Title:
Experimental Study on Fracture Behavior of Dam Concrete under Cyclic Loading
Author(s):
Xudong Chen, Yuzhu Guo, and Shengtao Li
Publication:
Structural Journal
Volume:
118
Issue:
2
Appears on pages(s):
193-202
Keywords:
acoustic emission; dam concrete; dynamic load; fracture mechanism
DOI:
10.14359/51729346
Date:
3/1/2021
Abstract:
To study the fracture behavior of dam concrete subjected to elevated-amplitude cyclic loading, the three-point bending test was
carried out. During the loading process, the internal acoustic emission (AE) signal and surface cracks of dam concrete beams under cyclic loading were recorded using three-dimensional digital image correlation (3-D DIC) technique. The results show that with the increase of loading rate, AE events are concentrated near the peak load. There is a safe range of the historical index and signal intensity before failure of concrete. The analysis of load-crack mouth
opening displacement (CMOD) curves shows a rate effect on the stiffness attenuation. In addition, the crack propagation mechanism under different load rates and the relationship between crack tip opening displacement (CTOD) and CMOD under different elevated-amplitudes of load are analyzed.
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