Abstract
In this paper, three-point bending tests were carried out o investigate the post-peak cyclic loading behavior of dam concrete under two loading rates. The fracture parameters, residual load capacity, cyclic modulus, dissipated energy, and deformation recovery were presented and analyzed. The analysis was made to understand the evolution of fracture process zone (FPZ) under post-peak cyclic loading for dam concrete by utilizing digital image correlation (DIC) technique. The results showed while the dam concrete under a higher loading rate showed an increase in maximum load, it is not necessarily the same for post-peak bearing capacity. The specimens with higher post-peak bearing capacity had higher residual stiffness, higher dissipation energy, and higher Crack Mouth Opening Displacement (CMOD) reversibility under cyclic loading. The FPZ development was investigated quantitatively, and the extension and retraction of its tip were observed. Moreover, it was found that the FPZ in specimens with higher residual stiffness developed more slowly, and FPZ had a more significant retraction rate during unloading for the specimens with higher residual bearing capacity.
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Abbreviations
- a :
-
Crack length
- a 0 :
-
Initial crack length
- a c :
-
Critical crack length
- CMOD 0 :
-
CMOD at the reloading beginning
- CMOD c :
-
CMOD at the maximum load
- CMOD max :
-
CMOD at the peak load
- CMOD residual :
-
CMOD at the end of unloading
- E 0 :
-
Tangent modulus at the beginning
- E l :
-
Secant modulus of the loading process
- E l,50 :
-
Tangent modulus at 50% loading stage
- E unl :
-
Secant modulus of the unloading process
- E unl,50 :
-
Tangent modulus at 50% unloading stage
- exx :
-
Horizontal strain
- h :
-
The height of the beam
- K ini :
-
Initial fracture toughness
- K un :
-
Critical fracture toughness
- P u :
-
The maximum load
- S :
-
The span of the beam
- T :
-
Strain threshold
- t :
-
The thickness of the beam
- W i :
-
The dissipated energy of the i-th loading cycle
- α :
-
Crack height ratio
- β :
-
Span-height ratio
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Acknowledgments
The research is based upon the work supported by the Natural Science Foundation for Excellent Young Scholars of Jiangsu Province (Grant No. BK20190075); National Natural Science Foundation of China (Grant No. 51979090); Young Elite Scientists Sponsorship Program by China Association for Science and Technology (Grant No. 2017QNRC00).
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Chen, X., Li, S. & Cheng, X. Experimental Study of Evolution of Fracture Process Zone in Dam Concrete under Cyclic Loading Using Digital Image Correlation. KSCE J Civ Eng 26, 727–740 (2022). https://doi.org/10.1007/s12205-021-1835-6
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DOI: https://doi.org/10.1007/s12205-021-1835-6