화상계측기법에 의한 전단압축파괴형 보의 국부변형률분포 추정

  • Kwon, Yong-Gil (Institute of Construction Technology, Chungbuk National University) ;
  • Han, Sang-Hoon (Dept. of Civil Engineering, Chungbuk National University) ;
  • Hong, Ki-Nam (Dept. of Civil Engineering, Chungbuk National University)
  • Published : 2009.04.30

Abstract

The failure behavior of RC structure was exceedingly affected by the size and the local strain distribution of the failure zone due to the strain localization behavior on the tension softening materials. However, it is very difficult to quantify and assess the local strain occurring in the failure zone by the conventional test method. In this study, image processing technology, which is available to measure the strain up to the complete failure of RC structures, was used to estimate the local strain distribution and the size of failure zone. In order to verify the reliability and validity for the image processing technology, the strain transition acquired by the image processing technology was compared with strain values measured by the concrete gauge on the uniaxial compressive specimens. Based on the verification of image processing technology for the uniaxial compressive specimens, the size and the local strain distribution of the failure zone of deep beam was measured using the image processing technology. With the results of test, the principal tensile/compressive strain contours were drawn. Using the strain contours, the size of the failure zone and the local strain distribution on the failure of the deep beam was evaluated. The results of strain contour showed that image processing technology is available to assess the failure behavior of deep beam and obtain the local strain values on the domain of the post-peak failure comparatively.

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