Displacement and Strain Field Measurement in Steel and RC Beams Using Particle Image Velocimetry

Particle image velocimetry (PIV) to evaluate fresh and hardened state properties of self compacting fiber-reinforced cementitious composites (SC-FRCCs)

“…A modified approach was used to implement PIV in geotechnical testing by White et al According to their investigations, the modified PIV technique offers an order-of-magnitude increase in accuracy, precision, and measurement array size compared with previous image-based methods of displacement measurement [20]. The PIV analysis procedure can be summarized as follows [20,25,30]: (i) subdivide the first image into subsets (patches) and select a test patch; (ii) evaluate the cross-correlation of the selected test patch, and search the patch using the fast-Fourier transform (FFT); (iii) normalize by cross-correlation of the search patch with the mask function (the most likely displacement is the peak of the function); (iv) find the subpixel location of the correlation peak using bicubic interpolation; (v) repeat the procedure for other test patches of the first image; (vi) repeat for all images in the series, and calculate the displacement vectors; and (vii) calculate the strain tensor using the obtained displacement field.…”

“…It should be noted that application of the PIV technique in structural tests has been comprehensively discussed in [26][27][28][29][30].…”

“…This technique is used to determine instantaneous fields of the vector velocity by measuring the displacements of numerous fine particles that accurately follow the motion of the fluid [17]. Nowadays, PIV has been used in the field of concrete/ composites also, in order to measure displacement and strain fields [26][27][28][29] and monitoring fracture process zones (FPZs) and cracks [12,30]. Pioneering research done on the subject reveals the potential of this technique for precise and easy measuring of deformation/crack width of concrete specimens [30].…”

“…Nowadays, PIV has been used in the field of concrete/ composites also, in order to measure displacement and strain fields [26][27][28][29] and monitoring fracture process zones (FPZs) and cracks [12,30]. Pioneering research done on the subject reveals the potential of this technique for precise and easy measuring of deformation/crack width of concrete specimens [30]. However, the number of studies on the application of this technique for crack monitoring of cement-based materials is still limited.…”

Strain and deflection analysis in plain concrete beams and reinforced concrete beams by applying digital image correlation

“…A clear example of the new techniques is the speed particle image, which is based on evaluating the displacement and strain fields on analyzing successive images under deformation, the great advantage of this technique is that it allows evaluating the whole field deformation of the object (Hosseini et al, 2014 ABSTRACT: Throughout history invasive methods for analyzing deflections and deformations have been used in concrete structures at the laboratory, but the advancement of technology has allowed the development of new non-invasive alternative methods such as digital image correlation (DIC). With this technique, it is possible to obtain information about the deflections, strains and strain fields in a structure.…”