Abstract
To reduce the period of calculation has been a key when the digital image correlation method is applied to the reinforced concrete (RC) structures having a large size. This paper proposed the algorism for reducing the time of calculation at the digital image correlation method, which is one of the image analysis methods to obtain the deformation of targets. The proposed algorism reduced the time for `coarse search' by using the shape functions. According to the proposed method, the strain generated at the surface of cementitious materials was measured. The specimen was deformed through drying and being loaded. The employed time of the analysis using the proposed `coarse search' algorism reduced significantly the time compared with the full-checked type `coarse search' algorism. The paper concluded that the proposed analysis evaluated the crack propagation of cementitious composite materials, even being difficult to capture visually.
