A simple image-based strain measurement method for measuring the strain fields in an R

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A simple image-based strain measurement method for measuring the strain fields in an RC-wall experiment

Author: Yuan-Sen Yang | Size: 1 MB | Format: PDF | Quality: Original preprint | Publisher: Wiley | Year: 22 March 2011 | pages: 17

A simple image-based method for measuring plane strain fields on the surface of specimens in earthquake
engineering experiments was developed. This method integrated camera calibration, stereo triangulation,
image metric rectification and image template matching techniques to develop a method that was costeffective, easy to apply and provided a satisfactory level of measurement accuracy. A zero-strain test
conducted using this method showed that the measurement accuracy achieved was 0.04 pixels. That is, the
relative displacement accuracy achieved was 0.005 mm and the strain accuracy was 0.001. This level of
accuracy was achieved using eight-mega-pixel digital cameras to measure a 17 cm×28 cm measurement
region. Cracks that were 0.012 mm wide were identified in the concrete by examining the displacement
fields calculated through the application of this image-based method in an RC-wall experiment

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