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http://dx.doi.org/10.12989/acc.2022.13.2.199

Behavior of F shape non-persistent joint under experimental and numerical uniaxial compression test  

Sarfarazi, Vahab (Department of Mining Engineering, Hamedan University of Technology)
Asgari, Kaveh (Department of Mining Engineering, Hamedan University of Technology)
Zarei, Meisam (Department of Mining Engineering, Hamedan University of Technology)
Ghalam, Erfan Zarrin (Department of Mining Engineering, Hamedan University of Technology)
Publication Information
Advances in concrete construction / v.13, no.2, 2022 , pp. 199-213 More about this Journal
Abstract
Experimental and discrete element approaches were used to examine the effects of F shape non-persistent joints on the failure behaviour of concrete under uniaxial compressive test. concrete specimens with dimensions of 200 cm×200 cm×50 cm were provided. Within the specimen, F shape non-persistent joint consisting three joints were provided. The large joint length was 6 cm, and the length of two small joints were 2 cm. Vertical distance between two small joints change from 1.5 cm to 4.5 cm with increment of 1.5 cm. In constant joint lengths, the angle of large joint change from 0° to 90° with increments of 30°. Totally 12 different models were tested under compression test. The axial load rate on the model was 0.05 mm/min. Concurrent with experimental tests, numerical simulation (Particle flow code in two dimension) were performed on the models containing F shape non-persistent joint. Distance between small joints and joint angles were similar to experimental one. the results indicated that the failure process was mostly governed by both of the Distance between small joints and joint angles. The axial loading rate on the model was 0.05 mm/min. The compressive strengths of the samples were related to the fracture pattern and failure mechanism of the discontinuities. Furthermore, it was shown that the compressive behaviour of discontinuities is related to the number of the induced tensile cracks which are increased by increasing the joint angle. In the first, there were only a few acoustic emission (AE) hits in the initial stage of loading, and then AE hits rapidly grow before the applied stress reached its peak. Furthermore, a large number of AE hits accompanied every stress drop. Finally, the failure pattern and failure strength are similar in both approaches i.e., the experimental testing and the numerical simulation approaches.
Keywords
F shape non-persistent joint; PFC2D; physical test;
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