Assessment of crack kinematics in concrete beams using digital image correlation

Assessment of crack kinematics in concrete beams using digital image correlation

Zarate Garnica, Gabriela (TU Delft Civil Engineering and Geosciences; TU Delft Engineering Structures)

Yang, Y. (mentor)
Hendriks, M.A.N. (graduation committee)

Delft University of Technology

Civil Engineering | Structural Engineering

2018-02-06

Digital Image Correlation analysis is performed to obtain measurements of the crack kinematics of four reinforced concrete beams without shear reinforcement. The results are used to implement the critical shear displacement theory. This new theory proposes that the opening of the critical inclined crack can be considered as a lower bound for the shear capacity. The unstable opening of the critical inclined crack is triggered when the shear displacement of an existing flexural crack reaches a critical value. Therefore, the critical shear displacement is used as a failure criterion.
The results indicate that digital image correlation is an adequate technique to obtain the refined crack kinematics since it permits to continuously track the evaluation of the crack even an instant before failure. This allows identifying the beginning of the opening of the critical inclined crack and the critical shear displacement value. A critical load representing the initiation of the irreversible damage is found and a crack width is linked to be applied in a proof load test.

Digital Image Correlation
Shear capacity
Critical Shear Displacement
Reinforced concrete beams

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Student theses

student report

© 2018 Gabriela Zarate Garnica