Issue 68

K. W. Nindhita et alii, Frattura ed Integrità Strutturale, 68 (2024) 140-158; DOI: 10.3221/IGF-ESIS.68.09

Figure 17: Concrete stiffness test results.

Reinforced concrete failure pattern Flexure testing on concrete beams will result in cracks and deflection of the concrete. This is due to the pressure from the test load given by the concrete beam bending testing machine. Spread pattern and crack direction are used to determine the type of failure pattern on the beam. The process of determining the failure pattern is done by visual observation. From observations, all beam specimens were found to have a failure pattern by developing a macroscopic crack in the shear. The crack starts with the formation of a diagonal crack that penetrates through the specimen height. As the pressure load increased, the cracks propagated vertically from the bottom of the beam specimen to indicate tensile fracture under flexure [14]. Continuous load to the beam resulted in the start of steel reinforcement yielding, causing beam failure localization to form macro-cracks [45]. In this case, the ratio between the span length and height of the concrete beam is 520/150 or 3.47, so the concrete beam is predicted to be dominated by a shear failure pattern. The concrete beam failure pattern is shown in Figures 18 through 21.

(a)

(b) Figure 18: Failure pattern specimens (a) B1 and (b) B2.

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