Real-Time Image Analyzing System for Loading Tests of Structural Concrete

Watanabe, Ken; Higashi, Hironori; Miki, Tsuneharu; Niwa, Junichiro

doi:10.2208/jsceje.66.94

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…As a result, u and β can be calculated. Watanabe et al 18) concluded that there was less than 0.03 mm in gap between the displacement measured from π gauge and from the image analysis. This variation was insignificant.…”

Section: (4) Measurementsmentioning

confidence: 98%

Shear Capacity of Fiber Reinforced Concrete Beams With Various Types and Combinations of Fibers

2013

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This paper presents an investigation of the shear carried by fibers of fiber reinforced concrete (FRC) beams consisting of various types and combinations of fibers, and a proposal of the predictive equation for their shear capacity. Eight FRC beams with stirrups were tested by four-point bending. The testing program employed five fiber types (30-mm steel, 60-mm steel, polypropylene, polyvinyl alcohol and polyethylene terephthalate) and three combinations of hybrid fibers. The stress transferred across a diagonal crack was investigated using crack surface displacement and tension softening curve. The stress was significantly affected by the material types and combinations of fibers. The stress and the angle of the diagonal crack increased with the increase in fracture energy, whereas the diagonal crack length decreased. On the other hand, the angle of principal tensile strain did not significantly vary in the range of study. The shear carried by fibers was investigated from the stress and area of the crack surface. Good correlation between test results and calculated results was observed. In addition, a simplified equation of shear carried by fibers, involving fracture energy, stirrup ratio and effective depth, was formulated. Finally, a predictive equation for shear capacity of FRC beams was proposed and validated with 43 FRC beams. The proposed equation gave good prediction for FRC beams with various types and combinations of fibers.

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Section: (4) Measurementsmentioning

confidence: 98%

Shear Capacity of Fiber Reinforced Concrete Beams With Various Types and Combinations of Fibers

2013

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“…However, it is difficult to apply the neutron diffraction technique to the measurement of strain in concrete since high background noise scattering from hydrogen within the concrete makes diffraction measurements in concrete difficult. Alternatively, image analysis techniques such as a lattice method [4] and digital image correlation (DIC) [5], are commonly utilized for evaluating deformation of concrete quantitatively. They can assess concrete surface deformation by analyzing image contrast or marker displacement taken by a high resolution camera.…”

Section: Introductionmentioning

confidence: 99%